- Heavy refactoring to integrate extensions better with the rest of the compiler.

53 files changed, 1172 insertions, 1260 deletions

diff --git a/stdlib/source/lux/lang.lux b/stdlib/source/lux/lang.lux
index 322b9f655..bc6e2c9ec 100644
--- a/stdlib/source/lux/lang.lux
+++ b/stdlib/source/lux/lang.lux
@@ -1,17 +1,5 @@
 (.module:
-  lux
-  (lux (control [monad #+ do]
-                ["ex" exception #+ exception:])
-       (data [product]
-             ["e" error]
-             [text "text/" Eq<Text>]
-             text/format)
-       [macro]
-       (macro ["s" syntax #+ syntax:])))
-
-(type: #export (Extension e)
-  {#name Text
-   #parameters (List e)})
+  lux)
 
 (type: #export Eval
   (-> Type Code (Meta Any)))
@@ -19,101 +7,3 @@
 (type: #export Version Text)
 
 (def: #export version Version "0.6.0")
-
-(def: #export (fail message)
-  (All [a] (-> Text (Meta a)))
-  (do macro.Monad<Meta>
-    [[file line col] macro.cursor
-     #let [location (format file
-                            "," (|> line .int %i)
-                            "," (|> col .int %i))]]
-    (macro.fail (format message "\n\n"
-                        "@ " location))))
-
-(def: #export (throw exception message)
-  (All [e a] (-> (ex.Exception e) e (Meta a)))
-  (fail (ex.construct exception message)))
-
-(syntax: #export (assert exception message test)
-  (wrap (list (` (if (~ test)
-                   (:: macro.Monad<Meta> (~' wrap) [])
-                   (..throw (~ exception) (~ message)))))))
-
-(def: #export (with-source-code source action)
-  (All [a] (-> Source (Meta a) (Meta a)))
-  (function (_ compiler)
-    (let [old-source (get@ #.source compiler)]
-      (case (action (set@ #.source source compiler))
-        (#e.Error error)
-        (#e.Error error)
-
-        (#e.Success [compiler' output])
-        (#e.Success [(set@ #.source old-source compiler')
-                     output])))))
-
-(def: #export (with-stacked-errors handler action)
-  (All [a] (-> (-> [] Text) (Meta a) (Meta a)))
-  (function (_ compiler)
-    (case (action compiler)
-      (#e.Success [compiler' output])
-      (#e.Success [compiler' output])
-
-      (#e.Error error)
-      (#e.Error (if (text/= "" error)
-                  (handler [])
-                  (format (handler []) "\n\n-----------------------------------------\n\n" error))))))
-
-(def: fresh-bindings
-  (All [k v] (Bindings k v))
-  {#.counter +0
-   #.mappings (list)})
-
-(def: fresh-scope
-  Scope
-  {#.name     (list)
-   #.inner    +0
-   #.locals   fresh-bindings
-   #.captured fresh-bindings})
-
-(def: #export (with-scope action)
-  (All [a] (-> (Meta a) (Meta [Scope a])))
-  (function (_ compiler)
-    (case (action (update@ #.scopes (|>> (#.Cons fresh-scope)) compiler))
-      (#e.Success [compiler' output])
-      (case (get@ #.scopes compiler')
-        #.Nil
-        (#e.Error "Impossible error: Drained scopes!")
-
-        (#.Cons head tail)
-        (#e.Success [(set@ #.scopes tail compiler')
-                     [head output]]))
-
-      (#e.Error error)
-      (#e.Error error))))
-
-(def: #export (with-current-module name action)
-  (All [a] (-> Text (Meta a) (Meta a)))
-  (function (_ compiler)
-    (case (action (set@ #.current-module (#.Some name) compiler))
-      (#e.Success [compiler' output])
-      (#e.Success [(set@ #.current-module
-                         (get@ #.current-module compiler)
-                         compiler')
-                   output])
-
-      (#e.Error error)
-      (#e.Error error))))
-
-(def: #export (with-cursor cursor action)
-  (All [a] (-> Cursor (Meta a) (Meta a)))
-  (if (text/= "" (product.left cursor))
-    action
-    (function (_ compiler)
-      (let [old-cursor (get@ #.cursor compiler)]
-        (case (action (set@ #.cursor cursor compiler))
-          (#e.Success [compiler' output])
-          (#e.Success [(set@ #.cursor old-cursor compiler')
-                       output])
-
-          (#e.Error error)
-          (#e.Error error))))))
diff --git a/stdlib/source/lux/lang/analysis/expression.lux b/stdlib/source/lux/lang/analysis/expression.lux
deleted file mode 100644
index 325394e73..000000000
--- a/stdlib/source/lux/lang/analysis/expression.lux
+++ /dev/null
@@ -1,122 +0,0 @@
-(.module:
-  lux
-  (lux (control [monad #+ do]
-                ["ex" exception #+ exception:])
-       (data ["e" error]
-             [product]
-             text/format)
-       [macro]
-       [lang #+ Eval]
-       (lang [type]
-             (type ["tc" check])
-             [".L" analysis #+ Analysis Analyser]
-             (analysis [".A" type]
-                       [".A" primitive]
-                       [".A" structure]
-                       [".A" reference])
-             ## [".L" macro]
-             [".L" extension])))
-
-(exception: #export (macro-expansion-failed {message Text})
-  message)
-
-(do-template [<name>]
-  [(exception: #export (<name> {code Code})
-     (%code code))]
-
-  [macro-call-must-have-single-expansion]
-  [unrecognized-syntax]
-  )
-
-(def: #export (analyser eval)
-  (-> Eval Analyser)
-  (: (-> Code (Meta Analysis))
-     (function (analyse code)
-       (do macro.Monad<Meta>
-         [expectedT macro.expected-type]
-         (let [[cursor code'] code]
-           ## The cursor must be set in the compiler for the sake
-           ## of having useful error messages.
-           (lang.with-cursor cursor
-             (case code'
-               (^template [<tag> <analyser>]
-                 (<tag> value)
-                 (<analyser> value))
-               ([#.Bool primitiveA.bool]
-                [#.Nat  primitiveA.nat]
-                [#.Int  primitiveA.int]
-                [#.Deg  primitiveA.deg]
-                [#.Frac primitiveA.frac]
-                [#.Text primitiveA.text])
-
-               (^template [<tag> <analyser>]
-                 (^ (#.Form (list& [_ (<tag> tag)]
-                                   values)))
-                 (case values
-                   (#.Cons value #.Nil)
-                   (<analyser> analyse tag value)
-
-                   _
-                   (<analyser> analyse tag (` [(~+ values)]))))
-               ([#.Nat structureA.sum]
-                [#.Tag structureA.tagged-sum])
-
-               (#.Tag tag)
-               (structureA.tagged-sum analyse tag (' []))
-
-               (^ (#.Tuple (list)))
-               primitiveA.unit
-
-               (^ (#.Tuple (list singleton)))
-               (analyse singleton)
-
-               (^ (#.Tuple elems))
-               (structureA.product analyse elems)
-
-               (^ (#.Record pairs))
-               (structureA.record analyse pairs)
-
-               (#.Symbol reference)
-               (referenceA.reference reference)
-
-               (^ (#.Form (list& [_ (#.Text proc-name)] proc-args)))
-               (do macro.Monad<Meta>
-                 [procedure (extensionL.find-analysis proc-name)]
-                 (procedure analyse eval proc-args))
-
-               ## (^ (#.Form (list& func args)))
-               ## (do macro.Monad<Meta>
-               ##   [[funcT funcA] (typeA.with-inference
-               ##                    (analyse func))]
-               ##   (case funcA
-               ##     [_ (#.Symbol def-name)]
-               ##     (do @
-               ##       [?macro (lang.with-error-tracking
-               ##                 (macro.find-macro def-name))]
-               ##       (case ?macro
-               ##         (#.Some macro)
-               ##         (do @
-               ##           [expansion (: (Meta (List Code))
-               ##                         (function (_ compiler)
-               ##                           (case (macroL.expand macro args compiler)
-               ##                             (#e.Error error)
-               ##                             ((lang.throw macro-expansion-failed error) compiler)
-
-               ##                             output
-               ##                             output)))]
-               ##           (case expansion
-               ##             (^ (list single))
-               ##             (analyse single)
-
-               ##             _
-               ##             (lang.throw macro-call-must-have-single-expansion code)))
-
-               ##         _
-               ##         (functionA.analyse-apply analyse funcT funcA args)))
-
-               ##     _
-               ##     (functionA.analyse-apply analyse funcT funcA args)))
-
-               _
-               (lang.throw unrecognized-syntax code)
-               )))))))
diff --git a/stdlib/source/lux/lang/compiler.lux b/stdlib/source/lux/lang/compiler.lux
index c2f9af1e2..20278a6cd 100644
--- a/stdlib/source/lux/lang/compiler.lux
+++ b/stdlib/source/lux/lang/compiler.lux
@@ -4,12 +4,21 @@
                 ["ex" exception #+ Exception exception:]
                 [monad #+ do])
        (data [product]
-             [error #+ Error])
-       [function]))
+             [error #+ Error]
+             [text]
+             text/format)
+       [function]
+       (macro ["s" syntax #+ syntax:])))
 
 (type: #export (Operation s o)
   (state.State' Error s o))
 
+(def: #export Monad<Operation>
+  (state.Monad<State'> error.Monad<Error>))
+
+(type: #export (Compiler s i o)
+  (-> i (Operation s o)))
+
 (def: #export (run state operation)
   (All [s o]
     (-> s (Operation s o) (Error o)))
@@ -17,11 +26,20 @@
       operation
       (:: error.Monad<Error> map product.right)))
 
+(def: #export fail
+  (-> Text Operation)
+  (|>> error.fail (state.lift error.Monad<Error>)))
+
 (def: #export (throw exception parameters)
   (All [e] (-> (Exception e) e Operation))
   (state.lift error.Monad<Error>
               (ex.throw exception parameters)))
 
+(syntax: #export (assert exception message test)
+  (wrap (list (` (if (~ test)
+                   (:: ..Monad<Operation> (~' wrap) [])
+                   (..throw (~ exception) (~ message)))))))
+
 (def: #export (localized transform)
   (All [s o]
     (-> (-> s s)
@@ -39,8 +57,35 @@
   (All [s o] (-> s (-> (Operation s o) (Operation s o))))
   (localized (function.constant state)))
 
-(def: #export Monad<Operation>
-  (state.Monad<State'> error.Monad<Error>))
+(def: error-separator
+  (format "\n\n"
+          "-----------------------------------------"
+          "\n\n"))
 
-(type: #export (Compiler s i o)
-  (-> i (Operation s o)))
+(def: #export (with-stacked-errors handler action)
+  (All [s o] (-> (-> [] Text) (Operation s o) (Operation s o)))
+  (function (_ state)
+    (case (action state)
+      (#error.Error error)
+      (#error.Error (if (text.empty? error)
+                      (handler [])
+                      (format (handler []) error-separator error)))
+
+      success
+      success)))
+
+(def: #export identity
+  (All [s a] (Compiler s a a))
+  (function (_ input state)
+    (#error.Success [state input])))
+
+(def: #export (compose pre post)
+  (All [s0 s1 i t o]
+    (-> (Compiler s0 i t)
+        (Compiler s1 t o)
+        (Compiler [s0 s1] i o)))
+  (function (_ input [pre/state post/state])
+    (do error.Monad<Error>
+      [[pre/state' temp] (pre input pre/state)
+       [post/state' output] (post temp post/state)]
+      (wrap [[pre/state' post/state'] output]))))
diff --git a/stdlib/source/lux/lang/analysis.lux b/stdlib/source/lux/lang/compiler/analysis.lux
index 6efa934d8..235e399fb 100644
--- a/stdlib/source/lux/lang/analysis.lux
+++ b/stdlib/source/lux/lang/compiler/analysis.lux
@@ -1,9 +1,12 @@
 (.module:
   [lux #- nat int deg]
-  (lux [function]
-       (data (coll [list "list/" Fold<List>])))
-  [// #+ Extension]
-  [//reference #+ Register Variable Reference])
+  (lux (data [product]
+             [error]
+             [text "text/" Eq<Text>]
+             (coll [list "list/" Fold<List>]))
+       [function])
+  [///reference #+ Register Variable Reference]
+  [//])
 
 (type: #export #rec Primitive
   #Unit
@@ -41,8 +44,13 @@
   (#Reference Reference)
   (#Case Analysis (Match' Analysis))
   (#Function Environment Analysis)
-  (#Apply Analysis Analysis)
-  (#Extension (Extension Analysis)))
+  (#Apply Analysis Analysis))
+
+(type: #export Operation
+  (//.Operation .Lux))
+
+(type: #export Compiler
+  (//.Compiler .Lux Code Analysis))
 
 (type: #export Branch
   (Branch' Analysis))
@@ -88,7 +96,7 @@
   (n/= (dec size) tag))
 
 (template: #export (no-op value)
-  (|> +1 #//reference.Local #//reference.Variable #..Reference
+  (|> +1 #///reference.Local #///reference.Variable #..Reference
       (#..Function (list))
       (#..Apply value)))
 
@@ -138,9 +146,6 @@
   (-> (Application Analysis) Analysis)
   (list/fold (function (_ arg func) (#Apply arg func)) func args))
 
-(type: #export Analyser
-  (-> Code (Meta Analysis)))
-
 (do-template [<name> <type> <tag>]
   [(def: #export (<name> value)
      (-> <type> (Tuple <type>))
@@ -207,3 +212,70 @@
   [pattern/frac #..Frac]
   [pattern/text #..Text]
   )
+
+(def: #export (with-source-code source action)
+  (All [a] (-> Source (Operation a) (Operation a)))
+  (function (_ compiler)
+    (let [old-source (get@ #.source compiler)]
+      (case (action (set@ #.source source compiler))
+        (#error.Error error)
+        (#error.Error error)
+
+        (#error.Success [compiler' output])
+        (#error.Success [(set@ #.source old-source compiler')
+                         output])))))
+
+(def: fresh-bindings
+  (All [k v] (Bindings k v))
+  {#.counter +0
+   #.mappings (list)})
+
+(def: fresh-scope
+  Scope
+  {#.name     (list)
+   #.inner    +0
+   #.locals   fresh-bindings
+   #.captured fresh-bindings})
+
+(def: #export (with-scope action)
+  (All [a] (-> (Operation a) (Operation [Scope a])))
+  (function (_ compiler)
+    (case (action (update@ #.scopes (|>> (#.Cons fresh-scope)) compiler))
+      (#error.Success [compiler' output])
+      (case (get@ #.scopes compiler')
+        #.Nil
+        (#error.Error "Impossible error: Drained scopes!")
+
+        (#.Cons head tail)
+        (#error.Success [(set@ #.scopes tail compiler')
+                         [head output]]))
+
+      (#error.Error error)
+      (#error.Error error))))
+
+(def: #export (with-current-module name action)
+  (All [a] (-> Text (Operation a) (Operation a)))
+  (function (_ compiler)
+    (case (action (set@ #.current-module (#.Some name) compiler))
+      (#error.Success [compiler' output])
+      (#error.Success [(set@ #.current-module
+                             (get@ #.current-module compiler)
+                             compiler')
+                       output])
+
+      (#error.Error error)
+      (#error.Error error))))
+
+(def: #export (with-cursor cursor action)
+  (All [a] (-> Cursor (Operation a) (Operation a)))
+  (if (text/= "" (product.left cursor))
+    action
+    (function (_ compiler)
+      (let [old-cursor (get@ #.cursor compiler)]
+        (case (action (set@ #.cursor cursor compiler))
+          (#error.Success [compiler' output])
+          (#error.Success [(set@ #.cursor old-cursor compiler')
+                           output])
+
+          (#error.Error error)
+          (#error.Error error))))))
diff --git a/stdlib/source/lux/lang/analysis/case.lux b/stdlib/source/lux/lang/compiler/analysis/case.lux
index 744d3cf24..9e67a24f9 100644
--- a/stdlib/source/lux/lang/analysis/case.lux
+++ b/stdlib/source/lux/lang/compiler/analysis/case.lux
@@ -1,27 +1,22 @@
 (.module:
   [lux #- case]
   (lux (control [monad #+ do]
-                ["ex" exception #+ exception:]
-                [equality #+ Eq])
-       (data [bool]
-             [number]
-             [product]
-             ["e" error]
+                ["ex" exception #+ exception:])
+       (data [product]
+             [error]
              [maybe]
-             [text]
              text/format
              (coll [list "list/" Fold<List> Monoid<List> Functor<List>]))
-       [function]
        [macro]
-       (macro [code])
-       [lang]
-       (lang [type]
-             (type ["tc" check])
-             [".L" scope]
-             [".L" analysis #+ Pattern Analysis Analyser]
-             (analysis [".A" type]
-                       [".A" structure]
-                       (case [".A" coverage])))))
+       (macro [code]))
+  (//// [type]
+        (type ["tc" check])
+        [scope])
+  [///]
+  [// #+ Pattern Analysis Operation Compiler]
+  [//type]
+  [//structure]
+  [/coverage])
 
 (exception: #export (cannot-match-type-with-pattern {type Type} {pattern Code})
   (ex.report ["Type" (%type type)]
@@ -62,21 +57,21 @@
 ## This function makes it easier for "case" analysis to properly
 ## type-check the input with respect to the patterns.
 (def: (simplify-case-type caseT)
-  (-> Type (Meta Type))
+  (-> Type (Operation Type))
   (loop [envs (: (List (List Type))
                  (list))
          caseT caseT]
     (.case caseT
       (#.Var id)
-      (do macro.Monad<Meta>
-        [?caseT' (typeA.with-env
+      (do ///.Monad<Operation>
+        [?caseT' (//type.with-env
                    (tc.read id))]
         (.case ?caseT'
           (#.Some caseT')
           (recur envs caseT')
 
           _
-          (lang.throw cannot-simplify-type-for-pattern-matching caseT)))
+          (///.throw cannot-simplify-type-for-pattern-matching caseT)))
 
       (#.Named name unnamedT)
       (recur envs unnamedT)
@@ -85,16 +80,16 @@
       (recur (#.Cons env envs) unquantifiedT)
 
       (#.ExQ _)
-      (do macro.Monad<Meta>
-        [[ex-id exT] (typeA.with-env
+      (do ///.Monad<Operation>
+        [[ex-id exT] (//type.with-env
                        tc.existential)]
         (recur envs (maybe.assume (type.apply (list exT) caseT))))
 
       (#.Apply inputT funcT)
       (.case funcT
         (#.Var funcT-id)
-        (do macro.Monad<Meta>
-          [funcT' (typeA.with-env
+        (do ///.Monad<Operation>
+          [funcT' (//type.with-env
                     (do tc.Monad<Check>
                       [?funct' (tc.read funcT-id)]
                       (.case ?funct'
@@ -111,23 +106,23 @@
           (recur envs outputT)
 
           #.None
-          (lang.throw cannot-simplify-type-for-pattern-matching caseT)))
+          (///.throw cannot-simplify-type-for-pattern-matching caseT)))
 
       (#.Product _)
       (|> caseT
           type.flatten-tuple
           (list/map (re-quantify envs))
           type.tuple
-          (:: macro.Monad<Meta> wrap))
+          (:: ///.Monad<Operation> wrap))
 
       _
-      (:: macro.Monad<Meta> wrap (re-quantify envs caseT)))))
+      (:: ///.Monad<Operation> wrap (re-quantify envs caseT)))))
 
 (def: (analyse-primitive type inputT cursor output next)
-  (All [a] (-> Type Type Cursor Pattern (Meta a) (Meta [Pattern a])))
-  (lang.with-cursor cursor
-    (do macro.Monad<Meta>
-      [_ (typeA.with-env
+  (All [a] (-> Type Type Cursor Pattern (Operation a) (Operation [Pattern a])))
+  (//.with-cursor cursor
+    (do ///.Monad<Operation>
+      [_ (//type.with-env
            (tc.check inputT type))
        outputA next]
       (wrap [output outputA]))))
@@ -149,33 +144,33 @@
 ## That is why the body must be analysed in the context of the
 ## pattern, and not separately.
 (def: (analyse-pattern num-tags inputT pattern next)
-  (All [a] (-> (Maybe Nat) Type Code (Meta a) (Meta [Pattern a])))
+  (All [a] (-> (Maybe Nat) Type Code (Operation a) (Operation [Pattern a])))
   (.case pattern
     [cursor (#.Symbol ["" name])]
-    (lang.with-cursor cursor
-      (do macro.Monad<Meta>
-        [outputA (scopeL.with-local [name inputT]
+    (//.with-cursor cursor
+      (do ///.Monad<Operation>
+        [outputA (scope.with-local [name inputT]
                    next)
-         idx scopeL.next-local]
-        (wrap [(#analysisL.Bind idx) outputA])))
+         idx scope.next-local]
+        (wrap [(#//.Bind idx) outputA])))
 
     (^template [<type> <input> <output>]
       [cursor <input>]
-      (analyse-primitive <type> inputT cursor (#analysisL.Simple <output>) next))
-    ([Bool (#.Bool pattern-value) (#analysisL.Bool pattern-value)]
-     [Nat  (#.Nat pattern-value)  (#analysisL.Nat pattern-value)]
-     [Int  (#.Int pattern-value)  (#analysisL.Int pattern-value)]
-     [Deg  (#.Deg pattern-value)  (#analysisL.Deg pattern-value)]
-     [Frac (#.Frac pattern-value) (#analysisL.Frac pattern-value)]
-     [Text (#.Text pattern-value) (#analysisL.Text pattern-value)]
-     [Any  (#.Tuple #.Nil)        #analysisL.Unit])
+      (analyse-primitive <type> inputT cursor (#//.Simple <output>) next))
+    ([Bool (#.Bool pattern-value) (#//.Bool pattern-value)]
+     [Nat  (#.Nat pattern-value)  (#//.Nat pattern-value)]
+     [Int  (#.Int pattern-value)  (#//.Int pattern-value)]
+     [Deg  (#.Deg pattern-value)  (#//.Deg pattern-value)]
+     [Frac (#.Frac pattern-value) (#//.Frac pattern-value)]
+     [Text (#.Text pattern-value) (#//.Text pattern-value)]
+     [Any  (#.Tuple #.Nil)        #//.Unit])
     
     (^ [cursor (#.Tuple (list singleton))])
     (analyse-pattern #.None inputT singleton next)
     
     [cursor (#.Tuple sub-patterns)]
-    (lang.with-cursor cursor
-      (do macro.Monad<Meta>
+    (//.with-cursor cursor
+      (do ///.Monad<Operation>
         [inputT' (simplify-case-type inputT)]
         (.case inputT'
           (#.Product _)
@@ -195,11 +190,11 @@
                               (list.zip2 sub-types sub-patterns))]
             (do @
               [[memberP+ thenA] (list/fold (: (All [a]
-                                                (-> [Type Code] (Meta [(List Pattern) a])
-                                                    (Meta [(List Pattern) a])))
+                                                (-> [Type Code] (Operation [(List Pattern) a])
+                                                    (Operation [(List Pattern) a])))
                                               (function (_ [memberT memberC] then)
                                                 (do @
-                                                  [[memberP [memberP+ thenA]] ((:! (All [a] (-> (Maybe Nat) Type Code (Meta a) (Meta [Pattern a])))
+                                                  [[memberP [memberP+ thenA]] ((:! (All [a] (-> (Maybe Nat) Type Code (Operation a) (Operation [Pattern a])))
                                                                                    analyse-pattern)
                                                                                #.None memberT memberC then)]
                                                   (wrap [(list& memberP memberP+) thenA]))))
@@ -207,28 +202,28 @@
                                              [nextA next]
                                              (wrap [(list) nextA]))
                                            (list.reverse matches))]
-              (wrap [(analysisL.product-pattern memberP+)
+              (wrap [(//.product-pattern memberP+)
                      thenA])))
 
           _
-          (lang.throw cannot-match-type-with-pattern [inputT pattern])
+          (///.throw cannot-match-type-with-pattern [inputT pattern])
           )))
 
     [cursor (#.Record record)]
-    (do macro.Monad<Meta>
-      [record (structureA.normalize record)
-       [members recordT] (structureA.order record)
-       _ (typeA.with-env
+    (do ///.Monad<Operation>
+      [record (//structure.normalize record)
+       [members recordT] (//structure.order record)
+       _ (//type.with-env
            (tc.check inputT recordT))]
       (analyse-pattern (#.Some (list.size members)) inputT [cursor (#.Tuple members)] next))
 
     [cursor (#.Tag tag)]
-    (lang.with-cursor cursor
+    (//.with-cursor cursor
       (analyse-pattern #.None inputT (` ((~ pattern))) next))
 
     (^ [cursor (#.Form (list& [_ (#.Nat idx)] values))])
-    (lang.with-cursor cursor
-      (do macro.Monad<Meta>
+    (//.with-cursor cursor
+      (do ///.Monad<Operation>
         [inputT' (simplify-case-type inputT)]
         (.case inputT'
           (#.Sum _)
@@ -238,7 +233,7 @@
             (.case (list.nth idx flat-sum)
               (^multi (#.Some case-type)
                       (n/< num-cases idx))
-              (do macro.Monad<Meta>
+              (do ///.Monad<Operation>
                 [[testP nextA] (if (and (n/> num-cases size-sum)
                                         (n/= (dec num-cases) idx))
                                  (analyse-pattern #.None
@@ -246,50 +241,50 @@
                                                   (` [(~+ values)])
                                                   next)
                                  (analyse-pattern #.None case-type (` [(~+ values)]) next))]
-                (wrap [(analysisL.sum-pattern num-cases idx testP)
+                (wrap [(//.sum-pattern num-cases idx testP)
                        nextA]))
 
               _
-              (lang.throw sum-type-has-no-case [idx inputT])))
+              (///.throw sum-type-has-no-case [idx inputT])))
 
           _
-          (lang.throw cannot-match-type-with-pattern [inputT pattern]))))
+          (///.throw cannot-match-type-with-pattern [inputT pattern]))))
 
     (^ [cursor (#.Form (list& [_ (#.Tag tag)] values))])
-    (lang.with-cursor cursor
-      (do macro.Monad<Meta>
+    (//.with-cursor cursor
+      (do ///.Monad<Operation>
         [tag (macro.normalize tag)
          [idx group variantT] (macro.resolve-tag tag)
-         _ (typeA.with-env
+         _ (//type.with-env
              (tc.check inputT variantT))]
         (analyse-pattern (#.Some (list.size group)) inputT (` ((~ (code.nat idx)) (~+ values))) next)))
 
     _
-    (lang.throw unrecognized-pattern-syntax pattern)
+    (///.throw unrecognized-pattern-syntax pattern)
     ))
 
 (def: #export (case analyse inputC branches)
-  (-> Analyser Code (List [Code Code]) (Meta Analysis))
+  (-> Compiler Code (List [Code Code]) (Operation Analysis))
   (.case branches
     #.Nil
-    (lang.throw cannot-have-empty-branches "")
+    (///.throw cannot-have-empty-branches "")
 
     (#.Cons [patternH bodyH] branchesT)
-    (do macro.Monad<Meta>
-      [[inputT inputA] (typeA.with-inference
+    (do ///.Monad<Operation>
+      [[inputT inputA] (//type.with-inference
                          (analyse inputC))
        outputH (analyse-pattern #.None inputT patternH (analyse bodyH))
        outputT (monad.map @
                           (function (_ [patternT bodyT])
                             (analyse-pattern #.None inputT patternT (analyse bodyT)))
                           branchesT)
-       outputHC (|> outputH product.left coverageA.determine)
-       outputTC (monad.map @ (|>> product.left coverageA.determine) outputT)
-       _ (.case (monad.fold e.Monad<Error> coverageA.merge outputHC outputTC)
-           (#e.Success coverage)
-           (lang.assert non-exhaustive-pattern-matching ""
-                        (coverageA.exhaustive? coverage))
-
-           (#e.Error error)
-           (lang.fail error))]
-      (wrap (#analysisL.Case inputA [outputH outputT])))))
+       outputHC (|> outputH product.left /coverage.determine)
+       outputTC (monad.map @ (|>> product.left /coverage.determine) outputT)
+       _ (.case (monad.fold error.Monad<Error> /coverage.merge outputHC outputTC)
+           (#error.Success coverage)
+           (///.assert non-exhaustive-pattern-matching ""
+                       (/coverage.exhaustive? coverage))
+
+           (#error.Error error)
+           (///.fail error))]
+      (wrap (#//.Case inputA [outputH outputT])))))
diff --git a/stdlib/source/lux/lang/analysis/case/coverage.lux b/stdlib/source/lux/lang/compiler/analysis/case/coverage.lux
index a5958001f..6a965742a 100644
--- a/stdlib/source/lux/lang/analysis/case/coverage.lux
+++ b/stdlib/source/lux/lang/compiler/analysis/case/coverage.lux
@@ -9,10 +9,9 @@
              [maybe]
              text/format
              (coll [list "list/" Fold<List>]
-                   (dictionary ["dict" unordered #+ Dict])))
-       [macro "macro/" Monad<Meta>]
-       [lang]
-       (lang [".L" analysis #+ Pattern Variant])))
+                   (dictionary ["dict" unordered #+ Dict]))))
+  [//// "operation/" Monad<Operation>]
+  [/// #+ Pattern Variant Operation])
 
 (def: cases
   (-> (Maybe Nat) Nat)
@@ -25,18 +24,18 @@
     (case variantP
       (#.Left valueP)
       (case valueP
-        (#analysisL.Complex (#analysisL.Sum value-side))
+        (#///.Complex (#///.Sum value-side))
         (recur (inc lefts) value-side)
 
         _
-        {#analysisL.lefts lefts
-         #analysisL.right? false
-         #analysisL.value valueP})
+        {#///.lefts lefts
+         #///.right? false
+         #///.value valueP})
       
       (#.Right valueP)
-      {#analysisL.lefts lefts
-       #analysisL.right? true
-       #analysisL.value valueP})))
+      {#///.lefts lefts
+       #///.right? true
+       #///.value valueP})))
 
 ## The coverage of a pattern-matching expression summarizes how well
 ## all the possible values of an input are being covered by the
@@ -68,33 +67,33 @@
     false))
 
 (def: #export (determine pattern)
-  (-> Pattern (Meta Coverage))
+  (-> Pattern (Operation Coverage))
   (case pattern
-    (^or (#analysisL.Simple #analysisL.Unit)
-         (#analysisL.Bind _))
-    (macro/wrap #Exhaustive)
+    (^or (#///.Simple #///.Unit)
+         (#///.Bind _))
+    (operation/wrap #Exhaustive)
 
     ## Primitive patterns always have partial coverage because there
     ## are too many possibilities as far as values go.
     (^template [<tag>]
-      (#analysisL.Simple (<tag> _))
-      (macro/wrap #Partial))
-    ([#analysisL.Nat]
-     [#analysisL.Int]
-     [#analysisL.Deg]
-     [#analysisL.Frac]
-     [#analysisL.Text])
+      (#///.Simple (<tag> _))
+      (operation/wrap #Partial))
+    ([#///.Nat]
+     [#///.Int]
+     [#///.Deg]
+     [#///.Frac]
+     [#///.Text])
 
     ## Bools are the exception, since there is only "true" and
     ## "false", which means it is possible for boolean
     ## pattern-matching to become exhaustive if complementary parts meet.
-    (#analysisL.Simple (#analysisL.Bool value))
-    (macro/wrap (#Bool value))
+    (#///.Simple (#///.Bool value))
+    (operation/wrap (#Bool value))
 
     ## Tuple patterns can be exhaustive if there is exhaustiveness for all of
     ## their sub-patterns.
-    (#analysisL.Complex (#analysisL.Product [left right]))
-    (do macro.Monad<Meta>
+    (#///.Complex (#///.Product [left right]))
+    (do ////.Monad<Operation>
       [left (determine left)
        right (determine right)]
       (case right
@@ -104,11 +103,11 @@
         _
         (wrap (#Seq left right))))
 
-    (#analysisL.Complex (#analysisL.Sum sum-side))
+    (#///.Complex (#///.Sum sum-side))
     (let [[variant-lefts variant-right? variant-value] (variant sum-side)]
       ## Variant patterns can be shown to be exhaustive if all the possible
       ## cases are handled exhaustively.
-      (do macro.Monad<Meta>
+      (do ////.Monad<Operation>
         [value-coverage (determine variant-value)
          #let [variant-idx (if variant-right?
                              (inc variant-lefts)
diff --git a/stdlib/source/lux/lang/compiler/analysis/expression.lux b/stdlib/source/lux/lang/compiler/analysis/expression.lux
new file mode 100644
index 000000000..879f383e8
--- /dev/null
+++ b/stdlib/source/lux/lang/compiler/analysis/expression.lux
@@ -0,0 +1,121 @@
+(.module:
+  lux
+  (lux (control [monad #+ do]
+                ["ex" exception #+ exception:])
+       (data ["e" error]
+             [product]
+             text/format)
+       [macro])
+  [//// #+ Eval]
+  ## (//// [".L" macro]
+  ##       [".L" extension])
+  [///]
+  [// #+ Analysis Operation Compiler]
+  [//type]
+  [//primitive]
+  [//structure]
+  [//reference])
+
+(exception: #export (macro-expansion-failed {message Text})
+  message)
+
+(do-template [<name>]
+  [(exception: #export (<name> {code Code})
+     (%code code))]
+
+  [macro-call-must-have-single-expansion]
+  [unrecognized-syntax]
+  )
+
+(def: #export (analyser eval)
+  (-> Eval Compiler)
+  (function (compile code)
+    (do ///.Monad<Operation>
+      [expectedT macro.expected-type]
+      (let [[cursor code'] code]
+        ## The cursor must be set in the compiler for the sake
+        ## of having useful error messages.
+        (//.with-cursor cursor
+          (case code'
+            (^template [<tag> <analyser>]
+              (<tag> value)
+              (<analyser> value))
+            ([#.Bool //primitive.bool]
+             [#.Nat  //primitive.nat]
+             [#.Int  //primitive.int]
+             [#.Deg  //primitive.deg]
+             [#.Frac //primitive.frac]
+             [#.Text //primitive.text])
+
+            (^template [<tag> <analyser>]
+              (^ (#.Form (list& [_ (<tag> tag)]
+                                values)))
+              (case values
+                (#.Cons value #.Nil)
+                (<analyser> compile tag value)
+
+                _
+                (<analyser> compile tag (` [(~+ values)]))))
+            ([#.Nat //structure.sum]
+             [#.Tag //structure.tagged-sum])
+
+            (#.Tag tag)
+            (//structure.tagged-sum compile tag (' []))
+
+            (^ (#.Tuple (list)))
+            //primitive.unit
+
+            (^ (#.Tuple (list singleton)))
+            (compile singleton)
+
+            (^ (#.Tuple elems))
+            (//structure.product compile elems)
+
+            (^ (#.Record pairs))
+            (//structure.record compile pairs)
+
+            (#.Symbol reference)
+            (//reference.reference reference)
+
+            (^ (#.Form (list& [_ (#.Text extension-name)] extension-args)))
+            (undefined)
+            ## (do ///.Monad<Operation>
+            ##   [extension (extensionL.find-analysis extension-name)]
+            ##   (extension compile eval extension-args))
+
+            ## (^ (#.Form (list& func args)))
+            ## (do ///.Monad<Operation>
+            ##   [[funcT funcA] (//type.with-inference
+            ##                    (compile func))]
+            ##   (case funcA
+            ##     [_ (#.Symbol def-name)]
+            ##     (do @
+            ##       [?macro (///.with-error-tracking
+            ##                 (macro.find-macro def-name))]
+            ##       (case ?macro
+            ##         (#.Some macro)
+            ##         (do @
+            ##           [expansion (: (Operation (List Code))
+            ##                         (function (_ compiler)
+            ##                           (case (macroL.expand macro args compiler)
+            ##                             (#e.Error error)
+            ##                             ((///.throw macro-expansion-failed error) compiler)
+
+            ##                             output
+            ##                             output)))]
+            ##           (case expansion
+            ##             (^ (list single))
+            ##             (compile single)
+
+            ##             _
+            ##             (///.throw macro-call-must-have-single-expansion code)))
+
+            ##         _
+            ##         (functionA.apply compile funcT funcA args)))
+
+            ##     _
+            ##     (functionA.apply compile funcT funcA args)))
+
+            _
+            (///.throw unrecognized-syntax code)
+            ))))))
diff --git a/stdlib/source/lux/lang/analysis/function.lux b/stdlib/source/lux/lang/compiler/analysis/function.lux
index f6fea9bb0..b6e09f11a 100644
--- a/stdlib/source/lux/lang/analysis/function.lux
+++ b/stdlib/source/lux/lang/compiler/analysis/function.lux
@@ -8,13 +8,13 @@
              (coll [list "list/" Fold<List> Monoid<List> Monad<List>]))
        [macro]
        (macro [code])
-       [lang]
        (lang [type]
              (type ["tc" check])
-             [".L" scope]
-             [".L" analysis #+ Analysis Analyser]
-             (analysis [".A" type]
-                       [".A" inference]))))
+             [".L" scope]))
+  [///]
+  [// #+ Analysis Compiler]
+  [//type]
+  [//inference])
 
 (exception: #export (cannot-analyse {expected Type} {function Text} {argument Text} {body Code})
   (ex.report ["Type" (%type expected)]
@@ -30,13 +30,12 @@
                                           (format "\n  " (%n idx) " " (%code argC))))
                               (text.join-with ""))]))
 
-## [Analysers]
 (def: #export (function analyse function-name arg-name body)
-  (-> Analyser Text Text Code (Meta Analysis))
+  (-> Compiler Text Text Code (Meta Analysis))
   (do macro.Monad<Meta>
     [functionT macro.expected-type]
     (loop [expectedT functionT]
-      (lang.with-stacked-errors
+      (///.with-stacked-errors
         (.function (_ _)
           (ex.construct cannot-analyse [expectedT function-name arg-name body]))
         (case expectedT
@@ -49,56 +48,56 @@
             (recur value)
 
             #.None
-            (lang.fail (ex.construct cannot-analyse [expectedT function-name arg-name body])))
+            (///.fail (ex.construct cannot-analyse [expectedT function-name arg-name body])))
 
           (^template [<tag> <instancer>]
             (<tag> _)
             (do @
-              [[_ instanceT] (typeA.with-env <instancer>)]
+              [[_ instanceT] (//type.with-env <instancer>)]
               (recur (maybe.assume (type.apply (list instanceT) expectedT)))))
           ([#.UnivQ tc.existential]
            [#.ExQ tc.var])
           
           (#.Var id)
           (do @
-            [?expectedT' (typeA.with-env
+            [?expectedT' (//type.with-env
                            (tc.read id))]
             (case ?expectedT'
               (#.Some expectedT')
               (recur expectedT')
 
-              _
               ## Inference
+              _
               (do @
-                [[input-id inputT] (typeA.with-env tc.var)
-                 [output-id outputT] (typeA.with-env tc.var)
+                [[input-id inputT] (//type.with-env tc.var)
+                 [output-id outputT] (//type.with-env tc.var)
                  #let [functionT (#.Function inputT outputT)]
                  functionA (recur functionT)
-                 _ (typeA.with-env
+                 _ (//type.with-env
                      (tc.check expectedT functionT))]
                 (wrap functionA))
               ))
 
           (#.Function inputT outputT)
           (<| (:: @ map (.function (_ [scope bodyA])
-                          (#analysisL.Function (scopeL.environment scope) bodyA)))
-              lang.with-scope
+                          (#//.Function (scopeL.environment scope) bodyA)))
+              //.with-scope
               ## Functions have access not only to their argument, but
               ## also to themselves, through a local variable.
               (scopeL.with-local [function-name expectedT])
               (scopeL.with-local [arg-name inputT])
-              (typeA.with-type outputT)
+              (//type.with-type outputT)
               (analyse body))
           
           _
-          (lang.fail "")
+          (///.fail "")
           )))))
 
 (def: #export (apply analyse functionT functionA args)
-  (-> Analyser Type Analysis (List Code) (Meta Analysis))
-  (lang.with-stacked-errors
+  (-> Compiler Type Analysis (List Code) (Meta Analysis))
+  (///.with-stacked-errors
     (.function (_ _)
       (ex.construct cannot-apply [functionT args]))
     (do macro.Monad<Meta>
-      [[applyT argsA] (inferenceA.general analyse functionT args)]
-      (wrap (analysisL.apply [functionA argsA])))))
+      [[applyT argsA] (//inference.general analyse functionT args)]
+      (wrap (//.apply [functionA argsA])))))
diff --git a/stdlib/source/lux/lang/analysis/inference.lux b/stdlib/source/lux/lang/compiler/analysis/inference.lux
index 732a8e6e3..abf1529d6 100644
--- a/stdlib/source/lux/lang/analysis/inference.lux
+++ b/stdlib/source/lux/lang/compiler/analysis/inference.lux
@@ -6,16 +6,16 @@
              [text]
              text/format
              (coll [list "list/" Functor<List>]))
-       [macro "macro/" Monad<Meta>]
-       [lang]
-       (lang [type]
-             (type ["tc" check])
-             [analysis #+ Analysis Analyser]
-             (analysis [".A" type]))))
-
-(exception: #export (variant-tag-out-of-bounds {size Nat} {tag analysis.Tag} {type Type})
+       [macro])
+  (//// [type]
+        (type ["tc" check]))
+  [/// #+ "operation/" Monad<Operation>]
+  [// #+ Tag Analysis Operation Compiler]
+  [//type])
+
+(exception: #export (variant-tag-out-of-bounds {size Nat} {tag Tag} {type Type})
   (ex.report ["Tag" (%n tag)]
-             ["Variant size" (%n size)]
+             ["Variant size" (%i (.int size))]
              ["Variant type" (%type type)]))
 
 (exception: #export (cannot-infer {type Type} {args (List Code)})
@@ -43,16 +43,16 @@
   [invalid-type-application]
   )
 
-(def: (replace-bound bound-idx replacementT type)
+(def: (replace bound-idx replacement type)
   (-> Nat Type Type Type)
   (case type
     (#.Primitive name params)
-    (#.Primitive name (list/map (replace-bound bound-idx replacementT) params))
+    (#.Primitive name (list/map (replace bound-idx replacement) params))
 
     (^template [<tag>]
       (<tag> left right)
-      (<tag> (replace-bound bound-idx replacementT left)
-             (replace-bound bound-idx replacementT right)))
+      (<tag> (replace bound-idx replacement left)
+             (replace bound-idx replacement right)))
     ([#.Sum]
      [#.Product]
      [#.Function]
@@ -60,13 +60,13 @@
     
     (#.Bound idx)
     (if (n/= bound-idx idx)
-      replacementT
+      replacement
       type)
 
     (^template [<tag>]
       (<tag> env quantified)
-      (<tag> (list/map (replace-bound bound-idx replacementT) env)
-             (replace-bound (n/+ +2 bound-idx) replacementT quantified)))
+      (<tag> (list/map (replace bound-idx replacement) env)
+             (replace (n/+ +2 bound-idx) replacement quantified)))
     ([#.UnivQ]
      [#.ExQ])
     
@@ -74,13 +74,13 @@
     type))
 
 (def: new-named-type
-  (Meta Type)
-  (do macro.Monad<Meta>
-    [[_module _line _column] macro.cursor
-     [ex-id exT] (typeA.with-env tc.existential)]
-    (wrap (#.Primitive (format "{New Type @ " (%t _module)
-                               "," (%n _line)
-                               "," (%n _column)
+  (Operation Type)
+  (do ///.Monad<Operation>
+    [[module line column] macro.cursor
+     [ex-id _] (//type.with-env tc.existential)]
+    (wrap (#.Primitive (format "{New Type @ " (%t module)
+                               "," (%n line)
+                               "," (%n column)
                                "} " (%n ex-id))
                        (list)))))
 
@@ -92,11 +92,11 @@
 ## But, so long as the type being used for the inference can be treated
 ## as a function type, this method of inference should work.
 (def: #export (general analyse inferT args)
-  (-> Analyser Type (List Code) (Meta [Type (List Analysis)]))
+  (-> Compiler Type (List Code) (Operation [Type (List Analysis)]))
   (case args
     #.Nil
-    (do macro.Monad<Meta>
-      [_ (typeA.infer inferT)]
+    (do ///.Monad<Operation>
+      [_ (//type.infer inferT)]
       (wrap [inferT (list)]))
     
     (#.Cons argC args')
@@ -105,23 +105,23 @@
       (general analyse unnamedT args)
 
       (#.UnivQ _)
-      (do macro.Monad<Meta>
-        [[var-id varT] (typeA.with-env tc.var)]
+      (do ///.Monad<Operation>
+        [[var-id varT] (//type.with-env tc.var)]
         (general analyse (maybe.assume (type.apply (list varT) inferT)) args))
 
       (#.ExQ _)
-      (do macro.Monad<Meta>
-        [[var-id varT] (typeA.with-env tc.var)
+      (do ///.Monad<Operation>
+        [[var-id varT] (//type.with-env tc.var)
          output (general analyse
                          (maybe.assume (type.apply (list varT) inferT))
                          args)
-         bound? (typeA.with-env
+         bound? (//type.with-env
                   (tc.bound? var-id))
          _ (if bound?
              (wrap [])
              (do @
                [newT new-named-type]
-               (typeA.with-env
+               (//type.with-env
                  (tc.check varT newT))))]
         (wrap output))
 
@@ -131,7 +131,7 @@
         (general analyse outputT args)
 
         #.None
-        (lang.throw invalid-type-application inferT))
+        (///.throw invalid-type-application inferT))
 
       ## Arguments are inferred back-to-front because, by convention,
       ## Lux functions take the most important arguments *last*, which
@@ -141,39 +141,39 @@
       ## avoided in Lux code, since the inference algorithm can piece
       ## things together more easily.
       (#.Function inputT outputT)
-      (do macro.Monad<Meta>
+      (do ///.Monad<Operation>
         [[outputT' args'A] (general analyse outputT args')
-         argA (lang.with-stacked-errors
+         argA (///.with-stacked-errors
                 (function (_ _)
                   (ex.construct cannot-infer-argument [inputT argC]))
-                (typeA.with-type inputT
+                (//type.with-type inputT
                   (analyse argC)))]
         (wrap [outputT' (list& argA args'A)]))
 
       (#.Var infer-id)
-      (do macro.Monad<Meta>
-        [?inferT' (typeA.with-env (tc.read infer-id))]
+      (do ///.Monad<Operation>
+        [?inferT' (//type.with-env (tc.read infer-id))]
         (case ?inferT'
           (#.Some inferT')
           (general analyse inferT' args)
 
           _
-          (lang.throw cannot-infer [inferT args])))
+          (///.throw cannot-infer [inferT args])))
 
       _
-      (lang.throw cannot-infer [inferT args]))
+      (///.throw cannot-infer [inferT args]))
     ))
 
 ## Turns a record type into the kind of function type suitable for inference.
 (def: #export (record inferT)
-  (-> Type (Meta Type))
+  (-> Type (Operation Type))
   (case inferT
     (#.Named name unnamedT)
     (record unnamedT)
 
     (^template [<tag>]
       (<tag> env bodyT)
-      (do macro.Monad<Meta>
+      (do ///.Monad<Operation>
         [bodyT+ (record bodyT)]
         (wrap (<tag> env bodyT+))))
     ([#.UnivQ]
@@ -185,28 +185,28 @@
       (record outputT)
 
       #.None
-      (lang.throw invalid-type-application inferT))
+      (///.throw invalid-type-application inferT))
 
     (#.Product _)
-    (macro/wrap (type.function (type.flatten-tuple inferT) inferT))
+    (operation/wrap (type.function (type.flatten-tuple inferT) inferT))
 
     _
-    (lang.throw not-a-record-type inferT)))
+    (///.throw not-a-record-type inferT)))
 
 ## Turns a variant type into the kind of function type suitable for inference.
 (def: #export (variant tag expected-size inferT)
-  (-> Nat Nat Type (Meta Type))
+  (-> Nat Nat Type (Operation Type))
   (loop [depth +0
          currentT inferT]
     (case currentT
       (#.Named name unnamedT)
-      (do macro.Monad<Meta>
+      (do ///.Monad<Operation>
         [unnamedT+ (recur depth unnamedT)]
         (wrap unnamedT+))
 
       (^template [<tag>]
         (<tag> env bodyT)
-        (do macro.Monad<Meta>
+        (do ///.Monad<Operation>
           [bodyT+ (recur (inc depth) bodyT)]
           (wrap (<tag> env bodyT+))))
       ([#.UnivQ]
@@ -221,28 +221,28 @@
                        (n/< boundary tag)))
               (case (list.nth tag cases)
                 (#.Some caseT)
-                (macro/wrap (if (n/= +0 depth)
-                              (type.function (list caseT) currentT)
-                              (let [replace! (replace-bound (|> depth dec (n/* +2)) inferT)]
-                                (type.function (list (replace! caseT))
-                                  (replace! currentT)))))
+                (operation/wrap (if (n/= +0 depth)
+                                  (type.function (list caseT) currentT)
+                                  (let [replace' (replace (|> depth dec (n/* +2)) inferT)]
+                                    (type.function (list (replace' caseT))
+                                      (replace' currentT)))))
 
                 #.None
-                (lang.throw variant-tag-out-of-bounds [expected-size tag inferT]))
+                (///.throw variant-tag-out-of-bounds [expected-size tag inferT]))
               
               (n/< expected-size actual-size)
-              (lang.throw smaller-variant-than-expected [expected-size actual-size])
+              (///.throw smaller-variant-than-expected [expected-size actual-size])
 
               (n/= boundary tag)
               (let [caseT (type.variant (list.drop boundary cases))]
-                (macro/wrap (if (n/= +0 depth)
-                              (type.function (list caseT) currentT)
-                              (let [replace! (replace-bound (|> depth dec (n/* +2)) inferT)]
-                                (type.function (list (replace! caseT))
-                                  (replace! currentT))))))
+                (operation/wrap (if (n/= +0 depth)
+                                  (type.function (list caseT) currentT)
+                                  (let [replace' (replace (|> depth dec (n/* +2)) inferT)]
+                                    (type.function (list (replace' caseT))
+                                      (replace' currentT))))))
               
               ## else
-              (lang.throw variant-tag-out-of-bounds [expected-size tag inferT])))
+              (///.throw variant-tag-out-of-bounds [expected-size tag inferT])))
 
       (#.Apply inputT funcT)
       (case (type.apply (list inputT) funcT)
@@ -250,7 +250,7 @@
         (variant tag expected-size outputT)
 
         #.None
-        (lang.throw invalid-type-application inferT))
+        (///.throw invalid-type-application inferT))
 
       _
-      (lang.throw not-a-variant-type inferT))))
+      (///.throw not-a-variant-type inferT))))
diff --git a/stdlib/source/lux/lang/analysis/primitive.lux b/stdlib/source/lux/lang/compiler/analysis/primitive.lux
index 74596fba2..74596fba2 100644
--- a/stdlib/source/lux/lang/analysis/primitive.lux
+++ b/stdlib/source/lux/lang/compiler/analysis/primitive.lux
diff --git a/stdlib/source/lux/lang/analysis/reference.lux b/stdlib/source/lux/lang/compiler/analysis/reference.lux
index cceb4db7d..6f4908f9d 100644
--- a/stdlib/source/lux/lang/analysis/reference.lux
+++ b/stdlib/source/lux/lang/compiler/analysis/reference.lux
@@ -4,15 +4,16 @@
        [macro]
        (macro [code])
        (lang (type ["tc" check])))
-  [// #+ Analysis]
+  [///]
+  [// #+ Analysis Operation]
   [//type]
-  [///reference]
-  [///scope])
+  [////reference]
+  [////scope])
 
 ## [Analysers]
 (def: (definition def-name)
-  (-> Ident (Meta Analysis))
-  (do macro.Monad<Meta>
+  (-> Ident (Operation Analysis))
+  (do ///.Monad<Operation>
     [[actualT def-anns _] (macro.find-def def-name)]
     (case (macro.get-symbol-ann (ident-for #.alias) def-anns)
       (#.Some real-def-name)
@@ -21,27 +22,27 @@
       _
       (do @
         [_ (//type.infer actualT)]
-        (:: @ map (|>> ///reference.constant #//.Reference)
+        (:: @ map (|>> ////reference.constant #//.Reference)
             (macro.normalize def-name))))))
 
 (def: (variable var-name)
-  (-> Text (Meta (Maybe Analysis)))
-  (do macro.Monad<Meta>
-    [?var (///scope.find var-name)]
+  (-> Text (Operation (Maybe Analysis)))
+  (do ///.Monad<Operation>
+    [?var (////scope.find var-name)]
     (case ?var
       (#.Some [actualT ref])
       (do @
         [_ (//type.infer actualT)]
-        (wrap (#.Some (|> ref ///reference.variable #//.Reference))))
+        (wrap (#.Some (|> ref ////reference.variable #//.Reference))))
 
       #.None
       (wrap #.None))))
 
 (def: #export (reference reference)
-  (-> Ident (Meta Analysis))
+  (-> Ident (Operation Analysis))
   (case reference
     ["" simple-name]
-    (do macro.Monad<Meta>
+    (do ///.Monad<Operation>
       [?var (variable simple-name)]
       (case ?var
         (#.Some varA)
diff --git a/stdlib/source/lux/lang/analysis/structure.lux b/stdlib/source/lux/lang/compiler/analysis/structure.lux
index bc527cd49..78b36bc32 100644
--- a/stdlib/source/lux/lang/analysis/structure.lux
+++ b/stdlib/source/lux/lang/compiler/analysis/structure.lux
@@ -10,16 +10,16 @@
                    (dictionary ["dict" unordered #+ Dict]))
              text/format)
        [macro]
-       (macro [code])
-       [lang]
-       (lang [type]
-             (type ["tc" check])
-             [analysis #+ Analysis Analyser]
-             (analysis [".A" type]
-                       [".A" primitive]
-                       [".A" inference]))))
-
-(exception: #export (invalid-variant-type {type Type} {tag analysis.Tag} {code Code})
+       (macro [code]))
+  (//// [type]
+        (type ["tc" check]))
+  [///]
+  [// #+ Tag Analysis Operation Compiler]
+  [//type]
+  [//primitive]
+  [//inference])
+
+(exception: #export (invalid-variant-type {type Type} {tag Tag} {code Code})
   (ex.report ["Type" (%type type)]
              ["Tag" (%n tag)]
              ["Expression" (%code code)]))
@@ -37,7 +37,7 @@
   (%type type))
 
 (do-template [<name>]
-  [(exception: #export (<name> {type Type} {tag analysis.Tag} {code Code})
+  [(exception: #export (<name> {type Type} {tag Tag} {code Code})
      (ex.report ["Type" (%type type)]
                 ["Tag" (%n tag)]
                 ["Expression" (%code code)]))]
@@ -74,10 +74,10 @@
                                       code.record))]))
 
 (def: #export (sum analyse tag valueC)
-  (-> Analyser Nat Code (Meta Analysis))
-  (do macro.Monad<Meta>
+  (-> Compiler Nat Code (Operation Analysis))
+  (do ///.Monad<Operation>
     [expectedT macro.expected-type]
-    (lang.with-stacked-errors
+    (///.with-stacked-errors
       (function (_ _)
         (ex.construct cannot-analyse-variant [expectedT tag valueC]))
       (case expectedT
@@ -87,38 +87,38 @@
           (case (list.nth tag flat)
             (#.Some variant-type)
             (do @
-              [valueA (typeA.with-type variant-type
+              [valueA (//type.with-type variant-type
                         (analyse valueC))]
-              (wrap (analysis.sum-analysis type-size tag valueA)))
+              (wrap (//.sum-analysis type-size tag valueA)))
 
             #.None
-            (lang.throw inferenceA.variant-tag-out-of-bounds [type-size tag expectedT])))
+            (///.throw //inference.variant-tag-out-of-bounds [type-size tag expectedT])))
 
         (#.Named name unnamedT)
-        (typeA.with-type unnamedT
+        (//type.with-type unnamedT
           (sum analyse tag valueC))
 
         (#.Var id)
         (do @
-          [?expectedT' (typeA.with-env
+          [?expectedT' (//type.with-env
                          (tc.read id))]
           (case ?expectedT'
             (#.Some expectedT')
-            (typeA.with-type expectedT'
+            (//type.with-type expectedT'
               (sum analyse tag valueC))
 
             _
             ## Cannot do inference when the tag is numeric.
             ## This is because there is no way of knowing how many
             ## cases the inferred sum type would have.
-            (lang.throw cannot-infer-numeric-tag [expectedT tag valueC])
+            (///.throw cannot-infer-numeric-tag [expectedT tag valueC])
             ))
 
         (^template [<tag> <instancer>]
           (<tag> _)
           (do @
-            [[instance-id instanceT] (typeA.with-env <instancer>)]
-            (typeA.with-type (maybe.assume (type.apply (list instanceT) expectedT))
+            [[instance-id instanceT] (//type.with-env <instancer>)]
+            (//type.with-type (maybe.assume (type.apply (list instanceT) expectedT))
               (sum analyse tag valueC))))
         ([#.UnivQ tc.existential]
          [#.ExQ tc.var])
@@ -127,30 +127,30 @@
         (case funT
           (#.Var funT-id)
           (do @
-            [?funT' (typeA.with-env (tc.read funT-id))]
+            [?funT' (//type.with-env (tc.read funT-id))]
             (case ?funT'
               (#.Some funT')
-              (typeA.with-type (#.Apply inputT funT')
+              (//type.with-type (#.Apply inputT funT')
                 (sum analyse tag valueC))
 
               _
-              (lang.throw invalid-variant-type [expectedT tag valueC])))
+              (///.throw invalid-variant-type [expectedT tag valueC])))
 
           _
           (case (type.apply (list inputT) funT)
             #.None
-            (lang.throw not-a-quantified-type funT)
+            (///.throw not-a-quantified-type funT)
             
             (#.Some outputT)
-            (typeA.with-type outputT
+            (//type.with-type outputT
               (sum analyse tag valueC))))
         
         _
-        (lang.throw invalid-variant-type [expectedT tag valueC])))))
+        (///.throw invalid-variant-type [expectedT tag valueC])))))
 
 (def: (typed-product analyse membersC+)
-  (-> Analyser (List Code) (Meta Analysis))
-  (do macro.Monad<Meta>
+  (-> Compiler (List Code) (Operation Analysis))
+  (do ///.Monad<Operation>
     [expectedT macro.expected-type]
     (loop [expectedT expectedT
            membersC+ membersC+]
@@ -158,17 +158,17 @@
         ## If the tuple runs out, whatever expression is the last gets
         ## matched to the remaining type.
         [tailT (#.Cons tailC #.Nil)]
-        (typeA.with-type tailT
+        (//type.with-type tailT
           (analyse tailC))
 
         ## If the type and the code are still ongoing, match each
         ## sub-expression to its corresponding type.
         [(#.Product leftT rightT) (#.Cons leftC rightC)]
         (do @
-          [leftA (typeA.with-type leftT
+          [leftA (//type.with-type leftT
                    (analyse leftC))
            rightA (recur rightT rightC)]
-          (wrap (#analysis.Structure (#analysis.Product leftA rightA))))
+          (wrap (#//.Structure (#//.Product leftA rightA))))
 
         ## If, however, the type runs out but there is still enough
         ## tail, the remaining elements get packaged into another
@@ -184,14 +184,14 @@
         (|> tailC
             code.tuple
             analyse
-            (typeA.with-type tailT)
-            (:: @ map (|>> analysis.no-op)))))))
+            (//type.with-type tailT)
+            (:: @ map (|>> //.no-op)))))))
 
 (def: #export (product analyse membersC)
-  (-> Analyser (List Code) (Meta Analysis))
-  (do macro.Monad<Meta>
+  (-> Compiler (List Code) (Operation Analysis))
+  (do ///.Monad<Operation>
     [expectedT macro.expected-type]
-    (lang.with-stacked-errors
+    (///.with-stacked-errors
       (function (_ _)
         (ex.construct cannot-analyse-tuple [expectedT membersC]))
       (case expectedT
@@ -199,33 +199,33 @@
         (..typed-product analyse membersC)
 
         (#.Named name unnamedT)
-        (typeA.with-type unnamedT
+        (//type.with-type unnamedT
           (product analyse membersC))
 
         (#.Var id)
         (do @
-          [?expectedT' (typeA.with-env
+          [?expectedT' (//type.with-env
                          (tc.read id))]
           (case ?expectedT'
             (#.Some expectedT')
-            (typeA.with-type expectedT'
+            (//type.with-type expectedT'
               (product analyse membersC))
 
             _
             ## Must do inference...
             (do @
-              [membersTA (monad.map @ (|>> analyse typeA.with-inference)
+              [membersTA (monad.map @ (|>> analyse //type.with-inference)
                                     membersC)
-               _ (typeA.with-env
+               _ (//type.with-env
                    (tc.check expectedT
                              (type.tuple (list/map product.left membersTA))))]
-              (wrap (analysis.product-analysis (list/map product.right membersTA))))))
+              (wrap (//.product-analysis (list/map product.right membersTA))))))
 
         (^template [<tag> <instancer>]
           (<tag> _)
           (do @
-            [[instance-id instanceT] (typeA.with-env <instancer>)]
-            (typeA.with-type (maybe.assume (type.apply (list instanceT) expectedT))
+            [[instance-id instanceT] (//type.with-env <instancer>)]
+            (//type.with-type (maybe.assume (type.apply (list instanceT) expectedT))
               (product analyse membersC))))
         ([#.UnivQ tc.existential]
          [#.ExQ tc.var])
@@ -234,31 +234,31 @@
         (case funT
           (#.Var funT-id)
           (do @
-            [?funT' (typeA.with-env (tc.read funT-id))]
+            [?funT' (//type.with-env (tc.read funT-id))]
             (case ?funT'
               (#.Some funT')
-              (typeA.with-type (#.Apply inputT funT')
+              (//type.with-type (#.Apply inputT funT')
                 (product analyse membersC))
 
               _
-              (lang.throw invalid-tuple-type [expectedT membersC])))
+              (///.throw invalid-tuple-type [expectedT membersC])))
 
           _
           (case (type.apply (list inputT) funT)
             #.None
-            (lang.throw not-a-quantified-type funT)
+            (///.throw not-a-quantified-type funT)
             
             (#.Some outputT)
-            (typeA.with-type outputT
+            (//type.with-type outputT
               (product analyse membersC))))
         
         _
-        (lang.throw invalid-tuple-type [expectedT membersC])
+        (///.throw invalid-tuple-type [expectedT membersC])
         ))))
 
 (def: #export (tagged-sum analyse tag valueC)
-  (-> Analyser Ident Code (Meta Analysis))
-  (do macro.Monad<Meta>
+  (-> Compiler Ident Code (Operation Analysis))
+  (do ///.Monad<Operation>
     [tag (macro.normalize tag)
      [idx group variantT] (macro.resolve-tag tag)
      expectedT macro.expected-type]
@@ -266,9 +266,9 @@
       (#.Var _)
       (do @
         [#let [case-size (list.size group)]
-         inferenceT (inferenceA.variant idx case-size variantT)
-         [inferredT valueA+] (inferenceA.general analyse inferenceT (list valueC))]
-        (wrap (analysis.sum-analysis case-size idx (|> valueA+ list.head maybe.assume))))
+         inferenceT (//inference.variant idx case-size variantT)
+         [inferredT valueA+] (//inference.general analyse inferenceT (list valueC))]
+        (wrap (//.sum-analysis case-size idx (|> valueA+ list.head maybe.assume))))
 
       _
       (..sum analyse idx valueC))))
@@ -278,38 +278,38 @@
 ## Normalization just means that all the tags get resolved to their
 ## canonical form (with their corresponding module identified).
 (def: #export (normalize record)
-  (-> (List [Code Code]) (Meta (List [Ident Code])))
-  (monad.map macro.Monad<Meta>
+  (-> (List [Code Code]) (Operation (List [Ident Code])))
+  (monad.map ///.Monad<Operation>
              (function (_ [key val])
                (case key
                  [_ (#.Tag key)]
-                 (do macro.Monad<Meta>
+                 (do ///.Monad<Operation>
                    [key (macro.normalize key)]
                    (wrap [key val]))
 
                  _
-                 (lang.throw record-keys-must-be-tags [key record])))
+                 (///.throw record-keys-must-be-tags [key record])))
              record))
 
 ## Lux already possesses the means to analyse tuples, so
 ## re-implementing the same functionality for records makes no sense.
 ## Records, thus, get transformed into tuples by ordering the elements.
 (def: #export (order record)
-  (-> (List [Ident Code]) (Meta [(List Code) Type]))
+  (-> (List [Ident Code]) (Operation [(List Code) Type]))
   (case record
     ## empty-record = empty-tuple = unit = []
     #.Nil
-    (:: macro.Monad<Meta> wrap [(list) Any])
+    (:: ///.Monad<Operation> wrap [(list) Any])
 
     (#.Cons [head-k head-v] _)
-    (do macro.Monad<Meta>
+    (do ///.Monad<Operation>
       [head-k (macro.normalize head-k)
        [_ tag-set recordT] (macro.resolve-tag head-k)
        #let [size-record (list.size record)
              size-ts (list.size tag-set)]
        _ (if (n/= size-ts size-record)
            (wrap [])
-           (lang.throw record-size-mismatch [size-ts size-record recordT record]))
+           (///.throw record-size-mismatch [size-ts size-record recordT record]))
        #let [tuple-range (list.n/range +0 (dec size-ts))
              tag->idx (dict.from-list ident.Hash<Ident> (list.zip2 tag-set tuple-range))]
        idx->val (monad.fold @
@@ -318,11 +318,11 @@
                                 [key (macro.normalize key)]
                                 (case (dict.get key tag->idx)
                                   #.None
-                                  (lang.throw tag-does-not-belong-to-record [key recordT])
+                                  (///.throw tag-does-not-belong-to-record [key recordT])
 
                                   (#.Some idx)
                                   (if (dict.contains? idx idx->val)
-                                    (lang.throw cannot-repeat-tag [key record])
+                                    (///.throw cannot-repeat-tag [key record])
                                     (wrap (dict.put idx val idx->val))))))
                             (: (Dict Nat Code)
                                (dict.new number.Hash<Nat>))
@@ -333,13 +333,13 @@
     ))
 
 (def: #export (record analyse members)
-  (-> Analyser (List [Code Code]) (Meta Analysis))
-  (do macro.Monad<Meta>
+  (-> Compiler (List [Code Code]) (Operation Analysis))
+  (do ///.Monad<Operation>
     [members (normalize members)
      [membersC recordT] (order members)]
     (case membersC
       (^ (list))
-      primitiveA.unit
+      //primitive.unit
       
       (^ (list singletonC))
       (analyse singletonC)
@@ -350,9 +350,9 @@
         (case expectedT
           (#.Var _)
           (do @
-            [inferenceT (inferenceA.record recordT)
-             [inferredT membersA] (inferenceA.general analyse inferenceT membersC)]
-            (wrap (analysis.product-analysis membersA)))
+            [inferenceT (//inference.record recordT)
+             [inferredT membersA] (//inference.general analyse inferenceT membersC)]
+            (wrap (//.product-analysis membersA)))
 
           _
           (..product analyse membersC))))))
diff --git a/stdlib/source/lux/lang/analysis/type.lux b/stdlib/source/lux/lang/compiler/analysis/type.lux
index a7f9b3b29..9fcfb2743 100644
--- a/stdlib/source/lux/lang/analysis/type.lux
+++ b/stdlib/source/lux/lang/compiler/analysis/type.lux
@@ -1,56 +1,57 @@
 (.module:
   lux
   (lux (control [monad #+ do])
-       (data ["e" error])
+       (data [error])
        [macro]
-       [lang]
-       (lang (type ["tc" check]))))
+       (lang (type ["tc" check])))
+  [///]
+  [// #+ Operation])
 
 (def: #export (with-type expected action)
-  (All [a] (-> Type (Meta a) (Meta a)))
+  (All [a] (-> Type (Operation a) (Operation a)))
   (function (_ compiler)
     (case (action (set@ #.expected (#.Some expected) compiler))
-      (#e.Success [compiler' output])
+      (#error.Success [compiler' output])
       (let [old-expected (get@ #.expected compiler)]
-        (#e.Success [(set@ #.expected old-expected compiler')
-                     output]))
+        (#error.Success [(set@ #.expected old-expected compiler')
+                         output]))
 
-      (#e.Error error)
-      (#e.Error error))))
+      (#error.Error error)
+      (#error.Error error))))
 
 (def: #export (with-env action)
-  (All [a] (-> (tc.Check a) (Meta a)))
+  (All [a] (-> (tc.Check a) (Operation a)))
   (function (_ compiler)
     (case (action (get@ #.type-context compiler))
-      (#e.Error error)
-      ((lang.fail error) compiler)
+      (#error.Error error)
+      ((///.fail error) compiler)
 
-      (#e.Success [context' output])
-      (#e.Success [(set@ #.type-context context' compiler)
-                   output]))))
+      (#error.Success [context' output])
+      (#error.Success [(set@ #.type-context context' compiler)
+                       output]))))
 
 (def: #export (with-fresh-env action)
-  (All [a] (-> (Meta a) (Meta a)))
+  (All [a] (-> (Operation a) (Operation a)))
   (function (_ compiler)
     (let [old (get@ #.type-context compiler)]
       (case (action (set@ #.type-context tc.fresh-context compiler))
-        (#e.Success [compiler' output])
-        (#e.Success [(set@ #.type-context old compiler')
-                     output])
+        (#error.Success [compiler' output])
+        (#error.Success [(set@ #.type-context old compiler')
+                         output])
 
         output
         output))))
 
 (def: #export (infer actualT)
-  (-> Type (Meta Any))
-  (do macro.Monad<Meta>
+  (-> Type (Operation Any))
+  (do ///.Monad<Operation>
     [expectedT macro.expected-type]
     (with-env
       (tc.check expectedT actualT))))
 
 (def: #export (with-inference action)
-  (All [a] (-> (Meta a) (Meta [Type a])))
-  (do macro.Monad<Meta>
+  (All [a] (-> (Operation a) (Operation [Type a])))
+  (do ///.Monad<Operation>
     [[_ varT] (..with-env
                 tc.var)
      output (with-type varT
diff --git a/stdlib/source/lux/lang/compiler/extension.lux b/stdlib/source/lux/lang/compiler/extension.lux
new file mode 100644
index 000000000..28dcd4637
--- /dev/null
+++ b/stdlib/source/lux/lang/compiler/extension.lux
@@ -0,0 +1,68 @@
+(.module:
+  lux
+  (lux (control [monad #+ do]
+                ["ex" exception #+ exception:])
+       (data [error #+ Error]
+             [text]
+             (coll (dictionary ["dict" unordered #+ Dict]))))
+  [// #+ Eval]
+  [//compiler #+ Operation Compiler]
+  [//analysis #+ Analyser]
+  [//synthesis #+ Synthesizer]
+  [//translation #+ Translator])
+
+(type: #export (Extension i)
+  (#Base i)
+  (#Extension [Text (List (Extension i))]))
+
+(with-expansions [<Bundle> (as-is (Dict Text (-> Text (Handler s i o))))]
+  (type: #export (Handler s i o)
+    (-> (Compiler [s <Bundle>] (Extension i) (Extension o))
+        (Compiler [s <Bundle>] (List (Extension i)) (Extension o))))
+
+  (type: #export (Bundle s i o)
+    <Bundle>))
+
+(do-template [<name>]
+  [(exception: #export (<name> {name Text})
+     (ex.report ["Name" name]))]
+
+  [unknown-extension]
+  [cannot-overwrite-existing-extension]
+  )
+
+(def: #export (extend compiler)
+  (All [s i o]
+    (-> (Compiler s i o)
+        (Compiler [s (Bundle s i o)]
+                  (Extension i)
+                  (Extension o))))
+  (function (compiler' input (^@ stateE [stateB bundle]))
+    (case input
+      (#Base input')
+      (do error.Monad<Error>
+        [[stateB' output] (compiler input' stateB)]
+        (wrap [[stateB' bundle] (#Base output)]))
+      
+      (#Extension name parameters)
+      (case (dict.get name bundle)
+        (#.Some handler)
+        (do error.Monad<Error>
+          [[stateE' output] (handler name compiler' parameters stateE)]
+          (wrap [stateE' output]))
+        
+        #.None
+        (ex.throw unknown-extension name)))))
+
+(def: #export (install name handler)
+  (All [s i o]
+    (-> Text (-> Text (Handler s i o))
+        (Operation [s (Bundle s i o)] Any)))
+  (function (_ (^@ stateE [_ bundle]))
+    (if (dict.contains? name bundle)
+      (ex.throw cannot-overwrite-existing-extension name)
+      (ex.return [stateE (dict.put name handler bundle)]))))
+
+(def: #export fresh
+  Bundle
+  (dict.new text.Hash<Text>))
diff --git a/stdlib/source/lux/lang/extension/analysis.lux b/stdlib/source/lux/lang/compiler/extension/analysis.lux
index b412e28df..77439643e 100644
--- a/stdlib/source/lux/lang/extension/analysis.lux
+++ b/stdlib/source/lux/lang/compiler/extension/analysis.lux
@@ -3,12 +3,14 @@
   (lux (data [text]
              (coll [list "list/" Functor<List>]
                    (dictionary ["dict" unordered #+ Dict]))))
+  [///analysis #+ Analysis State]
+  [///synthesis #+ Synthesis]
   [//]
   [/common]
   [/host])
 
 (def: #export defaults
-  (//.Extension //.Analysis)
+  (//.Bundle State Analysis Synthesis)
   (|> /common.extensions
       (dict.merge /host.extensions)
       dict.entries
diff --git a/stdlib/source/lux/lang/compiler/extension/analysis/common.lux b/stdlib/source/lux/lang/compiler/extension/analysis/common.lux
new file mode 100644
index 000000000..6bd1a93bf
--- /dev/null
+++ b/stdlib/source/lux/lang/compiler/extension/analysis/common.lux
@@ -0,0 +1,396 @@
+(.module:
+  lux
+  (lux (control [monad #+ do]
+                ["ex" exception #+ exception:]
+                [thread #+ Box])
+       (concurrency [atom #+ Atom])
+       (data [text]
+             text/format
+             (coll [list "list/" Functor<List>]
+                   [array]
+                   (dictionary ["dict" unordered #+ Dict])))
+       [lang]
+       (lang (type ["tc" check])
+             (analysis [".A" type]
+                       [".A" case]
+                       [".A" function]))
+       [io #+ IO])
+  (//// [compiler]
+        [analysis #+ Analysis])
+  [///]
+  [///bundle])
+
+(type: Handler
+  (///.Handler .Lux .Code Analysis))
+
+## [Utils]
+(def: (simple extension inputsT+ outputT)
+  (-> Text (List Type) Type ..Handler)
+  (let [num-expected (list.size inputsT+)]
+    (function (_ analyse args)
+      (let [num-actual (list.size args)]
+        (if (n/= num-expected num-actual)
+          (do compiler.Monad<Operation>
+            [_ (typeA.infer outputT)
+             argsA (monad.map @
+                              (function (_ [argT argC])
+                                (typeA.with-type argT
+                                  (analyse argC)))
+                              (list.zip2 inputsT+ args))]
+            (wrap (#///.Extension extension argsA)))
+          (lang.throw ///bundle.incorrect-arity [extension num-expected num-actual]))))))
+
+(def: #export (nullary valueT extension)
+  (-> Type Text ..Handler)
+  (simple extension (list) valueT))
+
+(def: #export (unary inputT outputT extension)
+  (-> Type Type Text ..Handler)
+  (simple extension (list inputT) outputT))
+
+(def: #export (binary subjectT paramT outputT extension)
+  (-> Type Type Type Text ..Handler)
+  (simple extension (list subjectT paramT) outputT))
+
+(def: #export (trinary subjectT param0T param1T outputT extension)
+  (-> Type Type Type Type Text ..Handler)
+  (simple extension (list subjectT param0T param1T) outputT))
+
+## [Analysers]
+## "lux is" represents reference/pointer equality.
+(def: (lux//is extension)
+  (-> Text ..Handler)
+  (function (_ analyse args)
+    (do compiler.Monad<Operation>
+      [[var-id varT] (typeA.with-env tc.var)]
+      ((binary varT varT Bool extension)
+       analyse args))))
+
+## "lux try" provides a simple way to interact with the host platform's
+## error-handling facilities.
+(def: (lux//try extension)
+  (-> Text ..Handler)
+  (function (_ analyse args)
+    (case args
+      (^ (list opC))
+      (do compiler.Monad<Operation>
+        [[var-id varT] (typeA.with-env tc.var)
+         _ (typeA.infer (type (Either Text varT)))
+         opA (typeA.with-type (type (IO varT))
+               (analyse opC))]
+        (wrap (#///.Extension extension (list opA))))
+      
+      _
+      (lang.throw ///bundle.incorrect-arity [extension +1 (list.size args)]))))
+
+(def: (lux//in-module extension)
+  (-> Text ..Handler)
+  (function (_ analyse argsC+)
+    (case argsC+
+      (^ (list [_ (#.Text module-name)] exprC))
+      (lang.with-current-module module-name
+        (analyse exprC))
+      
+      _
+      (lang.throw ///bundle.invalid-syntax [extension]))))
+
+## (do-template [<name> <type>]
+##   [(def: (<name> extension)
+##      (-> Text ..Handler)
+##      (function (_ analyse args)
+##        (case args
+##          (^ (list typeC valueC))
+##          (do compiler.Monad<Operation>
+##            [actualT (eval Type typeC)
+##             _ (typeA.infer (:! Type actualT))]
+##            (typeA.with-type <type>
+##              (analyse valueC)))
+
+##          _
+##          (lang.throw ///bundle.incorrect-arity [extension +2 (list.size args)]))))]
+
+##   [lux//check  (:! Type actualT)]
+##   [lux//coerce Any]
+##   )
+
+(def: (lux//check//type extension)
+  (-> Text ..Handler)
+  (function (_ analyse args)
+    (case args
+      (^ (list valueC))
+      (do compiler.Monad<Operation>
+        [_ (typeA.infer Type)
+         valueA (typeA.with-type Type
+                  (analyse valueC))]
+        (wrap valueA))
+      
+      _
+      (lang.throw ///bundle.incorrect-arity [extension +1 (list.size args)]))))
+
+(def: bundle/lux
+  ///.Bundle
+  (|> ///.fresh
+      (///bundle.install "is" lux//is)
+      (///bundle.install "try" lux//try)
+      (///bundle.install "check" lux//check)
+      (///bundle.install "coerce" lux//coerce)
+      (///bundle.install "check type" lux//check//type)
+      (///bundle.install "in-module" lux//in-module)))
+
+(def: bundle/io
+  ///.Bundle
+  (<| (///bundle.prefix "io")
+      (|> ///.fresh
+          (///bundle.install "log" (unary Text Any))
+          (///bundle.install "error" (unary Text Nothing))
+          (///bundle.install "exit" (unary Int Nothing))
+          (///bundle.install "current-time" (nullary Int)))))
+
+(def: bundle/bit
+  ///.Bundle
+  (<| (///bundle.prefix "bit")
+      (|> ///.fresh
+          (///bundle.install "and" (binary Nat Nat Nat))
+          (///bundle.install "or" (binary Nat Nat Nat))
+          (///bundle.install "xor" (binary Nat Nat Nat))
+          (///bundle.install "left-shift" (binary Nat Nat Nat))
+          (///bundle.install "logical-right-shift" (binary Nat Nat Nat))
+          (///bundle.install "arithmetic-right-shift" (binary Int Nat Int))
+          )))
+
+(def: bundle/int
+  ///.Bundle
+  (<| (///bundle.prefix "int")
+      (|> ///.fresh
+          (///bundle.install "+" (binary Int Int Int))
+          (///bundle.install "-" (binary Int Int Int))
+          (///bundle.install "*" (binary Int Int Int))
+          (///bundle.install "/" (binary Int Int Int))
+          (///bundle.install "%" (binary Int Int Int))
+          (///bundle.install "=" (binary Int Int Bool))
+          (///bundle.install "<" (binary Int Int Bool))
+          (///bundle.install "min" (nullary Int))
+          (///bundle.install "max" (nullary Int))
+          (///bundle.install "to-nat" (unary Int Nat))
+          (///bundle.install "to-frac" (unary Int Frac))
+          (///bundle.install "char" (unary Int Text)))))
+
+(def: bundle/deg
+  ///.Bundle
+  (<| (///bundle.prefix "deg")
+      (|> ///.fresh
+          (///bundle.install "+" (binary Deg Deg Deg))
+          (///bundle.install "-" (binary Deg Deg Deg))
+          (///bundle.install "*" (binary Deg Deg Deg))
+          (///bundle.install "/" (binary Deg Deg Deg))
+          (///bundle.install "%" (binary Deg Deg Deg))
+          (///bundle.install "=" (binary Deg Deg Bool))
+          (///bundle.install "<" (binary Deg Deg Bool))
+          (///bundle.install "scale" (binary Deg Nat Deg))
+          (///bundle.install "reciprocal" (binary Deg Nat Deg))
+          (///bundle.install "min" (nullary Deg))
+          (///bundle.install "max" (nullary Deg))
+          (///bundle.install "to-frac" (unary Deg Frac)))))
+
+(def: bundle/frac
+  ///.Bundle
+  (<| (///bundle.prefix "frac")
+      (|> ///.fresh
+          (///bundle.install "+" (binary Frac Frac Frac))
+          (///bundle.install "-" (binary Frac Frac Frac))
+          (///bundle.install "*" (binary Frac Frac Frac))
+          (///bundle.install "/" (binary Frac Frac Frac))
+          (///bundle.install "%" (binary Frac Frac Frac))
+          (///bundle.install "=" (binary Frac Frac Bool))
+          (///bundle.install "<" (binary Frac Frac Bool))
+          (///bundle.install "smallest" (nullary Frac))
+          (///bundle.install "min" (nullary Frac))
+          (///bundle.install "max" (nullary Frac))
+          (///bundle.install "not-a-number" (nullary Frac))
+          (///bundle.install "positive-infinity" (nullary Frac))
+          (///bundle.install "negative-infinity" (nullary Frac))
+          (///bundle.install "to-deg" (unary Frac Deg))
+          (///bundle.install "to-int" (unary Frac Int))
+          (///bundle.install "encode" (unary Frac Text))
+          (///bundle.install "decode" (unary Text (type (Maybe Frac)))))))
+
+(def: bundle/text
+  ///.Bundle
+  (<| (///bundle.prefix "text")
+      (|> ///.fresh
+          (///bundle.install "=" (binary Text Text Bool))
+          (///bundle.install "<" (binary Text Text Bool))
+          (///bundle.install "concat" (binary Text Text Text))
+          (///bundle.install "index" (trinary Text Text Nat (type (Maybe Nat))))
+          (///bundle.install "size" (unary Text Nat))
+          (///bundle.install "hash" (unary Text Nat))
+          (///bundle.install "replace-once" (trinary Text Text Text Text))
+          (///bundle.install "replace-all" (trinary Text Text Text Text))
+          (///bundle.install "char" (binary Text Nat (type (Maybe Nat))))
+          (///bundle.install "clip" (trinary Text Nat Nat (type (Maybe Text))))
+          )))
+
+(def: (array//get extension)
+  (-> Text ..Handler)
+  (function (_ analyse args)
+    (do compiler.Monad<Operation>
+      [[var-id varT] (typeA.with-env tc.var)]
+      ((binary (type (Array varT)) Nat (type (Maybe varT)) extension)
+       analyse args))))
+
+(def: (array//put extension)
+  (-> Text ..Handler)
+  (function (_ analyse args)
+    (do compiler.Monad<Operation>
+      [[var-id varT] (typeA.with-env tc.var)]
+      ((trinary (type (Array varT)) Nat varT (type (Array varT)) extension)
+       analyse args))))
+
+(def: (array//remove extension)
+  (-> Text ..Handler)
+  (function (_ analyse args)
+    (do compiler.Monad<Operation>
+      [[var-id varT] (typeA.with-env tc.var)]
+      ((binary (type (Array varT)) Nat (type (Array varT)) extension)
+       analyse args))))
+
+(def: bundle/array
+  ///.Bundle
+  (<| (///bundle.prefix "array")
+      (|> ///.fresh
+          (///bundle.install "new" (unary Nat Array))
+          (///bundle.install "get" array//get)
+          (///bundle.install "put" array//put)
+          (///bundle.install "remove" array//remove)
+          (///bundle.install "size" (unary (type (Ex [a] (Array a))) Nat))
+          )))
+
+(def: bundle/math
+  ///.Bundle
+  (<| (///bundle.prefix "math")
+      (|> ///.fresh
+          (///bundle.install "cos" (unary Frac Frac))
+          (///bundle.install "sin" (unary Frac Frac))
+          (///bundle.install "tan" (unary Frac Frac))
+          (///bundle.install "acos" (unary Frac Frac))
+          (///bundle.install "asin" (unary Frac Frac))
+          (///bundle.install "atan" (unary Frac Frac))
+          (///bundle.install "cosh" (unary Frac Frac))
+          (///bundle.install "sinh" (unary Frac Frac))
+          (///bundle.install "tanh" (unary Frac Frac))
+          (///bundle.install "exp" (unary Frac Frac))
+          (///bundle.install "log" (unary Frac Frac))
+          (///bundle.install "ceil" (unary Frac Frac))
+          (///bundle.install "floor" (unary Frac Frac))
+          (///bundle.install "round" (unary Frac Frac))
+          (///bundle.install "atan2" (binary Frac Frac Frac))
+          (///bundle.install "pow" (binary Frac Frac Frac))
+          )))
+
+(def: (atom-new extension)
+  (-> Text ..Handler)
+  (function (_ analyse args)
+    (case args
+      (^ (list initC))
+      (do compiler.Monad<Operation>
+        [[var-id varT] (typeA.with-env tc.var)
+         _ (typeA.infer (type (Atom varT)))
+         initA (typeA.with-type varT
+                 (analyse initC))]
+        (wrap (#///.Extension extension (list initA))))
+      
+      _
+      (lang.throw ///bundle.incorrect-arity [extension +1 (list.size args)]))))
+
+(def: (atom-read extension)
+  (-> Text ..Handler)
+  (function (_ analyse args)
+    (do compiler.Monad<Operation>
+      [[var-id varT] (typeA.with-env tc.var)]
+      ((unary (type (Atom varT)) varT extension)
+       analyse args))))
+
+(def: (atom//compare-and-swap extension)
+  (-> Text ..Handler)
+  (function (_ analyse args)
+    (do compiler.Monad<Operation>
+      [[var-id varT] (typeA.with-env tc.var)]
+      ((trinary (type (Atom varT)) varT varT Bool extension)
+       analyse args))))
+
+(def: bundle/atom
+  ///.Bundle
+  (<| (///bundle.prefix "atom")
+      (|> ///.fresh
+          (///bundle.install "new" atom-new)
+          (///bundle.install "read" atom-read)
+          (///bundle.install "compare-and-swap" atom//compare-and-swap)
+          )))
+
+(def: (box//new extension)
+  (-> Text ..Handler)
+  (function (_ analyse args)
+    (case args
+      (^ (list initC))
+      (do compiler.Monad<Operation>
+        [[var-id varT] (typeA.with-env tc.var)
+         _ (typeA.infer (type (All [!] (Box ! varT))))
+         initA (typeA.with-type varT
+                 (analyse initC))]
+        (wrap (#///.Extension extension (list initA))))
+      
+      _
+      (lang.throw ///bundle.incorrect-arity [extension +1 (list.size args)]))))
+
+(def: (box//read extension)
+  (-> Text ..Handler)
+  (function (_ analyse args)
+    (do compiler.Monad<Operation>
+      [[thread-id threadT] (typeA.with-env tc.var)
+       [var-id varT] (typeA.with-env tc.var)]
+      ((unary (type (Box threadT varT)) varT extension)
+       analyse args))))
+
+(def: (box//write extension)
+  (-> Text ..Handler)
+  (function (_ analyse args)
+    (do compiler.Monad<Operation>
+      [[thread-id threadT] (typeA.with-env tc.var)
+       [var-id varT] (typeA.with-env tc.var)]
+      ((binary varT (type (Box threadT varT)) Any extension)
+       analyse args))))
+
+(def: bundle/box
+  ///.Bundle
+  (<| (///bundle.prefix "box")
+      (|> ///.fresh
+          (///bundle.install "new" box//new)
+          (///bundle.install "read" box//read)
+          (///bundle.install "write" box//write)
+          )))
+
+(def: bundle/process
+  ///.Bundle
+  (<| (///bundle.prefix "process")
+      (|> ///.fresh
+          (///bundle.install "parallelism" (nullary Nat))
+          (///bundle.install "schedule" (binary Nat (type (IO Any)) Any))
+          )))
+
+(def: #export bundle
+  ///.Bundle
+  (<| (///bundle.prefix "lux")
+      (|> ///.fresh
+          (dict.merge bundle/lux)
+          (dict.merge bundle/bit)
+          (dict.merge bundle/int)
+          (dict.merge bundle/deg)
+          (dict.merge bundle/frac)
+          (dict.merge bundle/text)
+          (dict.merge bundle/array)
+          (dict.merge bundle/math)
+          (dict.merge bundle/atom)
+          (dict.merge bundle/box)
+          (dict.merge bundle/process)
+          (dict.merge bundle/io))
+      ))
diff --git a/stdlib/source/lux/lang/extension/analysis/host.jvm.lux b/stdlib/source/lux/lang/compiler/extension/analysis/host.jvm.lux
index 56da166c5..56da166c5 100644
--- a/stdlib/source/lux/lang/extension/analysis/host.jvm.lux
+++ b/stdlib/source/lux/lang/compiler/extension/analysis/host.jvm.lux
diff --git a/stdlib/source/lux/lang/compiler/extension/bundle.lux b/stdlib/source/lux/lang/compiler/extension/bundle.lux
new file mode 100644
index 000000000..ff4bd66ad
--- /dev/null
+++ b/stdlib/source/lux/lang/compiler/extension/bundle.lux
@@ -0,0 +1,31 @@
+(.module:
+  lux
+  (lux (control [monad #+ do]
+                ["ex" exception #+ exception:])
+       (data [text]
+             text/format
+             (coll [list "list/" Functor<List>]
+                   (dictionary ["dict" unordered #+ Dict]))))
+  [//])
+
+(exception: #export (incorrect-arity {name Text} {arity Nat} {args Nat})
+  (ex.report ["Extension" (%t name)]
+             ["Expected arity" (|> arity .int %i)]
+             ["Actual arity" (|> args .int %i)]))
+
+(exception: #export (invalid-syntax {name Text})
+  (ex.report ["Extension" name]))
+
+## [Utils]
+(def: #export (install name anonymous)
+  (All [s i o]
+    (-> Text (-> Text (//.Handler s i o))
+        (-> (//.Bundle s i o) (//.Bundle s i o))))
+  (dict.put name anonymous))
+
+(def: #export (prefix prefix)
+  (All [s i o]
+    (-> Text (-> (//.Bundle s i o) (//.Bundle s i o))))
+  (|>> dict.entries
+       (list/map (function (_ [key val]) [(format prefix " " key) val]))
+       (dict.from-list text.Hash<Text>)))
diff --git a/stdlib/source/lux/lang/extension/synthesis.lux b/stdlib/source/lux/lang/compiler/extension/synthesis.lux
index c48f3e3a5..c48f3e3a5 100644
--- a/stdlib/source/lux/lang/extension/synthesis.lux
+++ b/stdlib/source/lux/lang/compiler/extension/synthesis.lux
diff --git a/stdlib/source/lux/lang/extension/translation.lux b/stdlib/source/lux/lang/compiler/extension/translation.lux
index bc95ed1f4..bc95ed1f4 100644
--- a/stdlib/source/lux/lang/extension/translation.lux
+++ b/stdlib/source/lux/lang/compiler/extension/translation.lux
diff --git a/stdlib/source/lux/lang/compiler/init.lux b/stdlib/source/lux/lang/compiler/init.lux
new file mode 100644
index 000000000..92a066b7e
--- /dev/null
+++ b/stdlib/source/lux/lang/compiler/init.lux
@@ -0,0 +1,51 @@
+(.module:
+  lux
+  [///]
+  [///host])
+
+(def: #export (cursor file)
+  (-> Text Cursor)
+  [file +1 +0])
+
+(def: #export (source file code)
+  (-> Text Text Source)
+  [(cursor file) +0 code])
+
+(def: dummy-source
+  Source
+  [.dummy-cursor +0 ""])
+
+(def: #export type-context
+  Type-Context
+  {#.ex-counter +0
+   #.var-counter +0
+   #.var-bindings (list)})
+
+(`` (def: #export info
+      Info
+      {#.target  (for {(~~ (static ///host.common-lisp)) ///host.common-lisp
+                       (~~ (static ///host.js))          ///host.js
+                       (~~ (static ///host.jvm))         ///host.jvm
+                       (~~ (static ///host.lua))         ///host.lua
+                       (~~ (static ///host.php))         ///host.php
+                       (~~ (static ///host.python))      ///host.python
+                       (~~ (static ///host.r))           ///host.r
+                       (~~ (static ///host.ruby))        ///host.ruby
+                       (~~ (static ///host.scheme))      ///host.scheme})
+       #.version ///.version
+       #.mode    #.Build}))
+
+(def: #export (compiler host)
+  (-> Any Lux)
+  {#.info            ..info
+   #.source          dummy-source
+   #.cursor          .dummy-cursor
+   #.current-module  #.None
+   #.modules         (list)
+   #.scopes          (list)
+   #.type-context    ..type-context
+   #.expected        #.None
+   #.seed            +0
+   #.scope-type-vars (list)
+   #.extensions      []
+   #.host            host})
diff --git a/stdlib/source/lux/lang/synthesis.lux b/stdlib/source/lux/lang/compiler/synthesis.lux
index 1bf06cdd0..eece3c7ab 100644
--- a/stdlib/source/lux/lang/synthesis.lux
+++ b/stdlib/source/lux/lang/compiler/synthesis.lux
@@ -3,10 +3,9 @@
   (lux (control [monad #+ do])
        (data [error #+ Error]
              (coll (dictionary ["dict" unordered #+ Dict]))))
-  [// #+ Extension]
-  [//reference #+ Register Variable Reference]
-  [//analysis #+ Environment Arity Analysis]
-  [//compiler #+ Operation Compiler])
+  [///reference #+ Register Variable Reference]
+  [// #+ Operation Compiler]
+  [//analysis #+ Environment Arity Analysis])
 
 (type: #export Resolver (Dict Variable Variable))
 
@@ -18,7 +17,7 @@
 
 (def: #export fresh-resolver
   Resolver
-  (dict.new //reference.Hash<Variable>))
+  (dict.new ///reference.Hash<Variable>))
 
 (def: #export init
   State
@@ -88,8 +87,7 @@
   (#Primitive Primitive)
   (#Structure (Structure Synthesis))
   (#Reference Reference)
-  (#Control (Control Synthesis))
-  (#Extension (Extension Synthesis)))
+  (#Control (Control Synthesis)))
 
 (type: #export Path
   (Path' Synthesis))
@@ -151,7 +149,7 @@
 (do-template [<name> <value>]
   [(def: #export <name>
      (All [a] (-> (Operation ..State a) (Operation ..State a)))
-     (//compiler.localized (set@ #direct? <value>)))]
+     (//.localized (set@ #direct? <value>)))]
 
   [indirectly false]
   [directly   true]
@@ -160,7 +158,7 @@
 (do-template [<name> <type> <tag>]
   [(def: #export (<name> value)
      (-> <type> (All [a] (-> (Operation ..State a) (Operation ..State a))))
-     (//compiler.localized (set@ <tag> value)))]
+     (//.localized (set@ <tag> value)))]
 
   [with-scope-arity Arity    #scope-arity]
   [with-resolver    Resolver #resolver]
@@ -171,10 +169,10 @@
   (All [o]
     (-> Arity Resolver
         (-> (Operation ..State o) (Operation ..State o))))
-  (//compiler.with-state {#scope-arity arity
-                          #resolver resolver
-                          #direct? true
-                          #locals arity}))
+  (//.with-state {#scope-arity arity
+                  #resolver resolver
+                  #direct? true
+                  #locals arity}))
 
 (do-template [<name> <tag> <type>]
   [(def: #export <name>
@@ -190,7 +188,7 @@
 
 (def: #export with-new-local
   (All [a] (-> (Operation ..State a) (Operation ..State a)))
-  (<<| (do //compiler.Monad<Operation>
+  (<<| (do //.Monad<Operation>
          [locals ..locals])
        (..with-locals (inc locals))))
 
@@ -220,8 +218,8 @@
           <tag>
           content))]
 
-  [variable/local   //reference.local]
-  [variable/foreign //reference.foreign]
+  [variable/local   ///reference.local]
+  [variable/foreign ///reference.foreign]
   )
 
 (do-template [<name> <family> <tag>]
diff --git a/stdlib/source/lux/lang/synthesis/case.lux b/stdlib/source/lux/lang/compiler/synthesis/case.lux
index b7f224168..b7f224168 100644
--- a/stdlib/source/lux/lang/synthesis/case.lux
+++ b/stdlib/source/lux/lang/compiler/synthesis/case.lux
diff --git a/stdlib/source/lux/lang/synthesis/expression.lux b/stdlib/source/lux/lang/compiler/synthesis/expression.lux
index 52ea33805..52ea33805 100644
--- a/stdlib/source/lux/lang/synthesis/expression.lux
+++ b/stdlib/source/lux/lang/compiler/synthesis/expression.lux
diff --git a/stdlib/source/lux/lang/synthesis/function.lux b/stdlib/source/lux/lang/compiler/synthesis/function.lux
index 35b9e047e..35b9e047e 100644
--- a/stdlib/source/lux/lang/synthesis/function.lux
+++ b/stdlib/source/lux/lang/compiler/synthesis/function.lux
diff --git a/stdlib/source/lux/lang/synthesis/loop.lux b/stdlib/source/lux/lang/compiler/synthesis/loop.lux
index eb57eb7ad..eb57eb7ad 100644
--- a/stdlib/source/lux/lang/synthesis/loop.lux
+++ b/stdlib/source/lux/lang/compiler/synthesis/loop.lux
diff --git a/stdlib/source/lux/lang/translation.lux b/stdlib/source/lux/lang/compiler/translation.lux
index c117bc019..c117bc019 100644
--- a/stdlib/source/lux/lang/translation.lux
+++ b/stdlib/source/lux/lang/compiler/translation.lux
diff --git a/stdlib/source/lux/lang/translation/scheme/case.jvm.lux b/stdlib/source/lux/lang/compiler/translation/scheme/case.jvm.lux
index e5d12a005..e5d12a005 100644
--- a/stdlib/source/lux/lang/translation/scheme/case.jvm.lux
+++ b/stdlib/source/lux/lang/compiler/translation/scheme/case.jvm.lux
diff --git a/stdlib/source/lux/lang/translation/scheme/expression.jvm.lux b/stdlib/source/lux/lang/compiler/translation/scheme/expression.jvm.lux
index 96bb17126..96bb17126 100644
--- a/stdlib/source/lux/lang/translation/scheme/expression.jvm.lux
+++ b/stdlib/source/lux/lang/compiler/translation/scheme/expression.jvm.lux
diff --git a/stdlib/source/lux/lang/translation/scheme/extension.jvm.lux b/stdlib/source/lux/lang/compiler/translation/scheme/extension.jvm.lux
index 6475caf68..6475caf68 100644
--- a/stdlib/source/lux/lang/translation/scheme/extension.jvm.lux
+++ b/stdlib/source/lux/lang/compiler/translation/scheme/extension.jvm.lux
diff --git a/stdlib/source/lux/lang/translation/scheme/extension/common.jvm.lux b/stdlib/source/lux/lang/compiler/translation/scheme/extension/common.jvm.lux
index 140045aaf..140045aaf 100644
--- a/stdlib/source/lux/lang/translation/scheme/extension/common.jvm.lux
+++ b/stdlib/source/lux/lang/compiler/translation/scheme/extension/common.jvm.lux
diff --git a/stdlib/source/lux/lang/translation/scheme/function.jvm.lux b/stdlib/source/lux/lang/compiler/translation/scheme/function.jvm.lux
index 11c64076c..11c64076c 100644
--- a/stdlib/source/lux/lang/translation/scheme/function.jvm.lux
+++ b/stdlib/source/lux/lang/compiler/translation/scheme/function.jvm.lux
diff --git a/stdlib/source/lux/lang/translation/scheme/loop.jvm.lux b/stdlib/source/lux/lang/compiler/translation/scheme/loop.jvm.lux
index 6f305336e..6f305336e 100644
--- a/stdlib/source/lux/lang/translation/scheme/loop.jvm.lux
+++ b/stdlib/source/lux/lang/compiler/translation/scheme/loop.jvm.lux
diff --git a/stdlib/source/lux/lang/translation/scheme/primitive.jvm.lux b/stdlib/source/lux/lang/compiler/translation/scheme/primitive.jvm.lux
index ac775fa82..ac775fa82 100644
--- a/stdlib/source/lux/lang/translation/scheme/primitive.jvm.lux
+++ b/stdlib/source/lux/lang/compiler/translation/scheme/primitive.jvm.lux
diff --git a/stdlib/source/lux/lang/translation/scheme/reference.jvm.lux b/stdlib/source/lux/lang/compiler/translation/scheme/reference.jvm.lux
index 453d4edb6..453d4edb6 100644
--- a/stdlib/source/lux/lang/translation/scheme/reference.jvm.lux
+++ b/stdlib/source/lux/lang/compiler/translation/scheme/reference.jvm.lux
diff --git a/stdlib/source/lux/lang/translation/scheme/runtime.jvm.lux b/stdlib/source/lux/lang/compiler/translation/scheme/runtime.jvm.lux
index b30aff3a2..b30aff3a2 100644
--- a/stdlib/source/lux/lang/translation/scheme/runtime.jvm.lux
+++ b/stdlib/source/lux/lang/compiler/translation/scheme/runtime.jvm.lux
diff --git a/stdlib/source/lux/lang/translation/scheme/structure.jvm.lux b/stdlib/source/lux/lang/compiler/translation/scheme/structure.jvm.lux
index a11434594..a11434594 100644
--- a/stdlib/source/lux/lang/translation/scheme/structure.jvm.lux
+++ b/stdlib/source/lux/lang/compiler/translation/scheme/structure.jvm.lux
diff --git a/stdlib/source/lux/lang/extension.lux b/stdlib/source/lux/lang/extension.lux
deleted file mode 100644
index 7edac52c3..000000000
--- a/stdlib/source/lux/lang/extension.lux
+++ /dev/null
@@ -1,131 +0,0 @@
-(.module:
-  lux
-  (lux (control [monad #+ do]
-                ["ex" exception #+ exception:])
-       (data ["e" error]
-             [text]
-             (coll (dictionary ["dict" unordered #+ Dict]))))
-  [// #+ Eval]
-  [//compiler #+ Operation Compiler]
-  [//analysis #+ Analyser]
-  [//synthesis #+ Synthesizer]
-  [//translation #+ Translator])
-
-(do-template [<name>]
-  [(exception: #export (<name> {extension Text})
-     extension)]
-
-  [unknown-analysis]
-  [unknown-synthesis]
-  [unknown-translation]
-  [unknown-statement]
-
-  [cannot-define-analysis-more-than-once]
-  [cannot-define-synthesis-more-than-once]
-  [cannot-define-translation-more-than-once]
-  [cannot-define-statement-more-than-once]
-  )
-
-(type: #export Analysis
-  (-> Analyser Eval
-      (Compiler .Lux
-                (List Code)
-                //analysis.Analysis)))
-
-(type: #export Synthesis
-  (-> Synthesizer
-      (Compiler //synthesis.State
-                (List //analysis.Analysis)
-                //synthesis.Synthesis)))
-
-(type: #export (Translation anchor code)
-  (-> (Translator anchor code)
-      (Compiler (//translation.State anchor code)
-                (List //synthesis.Synthesis)
-                code)))
-
-(type: #export Statement
-  (-> (List Code) (Meta Any)))
-
-(type: #export (Extension e)
-  (Dict Text e))
-
-(type: #export Extensions
-  {#analysis (Extension Analysis)
-   #synthesis (Extension Synthesis)
-   #translation (Extension Translation)
-   #statement (Extension Statement)})
-
-(def: #export fresh
-  Extensions
-  {#analysis (dict.new text.Hash<Text>)
-   #synthesis (dict.new text.Hash<Text>)
-   #translation (dict.new text.Hash<Text>)
-   #statement (dict.new text.Hash<Text>)})
-
-(def: get
-  (Meta Extensions)
-  (function (_ compiler)
-    (#e.Success [compiler
-                 (|> compiler (get@ #.extensions) (:! Extensions))])))
-
-(def: (set extensions)
-  (-> Extensions (Meta Any))
-  (function (_ compiler)
-    (#e.Success [(set@ #.extensions (:! Nothing extensions) compiler)
-                 []])))
-
-(do-template [<name> <type> <category> <exception>]
-  [(def: #export (<name> name)
-     (-> Text (Meta <type>))
-     (do //compiler.Monad<Operation>
-       [extensions ..get]
-       (case (dict.get name (get@ <category> extensions))
-         (#.Some extension)
-         (wrap extension)
-
-         #.None
-         (//compiler.throw <exception> name))))]
-
-  [find-analysis    Analysis    #analysis    unknown-analysis]
-  [find-synthesis   Synthesis   #synthesis   unknown-synthesis]
-  [find-translation Translation #translation unknown-translation]
-  [find-statement   Statement   #statement   unknown-statement]
-  )
-
-(def: #export empty
-  (All [e] (Extension e))
-  (dict.new text.Hash<Text>))
-
-(do-template [<params> <all> <state> <type> <category>]
-  [(def: #export <all>
-     (All <params> (Operation <state> (Extension <type>)))
-     (|> ..get
-         (:: //compiler.Monad<Operation> map (get@ <category>))))]
-
-  [[]            all-analyses     .Lux
-   Analysis    #analysis]
-  [[]            all-syntheses    //synthesis.State
-   Synthesis   #synthesis]
-  [[anchor code] all-translations (//translation.State anchor code)
-   Translation #translation]
-  [[]            all-statements   Any
-   Statement   #statement]
-  )
-
-(do-template [<name> <type> <category> <exception>]
-  [(def: #export (<name> name extension)
-     (-> Text <type> (Meta Any))
-     (do //compiler.Monad<Operation>
-       [extensions ..get
-        _ (if (not (dict.contains? name (get@ <category> extensions)))
-            (wrap [])
-            (//compiler.throw <exception> name))
-        _ (..set (update@ <category> (dict.put name extension) extensions))]
-       (wrap [])))]
-
-  [install-analysis    Analysis    #analysis    cannot-define-analysis-more-than-once]
-  [install-synthesis   Synthesis   #synthesis   cannot-define-synthesis-more-than-once]
-  [install-translation Translation #translation cannot-define-translation-more-than-once]
-  [install-statement   Statement   #statement   cannot-define-statement-more-than-once]
-  )
diff --git a/stdlib/source/lux/lang/extension/analysis/common.lux b/stdlib/source/lux/lang/extension/analysis/common.lux
deleted file mode 100644
index 3faae601b..000000000
--- a/stdlib/source/lux/lang/extension/analysis/common.lux
+++ /dev/null
@@ -1,444 +0,0 @@
-(.module:
-  lux
-  (lux (control [monad #+ do]
-                ["ex" exception #+ exception:]
-                [thread])
-       (concurrency [atom #+ Atom])
-       (data [text]
-             text/format
-             (coll [list "list/" Functor<List>]
-                   [array]
-                   (dictionary ["dict" unordered #+ Dict])))
-       [macro]
-       (macro [code])
-       [lang]
-       (lang (type ["tc" check])
-             [".L" analysis]
-             (analysis [".A" type]
-                       [".A" case]
-                       [".A" function]))
-       [io])
-  [///])
-
-(exception: #export (incorrect-extension-arity {name Text} {arity Nat} {args Nat})
-  (ex.report ["Extension" (%t name)]
-             ["Expected arity" (|> arity .int %i)]
-             ["Actual arity" (|> args .int %i)]))
-
-(exception: #export (invalid-syntax {name Text} {arguments (List Code)})
-  (ex.report ["Extension" name]
-             ["Inputs" (|> arguments
-                           list.enumerate
-                           (list/map (function (_ [idx argC])
-                                       (format "\n  " (%n idx) " " (%code argC))))
-                           (text.join-with ""))]))
-
-## [Utils]
-(type: #export Bundle
-  (Dict Text (-> Text ///.Analysis)))
-
-(def: #export (install name unnamed)
-  (-> Text (-> Text ///.Analysis)
-      (-> Bundle Bundle))
-  (dict.put name unnamed))
-
-(def: #export (prefix prefix bundle)
-  (-> Text Bundle Bundle)
-  (|> bundle
-      dict.entries
-      (list/map (function (_ [key val]) [(format prefix " " key) val]))
-      (dict.from-list text.Hash<Text>)))
-
-(def: (simple proc inputsT+ outputT)
-  (-> Text (List Type) Type ///.Analysis)
-  (let [num-expected (list.size inputsT+)]
-    (function (_ analyse eval args)
-      (let [num-actual (list.size args)]
-        (if (n/= num-expected num-actual)
-          (do macro.Monad<Meta>
-            [_ (typeA.infer outputT)
-             argsA (monad.map @
-                              (function (_ [argT argC])
-                                (typeA.with-type argT
-                                  (analyse argC)))
-                              (list.zip2 inputsT+ args))]
-            (wrap (#analysisL.Extension proc argsA)))
-          (lang.throw incorrect-extension-arity [proc num-expected num-actual]))))))
-
-(def: #export (nullary valueT proc)
-  (-> Type Text ///.Analysis)
-  (simple proc (list) valueT))
-
-(def: #export (unary inputT outputT proc)
-  (-> Type Type Text ///.Analysis)
-  (simple proc (list inputT) outputT))
-
-(def: #export (binary subjectT paramT outputT proc)
-  (-> Type Type Type Text ///.Analysis)
-  (simple proc (list subjectT paramT) outputT))
-
-(def: #export (trinary subjectT param0T param1T outputT proc)
-  (-> Type Type Type Type Text ///.Analysis)
-  (simple proc (list subjectT param0T param1T) outputT))
-
-## [Analysers]
-## "lux is" represents reference/pointer equality.
-(def: (lux//is proc)
-  (-> Text ///.Analysis)
-  (function (_ analyse eval args)
-    (do macro.Monad<Meta>
-      [[var-id varT] (typeA.with-env tc.var)]
-      ((binary varT varT Bool proc)
-       analyse eval args))))
-
-## "lux try" provides a simple way to interact with the host platform's
-## error-handling facilities.
-(def: (lux//try proc)
-  (-> Text ///.Analysis)
-  (function (_ analyse eval args)
-    (case args
-      (^ (list opC))
-      (do macro.Monad<Meta>
-        [[var-id varT] (typeA.with-env tc.var)
-         _ (typeA.infer (type (Either Text varT)))
-         opA (typeA.with-type (type (io.IO varT))
-               (analyse opC))]
-        (wrap (#analysisL.Extension proc (list opA))))
-      
-      _
-      (lang.throw incorrect-extension-arity [proc +1 (list.size args)]))))
-
-(def: (lux//function proc)
-  (-> Text ///.Analysis)
-  (function (_ analyse eval args)
-    (case args
-      (^ (list [_ (#.Symbol ["" func-name])]
-               [_ (#.Symbol ["" arg-name])]
-               body))
-      (functionA.function analyse func-name arg-name body)
-      
-      _
-      (lang.throw incorrect-extension-arity [proc +3 (list.size args)]))))
-
-(def: (lux//case proc)
-  (-> Text ///.Analysis)
-  (function (_ analyse eval args)
-    (case args
-      (^ (list input [_ (#.Record branches)]))
-      (caseA.case analyse input branches)
-      
-      _
-      (lang.throw incorrect-extension-arity [proc +2 (list.size args)]))))
-
-(def: (lux//in-module proc)
-  (-> Text ///.Analysis)
-  (function (_ analyse eval argsC+)
-    (case argsC+
-      (^ (list [_ (#.Text module-name)] exprC))
-      (lang.with-current-module module-name
-        (analyse exprC))
-      
-      _
-      (lang.throw invalid-syntax [proc argsC+]))))
-
-(do-template [<name> <type>]
-  [(def: (<name> proc)
-     (-> Text ///.Analysis)
-     (function (_ analyse eval args)
-       (case args
-         (^ (list typeC valueC))
-         (do macro.Monad<Meta>
-           [actualT (eval Type typeC)
-            _ (typeA.infer (:! Type actualT))]
-           (typeA.with-type <type>
-             (analyse valueC)))
-         
-         _
-         (lang.throw incorrect-extension-arity [proc +2 (list.size args)]))))]
-
-  [lux//check  (:! Type actualT)]
-  [lux//coerce Any]
-  )
-
-(def: (lux//check//type proc)
-  (-> Text ///.Analysis)
-  (function (_ analyse eval args)
-    (case args
-      (^ (list valueC))
-      (do macro.Monad<Meta>
-        [_ (typeA.infer Type)
-         valueA (typeA.with-type Type
-                  (analyse valueC))]
-        (wrap valueA))
-      
-      _
-      (lang.throw incorrect-extension-arity [proc +1 (list.size args)]))))
-
-(def: lux-procs
-  Bundle
-  (|> (dict.new text.Hash<Text>)
-      (install "is" lux//is)
-      (install "try" lux//try)
-      (install "function" lux//function)
-      (install "case" lux//case)
-      (install "check" lux//check)
-      (install "coerce" lux//coerce)
-      (install "check type" lux//check//type)
-      (install "in-module" lux//in-module)))
-
-(def: io-procs
-  Bundle
-  (<| (prefix "io")
-      (|> (dict.new text.Hash<Text>)
-          (install "log" (unary Text Any))
-          (install "error" (unary Text Nothing))
-          (install "exit" (unary Int Nothing))
-          (install "current-time" (nullary Int)))))
-
-(def: bit-procs
-  Bundle
-  (<| (prefix "bit")
-      (|> (dict.new text.Hash<Text>)
-          (install "and" (binary Nat Nat Nat))
-          (install "or" (binary Nat Nat Nat))
-          (install "xor" (binary Nat Nat Nat))
-          (install "left-shift" (binary Nat Nat Nat))
-          (install "logical-right-shift" (binary Nat Nat Nat))
-          (install "arithmetic-right-shift" (binary Int Nat Int))
-          )))
-
-(def: int-procs
-  Bundle
-  (<| (prefix "int")
-      (|> (dict.new text.Hash<Text>)
-          (install "+" (binary Int Int Int))
-          (install "-" (binary Int Int Int))
-          (install "*" (binary Int Int Int))
-          (install "/" (binary Int Int Int))
-          (install "%" (binary Int Int Int))
-          (install "=" (binary Int Int Bool))
-          (install "<" (binary Int Int Bool))
-          (install "min" (nullary Int))
-          (install "max" (nullary Int))
-          (install "to-nat" (unary Int Nat))
-          (install "to-frac" (unary Int Frac))
-          (install "char" (unary Int Text)))))
-
-(def: deg-procs
-  Bundle
-  (<| (prefix "deg")
-      (|> (dict.new text.Hash<Text>)
-          (install "+" (binary Deg Deg Deg))
-          (install "-" (binary Deg Deg Deg))
-          (install "*" (binary Deg Deg Deg))
-          (install "/" (binary Deg Deg Deg))
-          (install "%" (binary Deg Deg Deg))
-          (install "=" (binary Deg Deg Bool))
-          (install "<" (binary Deg Deg Bool))
-          (install "scale" (binary Deg Nat Deg))
-          (install "reciprocal" (binary Deg Nat Deg))
-          (install "min" (nullary Deg))
-          (install "max" (nullary Deg))
-          (install "to-frac" (unary Deg Frac)))))
-
-(def: frac-procs
-  Bundle
-  (<| (prefix "frac")
-      (|> (dict.new text.Hash<Text>)
-          (install "+" (binary Frac Frac Frac))
-          (install "-" (binary Frac Frac Frac))
-          (install "*" (binary Frac Frac Frac))
-          (install "/" (binary Frac Frac Frac))
-          (install "%" (binary Frac Frac Frac))
-          (install "=" (binary Frac Frac Bool))
-          (install "<" (binary Frac Frac Bool))
-          (install "smallest" (nullary Frac))
-          (install "min" (nullary Frac))
-          (install "max" (nullary Frac))
-          (install "not-a-number" (nullary Frac))
-          (install "positive-infinity" (nullary Frac))
-          (install "negative-infinity" (nullary Frac))
-          (install "to-deg" (unary Frac Deg))
-          (install "to-int" (unary Frac Int))
-          (install "encode" (unary Frac Text))
-          (install "decode" (unary Text (type (Maybe Frac)))))))
-
-(def: text-procs
-  Bundle
-  (<| (prefix "text")
-      (|> (dict.new text.Hash<Text>)
-          (install "=" (binary Text Text Bool))
-          (install "<" (binary Text Text Bool))
-          (install "concat" (binary Text Text Text))
-          (install "index" (trinary Text Text Nat (type (Maybe Nat))))
-          (install "size" (unary Text Nat))
-          (install "hash" (unary Text Nat))
-          (install "replace-once" (trinary Text Text Text Text))
-          (install "replace-all" (trinary Text Text Text Text))
-          (install "char" (binary Text Nat (type (Maybe Nat))))
-          (install "clip" (trinary Text Nat Nat (type (Maybe Text))))
-          )))
-
-(def: (array//get proc)
-  (-> Text ///.Analysis)
-  (function (_ analyse eval args)
-    (do macro.Monad<Meta>
-      [[var-id varT] (typeA.with-env tc.var)]
-      ((binary (type (Array varT)) Nat (type (Maybe varT)) proc)
-       analyse eval args))))
-
-(def: (array//put proc)
-  (-> Text ///.Analysis)
-  (function (_ analyse eval args)
-    (do macro.Monad<Meta>
-      [[var-id varT] (typeA.with-env tc.var)]
-      ((trinary (type (Array varT)) Nat varT (type (Array varT)) proc)
-       analyse eval args))))
-
-(def: (array//remove proc)
-  (-> Text ///.Analysis)
-  (function (_ analyse eval args)
-    (do macro.Monad<Meta>
-      [[var-id varT] (typeA.with-env tc.var)]
-      ((binary (type (Array varT)) Nat (type (Array varT)) proc)
-       analyse eval args))))
-
-(def: array-procs
-  Bundle
-  (<| (prefix "array")
-      (|> (dict.new text.Hash<Text>)
-          (install "new" (unary Nat Array))
-          (install "get" array//get)
-          (install "put" array//put)
-          (install "remove" array//remove)
-          (install "size" (unary (type (Ex [a] (Array a))) Nat))
-          )))
-
-(def: math-procs
-  Bundle
-  (<| (prefix "math")
-      (|> (dict.new text.Hash<Text>)
-          (install "cos" (unary Frac Frac))
-          (install "sin" (unary Frac Frac))
-          (install "tan" (unary Frac Frac))
-          (install "acos" (unary Frac Frac))
-          (install "asin" (unary Frac Frac))
-          (install "atan" (unary Frac Frac))
-          (install "cosh" (unary Frac Frac))
-          (install "sinh" (unary Frac Frac))
-          (install "tanh" (unary Frac Frac))
-          (install "exp" (unary Frac Frac))
-          (install "log" (unary Frac Frac))
-          (install "ceil" (unary Frac Frac))
-          (install "floor" (unary Frac Frac))
-          (install "round" (unary Frac Frac))
-          (install "atan2" (binary Frac Frac Frac))
-          (install "pow" (binary Frac Frac Frac))
-          )))
-
-(def: (atom-new proc)
-  (-> Text ///.Analysis)
-  (function (_ analyse eval args)
-    (case args
-      (^ (list initC))
-      (do macro.Monad<Meta>
-        [[var-id varT] (typeA.with-env tc.var)
-         _ (typeA.infer (type (Atom varT)))
-         initA (typeA.with-type varT
-                 (analyse initC))]
-        (wrap (#analysisL.Extension proc (list initA))))
-      
-      _
-      (lang.throw incorrect-extension-arity [proc +1 (list.size args)]))))
-
-(def: (atom-read proc)
-  (-> Text ///.Analysis)
-  (function (_ analyse eval args)
-    (do macro.Monad<Meta>
-      [[var-id varT] (typeA.with-env tc.var)]
-      ((unary (type (Atom varT)) varT proc)
-       analyse eval args))))
-
-(def: (atom//compare-and-swap proc)
-  (-> Text ///.Analysis)
-  (function (_ analyse eval args)
-    (do macro.Monad<Meta>
-      [[var-id varT] (typeA.with-env tc.var)]
-      ((trinary (type (Atom varT)) varT varT Bool proc)
-       analyse eval args))))
-
-(def: atom-procs
-  Bundle
-  (<| (prefix "atom")
-      (|> (dict.new text.Hash<Text>)
-          (install "new" atom-new)
-          (install "read" atom-read)
-          (install "compare-and-swap" atom//compare-and-swap)
-          )))
-
-(def: (box//new proc)
-  (-> Text ///.Analysis)
-  (function (_ analyse eval args)
-    (case args
-      (^ (list initC))
-      (do macro.Monad<Meta>
-        [[var-id varT] (typeA.with-env tc.var)
-         _ (typeA.infer (type (All [!] (thread.Box ! varT))))
-         initA (typeA.with-type varT
-                 (analyse initC))]
-        (wrap (#analysisL.Extension proc (list initA))))
-      
-      _
-      (lang.throw incorrect-extension-arity [proc +1 (list.size args)]))))
-
-(def: (box//read proc)
-  (-> Text ///.Analysis)
-  (function (_ analyse eval args)
-    (do macro.Monad<Meta>
-      [[thread-id threadT] (typeA.with-env tc.var)
-       [var-id varT] (typeA.with-env tc.var)]
-      ((unary (type (thread.Box threadT varT)) varT proc)
-       analyse eval args))))
-
-(def: (box//write proc)
-  (-> Text ///.Analysis)
-  (function (_ analyse eval args)
-    (do macro.Monad<Meta>
-      [[thread-id threadT] (typeA.with-env tc.var)
-       [var-id varT] (typeA.with-env tc.var)]
-      ((binary varT (type (thread.Box threadT varT)) Any proc)
-       analyse eval args))))
-
-(def: box-procs
-  Bundle
-  (<| (prefix "box")
-      (|> (dict.new text.Hash<Text>)
-          (install "new" box//new)
-          (install "read" box//read)
-          (install "write" box//write)
-          )))
-
-(def: process-procs
-  Bundle
-  (<| (prefix "process")
-      (|> (dict.new text.Hash<Text>)
-          (install "parallelism-level" (nullary Nat))
-          (install "schedule" (binary Nat (type (io.IO Any)) Any))
-          )))
-
-(def: #export extensions
-  Bundle
-  (<| (prefix "lux")
-      (|> (dict.new text.Hash<Text>)
-          (dict.merge lux-procs)
-          (dict.merge bit-procs)
-          (dict.merge int-procs)
-          (dict.merge deg-procs)
-          (dict.merge frac-procs)
-          (dict.merge text-procs)
-          (dict.merge array-procs)
-          (dict.merge math-procs)
-          (dict.merge atom-procs)
-          (dict.merge box-procs)
-          (dict.merge process-procs)
-          (dict.merge io-procs))))
diff --git a/stdlib/source/lux/lang/target.lux b/stdlib/source/lux/lang/host.lux
index ee0eee74d..218de67a4 100644
--- a/stdlib/source/lux/lang/target.lux
+++ b/stdlib/source/lux/lang/host.lux
@@ -1,10 +1,10 @@
 (.module:
   lux)
 
-(type: #export Target Text)
+(type: #export Host Text)
 
 (do-template [<name> <value>]
-  [(def: #export <name> Target <value>)]
+  [(def: #export <name> Host <value>)]
 
   [common-lisp "Common Lisp"]
   [js          "JavaScript"]
diff --git a/stdlib/source/lux/lang/init.lux b/stdlib/source/lux/lang/init.lux
deleted file mode 100644
index 40a7fc69c..000000000
--- a/stdlib/source/lux/lang/init.lux
+++ /dev/null
@@ -1,61 +0,0 @@
-(.module:
-  lux
-  [//]
-  (// ["//." target]
-      [".L" extension]
-      (extension [".E" analysis]
-                 [".E" synthesis]
-                 [".E" translation]
-                 ## [".E" statement]
-                 )))
-
-(def: #export (cursor file)
-  (-> Text Cursor)
-  [file +1 +0])
-
-(def: #export (source file code)
-  (-> Text Text Source)
-  [(cursor file) +0 code])
-
-(def: dummy-source
-  Source
-  [.dummy-cursor +0 ""])
-
-(def: #export type-context
-  Type-Context
-  {#.ex-counter +0
-   #.var-counter +0
-   #.var-bindings (list)})
-
-(`` (def: #export info
-      Info
-      {#.target  (for {(~~ (static //target.common-lisp)) //target.common-lisp
-                       (~~ (static //target.js))          //target.js
-                       (~~ (static //target.jvm))         //target.jvm
-                       (~~ (static //target.lua))         //target.lua
-                       (~~ (static //target.php))         //target.php
-                       (~~ (static //target.python))      //target.python
-                       (~~ (static //target.r))           //target.r
-                       (~~ (static //target.ruby))        //target.ruby
-                       (~~ (static //target.scheme))      //target.scheme})
-       #.version //.version
-       #.mode    #.Build}))
-
-(def: #export (compiler host)
-  (-> Any Lux)
-  {#.info            ..info
-   #.source          dummy-source
-   #.cursor          .dummy-cursor
-   #.current-module  #.None
-   #.modules         (list)
-   #.scopes          (list)
-   #.type-context    ..type-context
-   #.expected        #.None
-   #.seed            +0
-   #.scope-type-vars (list)
-   #.extensions      {#extensionL.analysis analysisE.defaults
-                      #extensionL.synthesis synthesisE.defaults
-                      #extensionL.translation translationE.defaults
-                      #extensionL.statement (:!! []) ## statementE.defaults
-                      }
-   #.host            host})
diff --git a/stdlib/source/lux/lang/module.lux b/stdlib/source/lux/lang/module.lux
index 161fd073a..d6b66da74 100644
--- a/stdlib/source/lux/lang/module.lux
+++ b/stdlib/source/lux/lang/module.lux
@@ -9,7 +9,8 @@
              (coll [list "list/" Fold<List> Functor<List>]
                    (dictionary [plist])))
        [macro])
-  [//])
+  [//compiler]
+  (//compiler [analysis]))
 
 (type: #export Tag Text)
 
@@ -17,13 +18,13 @@
   module)
 
 (exception: #export (cannot-declare-tag-twice {module Text} {tag Text})
-  (format "Module: " module "\n"
-          "   Tag: " tag "\n"))
+  (ex.report ["Module" module]
+             ["Tag" tag]))
 
 (do-template [<name>]
   [(exception: #export (<name> {tags (List Text)} {owner Type})
-     (format "Tags: " (text.join-with " " tags) "\n"
-             "Type: " (%type owner) "\n"))]
+     (ex.report ["Tags" (text.join-with " " tags)]
+                ["Type" (%type owner)]))]
 
   [cannot-declare-tags-for-unnamed-type]
   [cannot-declare-tags-for-foreign-type]
@@ -33,16 +34,16 @@
   (%ident name))
 
 (exception: #export (can-only-change-state-of-active-module {module Text} {state Module-State})
-  (format "       Module: " module "\n"
-          "Desired state: " (case state
-                              #.Active   "Active"
-                              #.Compiled "Compiled"
-                              #.Cached   "Cached") "\n"))
+  (ex.report ["Module" module]
+             ["Desired state" (case state
+                                #.Active   "Active"
+                                #.Compiled "Compiled"
+                                #.Cached   "Cached")]))
 
 (exception: #export (cannot-set-module-annotations-more-than-once {module Text} {old Code} {new Code})
-  (format "         Module: " module "\n"
-          "Old annotations: " (%code old) "\n"
-          "New annotations: " (%code new) "\n"))
+  (ex.report ["Module" module]
+             ["Old annotations" (%code old)]
+             ["New annotations" (%code new)]))
 
 (def: (new hash)
   (-> Nat Module)
@@ -69,7 +70,7 @@
                      []]))
       
       (#.Some old)
-      (//.throw cannot-set-module-annotations-more-than-once [self-name old annotations]))))
+      (//compiler.throw cannot-set-module-annotations-more-than-once [self-name old annotations]))))
 
 (def: #export (import module)
   (-> Text (Meta Any))
@@ -119,7 +120,7 @@
                      []])
 
         (#.Some already-existing)
-        ((//.throw cannot-define-more-than-once [self-name name]) compiler)))))
+        ((//compiler.throw cannot-define-more-than-once [self-name name]) compiler)))))
 
 (def: #export (create hash name)
   (-> Nat Text (Meta []))
@@ -134,7 +135,7 @@
   (All [a] (-> Nat Text (Meta a) (Meta [Module a])))
   (do macro.Monad<Meta>
     [_ (create hash name)
-     output (//.with-current-module name
+     output (analysis.with-current-module name
               action)
      module (macro.find-module name)]
     (wrap [module output])))
@@ -153,11 +154,11 @@
                                    (plist.put module-name (set@ #.module-state <tag> module))
                                    compiler)
                           []])
-             ((//.throw can-only-change-state-of-active-module [module-name <tag>])
+             ((//compiler.throw can-only-change-state-of-active-module [module-name <tag>])
               compiler)))
 
          #.None
-         ((//.throw unknown-module module-name) compiler))))
+         ((//compiler.throw unknown-module module-name) compiler))))
    
    (def: #export (<asker> module-name)
      (-> Text (Meta Bool))
@@ -170,7 +171,7 @@
                         _     false)])
 
          #.None
-         ((//.throw unknown-module module-name) compiler))))]
+         ((//compiler.throw unknown-module module-name) compiler))))]
 
   [set-active   active?   #.Active]
   [set-compiled compiled? #.Compiled]
@@ -186,7 +187,7 @@
          (#e.Success [compiler (get@ <tag> module)])
 
          #.None
-         ((//.throw unknown-module module-name) compiler))))]
+         ((//compiler.throw unknown-module module-name) compiler))))]
 
   [tags  #.tags        (List [Text [Nat (List Ident) Bool Type]])]
   [types #.types       (List [Text [(List Ident) Bool Type]])]
@@ -204,7 +205,7 @@
                       (wrap [])
 
                       (#.Some _)
-                      (//.throw cannot-declare-tag-twice [module-name tag])))
+                      (//compiler.throw cannot-declare-tag-twice [module-name tag])))
                   tags)]
     (wrap [])))
 
@@ -217,10 +218,10 @@
                                (wrap type-ident)
 
                                _
-                               (//.throw cannot-declare-tags-for-unnamed-type [tags type]))
+                               (//compiler.throw cannot-declare-tags-for-unnamed-type [tags type]))
      _ (ensure-undeclared-tags self-name tags)
-     _ (//.assert cannot-declare-tags-for-foreign-type [tags type]
-                  (text/= self-name type-module))]
+     _ (//compiler.assert cannot-declare-tags-for-foreign-type [tags type]
+                          (text/= self-name type-module))]
     (function (_ compiler)
       (case (|> compiler (get@ #.modules) (plist.get self-name))
         (#.Some module)
@@ -236,4 +237,4 @@
                                 compiler)
                        []]))
         #.None
-        ((//.throw unknown-module self-name) compiler)))))
+        ((//compiler.throw unknown-module self-name) compiler)))))
diff --git a/stdlib/test/test/lux/lang/analysis/case.lux b/stdlib/test/test/lux/lang/compiler/analysis/case.lux
index 9e775f8a3..d2836558e 100644
--- a/stdlib/test/test/lux/lang/analysis/case.lux
+++ b/stdlib/test/test/lux/lang/compiler/analysis/case.lux
@@ -14,12 +14,12 @@
        ["r" math/random "r/" Monad<Random>]
        [macro #+ Monad<Meta>]
        (macro [code])
-       [lang]
        (lang [type "type/" Eq<Type>]
              (type ["tc" check])
              [".L" module]
-             (analysis [".A" type]
-                       ["/" case]))
+             (compiler [analysis]
+                       (analysis [".A" type]
+                                 ["/" case])))
        test)
   (// ["_." primitive]
       ["_." structure]))
@@ -145,8 +145,8 @@
                variantTC (list.zip2 variant-tags+ primitivesC)]
          inputC (input variant-tags+ record-tags+ primitivesC)
          [outputT outputC] _primitive.primitive
-         [heterogeneousT heterogeneousC] (|> _primitive.primitive
-                                             (r.filter (|>> product.left (tc.checks? outputT) not)))
+         [heterogeneousT heterogeneousC] (r.filter (|>> product.left (tc.checks? outputT) not)
+                                                   _primitive.primitive)
          exhaustive-patterns (exhaustive-branches true variantTC inputC)
          redundant-patterns (exhaustive-branches false variantTC inputC)
          redundancy-idx (|> r.nat (:: @ map (n/% (list.size redundant-patterns))))
@@ -166,7 +166,7 @@
                                                           (list.drop (inc heterogeneous-idx) exhaustive-branchesC)))
                analyse-pm (|>> (/.case _primitive.analyse inputC)
                                (typeA.with-type outputT)
-                               lang.with-scope
+                               analysis.with-scope
                                (do Monad<Meta>
                                  [_ (moduleL.declare-tags variant-tags false
                                                           (#.Named [module-name variant-name]
@@ -190,5 +190,5 @@
                       _structure.check-fails))
             (test "Will reject pattern-matching if the bodies of the branches do not all have the same type."
                   (|> (analyse-pm heterogeneous-branchesC)
-                      _structure.check-fails))
-            ))))
+                      _structure.check-fails)))
+        )))
diff --git a/stdlib/test/test/lux/lang/analysis/function.lux b/stdlib/test/test/lux/lang/compiler/analysis/function.lux
index a99504045..147cbcc9e 100644
--- a/stdlib/test/test/lux/lang/analysis/function.lux
+++ b/stdlib/test/test/lux/lang/compiler/analysis/function.lux
@@ -14,12 +14,12 @@
        (macro [code])
        [lang]
        (lang [type "type/" Eq<Type>]
-             [".L" init]
              [".L" reference]
-             [".L" analysis #+ Analysis]
-             (analysis [".A" type]
-                       [".A" expression]
-                       ["/" function]))
+             (compiler [".L" init]
+                       [".L" analysis #+ Analysis]
+                       (analysis [".A" type]
+                                 [".A" expression]
+                                 ["/" function])))
        test)
   (// ["_." primitive]
       ["_." structure]))
diff --git a/stdlib/test/test/lux/lang/analysis/primitive.lux b/stdlib/test/test/lux/lang/compiler/analysis/primitive.lux
index 6e2a8aae9..18b8f6c46 100644
--- a/stdlib/test/test/lux/lang/analysis/primitive.lux
+++ b/stdlib/test/test/lux/lang/compiler/analysis/primitive.lux
@@ -11,10 +11,10 @@
        (macro [code])
        [lang]
        (lang [".L" type "type/" Eq<Type>]
-             [".L" init]
-             [analysis #+ Analysis]
-             (analysis [".A" type]
-                       [".A" expression]))
+             (compiler [".L" init]
+                       [analysis #+ Analysis]
+                       (analysis [".A" type]
+                                 [".A" expression])))
        test))
 
 (def: #export analyse (expressionA.analyser (:! lang.Eval [])))
diff --git a/stdlib/test/test/lux/lang/analysis/procedure/common.lux b/stdlib/test/test/lux/lang/compiler/analysis/procedure/common.lux
index 898376045..898376045 100644
--- a/stdlib/test/test/lux/lang/analysis/procedure/common.lux
+++ b/stdlib/test/test/lux/lang/compiler/analysis/procedure/common.lux
diff --git a/stdlib/test/test/lux/lang/analysis/procedure/host.jvm.lux b/stdlib/test/test/lux/lang/compiler/analysis/procedure/host.jvm.lux
index 0a60149d5..0a60149d5 100644
--- a/stdlib/test/test/lux/lang/analysis/procedure/host.jvm.lux
+++ b/stdlib/test/test/lux/lang/compiler/analysis/procedure/host.jvm.lux
diff --git a/stdlib/test/test/lux/lang/analysis/reference.lux b/stdlib/test/test/lux/lang/compiler/analysis/reference.lux
index 6551e3cba..ff7ce3412 100644
--- a/stdlib/test/test/lux/lang/analysis/reference.lux
+++ b/stdlib/test/test/lux/lang/compiler/analysis/reference.lux
@@ -12,11 +12,11 @@
        (lang [type "type/" Eq<Type>]
              [".L" scope]
              [".L" module]
-             [".L" init]
              [".L" reference]
-             [".L" analysis]
-             (analysis [".A" type]
-                       [".A" expression]))
+             (compiler [".L" init]
+                       [".L" analysis]
+                       (analysis [".A" type]
+                                 [".A" expression])))
        test)
   (// ["_." primitive]))
 
diff --git a/stdlib/test/test/lux/lang/analysis/structure.lux b/stdlib/test/test/lux/lang/compiler/analysis/structure.lux
index 20b911714..2f3e369d6 100644
--- a/stdlib/test/test/lux/lang/analysis/structure.lux
+++ b/stdlib/test/test/lux/lang/compiler/analysis/structure.lux
@@ -18,11 +18,11 @@
        (lang [type "type/" Eq<Type>]
              (type ["tc" check])
              [".L" module]
-             [".L" init]
-             [".L" analysis #+ Analysis Variant Tag]
-             (analysis [".A" type]
-                       ["/" structure]
-                       [".A" expression]))
+             (compiler [".L" init]
+                       [".L" analysis #+ Analysis Variant Tag]
+                       (analysis [".A" type]
+                                 ["/" structure]
+                                 [".A" expression])))
        test)
   (// ["_." primitive]))
 
diff --git a/stdlib/test/test/lux/lang/synthesis/case.lux b/stdlib/test/test/lux/lang/compiler/synthesis/case.lux
index 228ed2920..228ed2920 100644
--- a/stdlib/test/test/lux/lang/synthesis/case.lux
+++ b/stdlib/test/test/lux/lang/compiler/synthesis/case.lux
diff --git a/stdlib/test/test/lux/lang/synthesis/function.lux b/stdlib/test/test/lux/lang/compiler/synthesis/function.lux
index c7b16de27..c7b16de27 100644
--- a/stdlib/test/test/lux/lang/synthesis/function.lux
+++ b/stdlib/test/test/lux/lang/compiler/synthesis/function.lux
diff --git a/stdlib/test/test/lux/lang/synthesis/primitive.lux b/stdlib/test/test/lux/lang/compiler/synthesis/primitive.lux
index 1c8368204..1c8368204 100644
--- a/stdlib/test/test/lux/lang/synthesis/primitive.lux
+++ b/stdlib/test/test/lux/lang/compiler/synthesis/primitive.lux
diff --git a/stdlib/test/test/lux/lang/synthesis/structure.lux b/stdlib/test/test/lux/lang/compiler/synthesis/structure.lux
index e61386044..e61386044 100644
--- a/stdlib/test/test/lux/lang/synthesis/structure.lux
+++ b/stdlib/test/test/lux/lang/compiler/synthesis/structure.lux