- Added parallel compilation.

- Added aliasing.
- Several bug fixes.
- Some minor refactoring.

15 files changed, 494 insertions, 178 deletions

diff --git a/new-luxc/source/luxc/io.jvm.lux b/new-luxc/source/luxc/io.jvm.lux
index 79a4ecfc5..21c3da256 100644
--- a/new-luxc/source/luxc/io.jvm.lux
+++ b/new-luxc/source/luxc/io.jvm.lux
@@ -2,7 +2,7 @@
   lux
   (lux (control monad
                 ["ex" exception #+ exception:])
-       [io #- run]
+       [io #+ Process]
        (concurrency ["P" promise]
                     ["T" task])
        (data ["e" error]
@@ -21,24 +21,49 @@
 
 (exception: #export File-Not-Found)
 (exception: #export Module-Not-Found)
+(exception: #export Could-Not-Read-All-Data)
+
+(host;import #long java.io.File
+  (new [String])
+  (exists [] #io #try boolean)
+  (mkdir [] #io #try boolean)
+  (delete [] #io #try boolean)
+  (length [] #io #try long)
+  (listFiles [] #io #try (Array java.io.File))
+  (getAbsolutePath [] #io #try String)
+  (isFile [] #io #try boolean)
+  (isDirectory [] #io #try boolean))
+
+(host;import java.lang.AutoCloseable
+  (close [] #io #try void))
+
+(host;import java.io.InputStream
+  (read [(Array byte)] #io #try int))
+
+(host;import java.io.FileInputStream
+  (new [java.io.File] #io #try))
+
+(def: file-exists?
+  (-> File (Process Bool))
+  (|>. java.io.File.new (java.io.File.exists [])))
 
 (def: (find-source path dirs)
-  (-> Text (List File) (T;Task [Text File]))
+  (-> Text (List File) (Process [Text File]))
   (case dirs
     #;Nil
-    (T;throw File-Not-Found path)
+    (io;fail (File-Not-Found path))
 
     (#;Cons dir dirs')
-    (do T;Monad<Task>
+    (do io;Monad<Process>
       [#let [file (format dir "/" path)]
-       ? (file;exists? file)]
+       ? (file-exists? file)]
       (if ?
         (wrap [path file])
         (find-source path dirs')))))
 
 (def: (either left right)
-  (All [a] (-> (T;Task a) (T;Task a) (T;Task a)))
-  (do P;Monad<Promise>
+  (All [a] (-> (Process a) (Process a) (Process a)))
+  (do io;Monad<IO>
     [?output left]
     (case ?output
       (#e;Success output)
@@ -47,17 +72,30 @@
       (#e;Error error)
       right)))
 
+(def: #export (read-file file)
+  (-> File (Process Blob))
+  (do io;Monad<Process>
+    [#let [file' (java.io.File.new file)]
+     size (java.io.File.length [] file')
+     #let [data (blob;create (int-to-nat size))]
+     stream (FileInputStream.new [file'])
+     bytes-read (InputStream.read [data] stream)
+     _ (AutoCloseable.close [] stream)]
+    (if (i.= size bytes-read)
+      (wrap data)
+      (io;fail (Could-Not-Read-All-Data file)))))
+
 (def: #export (read-module dirs name)
-  (-> (List File) Text (T;Task [File Text]))
+  (-> (List File) Text (Process [File Text]))
   (let [host-path (format name host-extension lux-extension)
         lux-path (format name lux-extension)]
-    (do T;Monad<Task>
-      [[path file] (: (T;Task [Text File])
+    (do io;Monad<Process>
+      [[path file] (: (Process [Text File])
                       ($_ either
                           (find-source host-path dirs)
                           (find-source lux-path dirs)
-                          (T;throw Module-Not-Found name)))
-       blob (file;read file)]
+                          (io;fail (Module-Not-Found name))))
+       blob (read-file file)]
       (wrap [path (String.new blob)]))))
 
 (def: #export (write-module name descriptor)
@@ -69,11 +107,6 @@
   (format root-target "/" (for {"JVM" "jvm"
                                 "JS" "js"})))
 
-(def: (platform-file root-file)
-  (-> File File)
-  (format root-file (for {"JVM" ".class"
-                          "JS" ".js"})))
-
 (def: #export (prepare-target target-dir)
   (-> File (T;Task Unit))
   (do T;Monad<Task>
@@ -89,6 +122,6 @@
 
 (def: #export (write-file target-dir file-name content)
   (-> File Text Blob (T;Task Unit))
-  (file;write content
-              (format (platform-target target-dir)
-                      "/" (platform-file file-name))))
+  (|> file-name
+      (format (platform-target target-dir) "/")
+      (file;write content)))
diff --git a/new-luxc/source/luxc/lang.lux b/new-luxc/source/luxc/lang.lux
index 4aa47754a..b85409fb9 100644
--- a/new-luxc/source/luxc/lang.lux
+++ b/new-luxc/source/luxc/lang.lux
@@ -243,3 +243,15 @@
     (if (n.= underflow idx)
       output
       (recur (n.dec idx) (format (|> (text;nth idx name) maybe;assume normalize-char) output)))))
+
+(exception: #export Error)
+
+(def: #export (with-error-tracking action)
+  (All [a] (-> (Meta a) (Meta a)))
+  (function [compiler]
+    (case (action compiler)
+      (#e;Error error)
+      ((throw Error error) compiler)
+
+      output
+      output)))
diff --git a/new-luxc/source/luxc/lang/analysis/case.lux b/new-luxc/source/luxc/lang/analysis/case.lux
index 5d4c592aa..4a28ce436 100644
--- a/new-luxc/source/luxc/lang/analysis/case.lux
+++ b/new-luxc/source/luxc/lang/analysis/case.lux
@@ -239,7 +239,7 @@
     (^ [cursor (#;Form (list& [_ (#;Tag tag)] values))])
     (&;with-cursor cursor
       (do macro;Monad<Meta>
-        [tag (macro;normalize tag)
+        [tag (macro;canonical tag)
          [idx group variantT] (macro;resolve-tag tag)
          _ (&;with-type-env
              (tc;check inputT variantT))]
diff --git a/new-luxc/source/luxc/lang/analysis/expression.lux b/new-luxc/source/luxc/lang/analysis/expression.lux
index 5d38f7626..89fb3b93e 100644
--- a/new-luxc/source/luxc/lang/analysis/expression.lux
+++ b/new-luxc/source/luxc/lang/analysis/expression.lux
@@ -29,14 +29,14 @@
 (def: #export (analyser eval)
   (-> &;Eval &;Analyser)
   (: (-> Code (Meta la;Analysis))
-     (function analyse [ast]
+     (function analyse [code]
        (do macro;Monad<Meta>
          [expectedT macro;expected-type]
-         (let [[cursor ast'] ast]
+         (let [[cursor code'] code]
            ## The cursor must be set in the compiler for the sake
            ## of having useful error messages.
            (&;with-cursor cursor
-             (case ast'
+             (case code'
                (^template [<tag> <analyser>]
                  (<tag> value)
                  (<analyser> value))
@@ -83,16 +83,18 @@
                
                (^ (#;Form (list& func args)))
                (do macro;Monad<Meta>
-                 [[funcT =func] (commonA;with-unknown-type
+                 [[funcT funcA] (commonA;with-unknown-type
                                   (analyse func))]
-                 (case =func
+                 (case funcA
                    [_ (#;Symbol def-name)]
                    (do @
-                     [[def-type def-anns def-value] (macro;find-def def-name)]
-                     (if (macro;macro? def-anns)
+                     [?macro (&;with-error-tracking
+                               (macro;find-macro def-name))]
+                     (case ?macro
+                       (#;Some macro)
                        (do @
                          [expansion (function [compiler]
-                                      (case (macroL;expand (:! Macro def-value) args compiler)
+                                      (case (macroL;expand macro args compiler)
                                         (#e;Success [compiler' output])
                                         (#e;Success [compiler' output])
 
@@ -103,12 +105,14 @@
                            (analyse single)
 
                            _
-                           (&;throw Macro-Expression-Must-Have-Single-Expansion (%code ast))))
-                       (functionA;analyse-apply analyse funcT =func args)))
+                           (&;throw Macro-Expression-Must-Have-Single-Expansion (%code code))))
+
+                       _
+                       (functionA;analyse-apply analyse funcT funcA args)))
 
                    _
-                   (functionA;analyse-apply analyse funcT =func args)))
+                   (functionA;analyse-apply analyse funcT funcA args)))
 
                _
-               (&;throw Unrecognized-Syntax (%code ast))
+               (&;throw Unrecognized-Syntax (%code code))
                )))))))
diff --git a/new-luxc/source/luxc/lang/analysis/reference.lux b/new-luxc/source/luxc/lang/analysis/reference.lux
index 25b33881c..7475f269f 100644
--- a/new-luxc/source/luxc/lang/analysis/reference.lux
+++ b/new-luxc/source/luxc/lang/analysis/reference.lux
@@ -13,9 +13,16 @@
 (def: (analyse-definition def-name)
   (-> Ident (Meta Analysis))
   (do macro;Monad<Meta>
-    [actualT (macro;find-def-type def-name)
-     _ (&;infer actualT)]
-    (wrap (code;symbol def-name))))
+    [[actualT def-anns _] (&;with-error-tracking
+                            (macro;find-def def-name))]
+    (case (macro;get-symbol-ann (ident-for #;alias) def-anns)
+      (#;Some real-def-name)
+      (analyse-definition real-def-name)
+
+      _
+      (do @
+        [_ (&;infer actualT)]
+        (wrap (code;symbol def-name))))))
 
 (def: (analyse-variable var-name)
   (-> Text (Meta (Maybe Analysis)))
diff --git a/new-luxc/source/luxc/lang/analysis/structure.lux b/new-luxc/source/luxc/lang/analysis/structure.lux
index 2292d93cf..19eebbc46 100644
--- a/new-luxc/source/luxc/lang/analysis/structure.lux
+++ b/new-luxc/source/luxc/lang/analysis/structure.lux
@@ -235,7 +235,7 @@
 (def: #export (analyse-tagged-sum analyse tag valueC)
   (-> &;Analyser Ident Code (Meta la;Analysis))
   (do macro;Monad<Meta>
-    [tag (macro;normalize tag)
+    [tag (macro;canonical tag)
      [idx group variantT] (macro;resolve-tag tag)
      expectedT macro;expected-type]
     (case expectedT
@@ -261,7 +261,7 @@
                (case key
                  [_ (#;Tag key)]
                  (do macro;Monad<Meta>
-                   [key (macro;normalize key)]
+                   [key (macro;canonical key)]
                    (wrap [key val]))
 
                  _
@@ -281,7 +281,7 @@
 
     (#;Cons [head-k head-v] _)
     (do macro;Monad<Meta>
-      [head-k (macro;normalize head-k)
+      [head-k (macro;canonical head-k)
        [_ tag-set recordT] (macro;resolve-tag head-k)
        #let [size-record (list;size record)
              size-ts (list;size tag-set)]
@@ -296,7 +296,7 @@
        idx->val (monad;fold @
                             (function [[key val] idx->val]
                               (do @
-                                [key (macro;normalize key)]
+                                [key (macro;canonical key)]
                                 (case (dict;get key tag->idx)
                                   #;None
                                   (&;throw Tag-Does-Not-Belong-To-Record
@@ -323,14 +323,20 @@
   (-> &;Analyser (List [Code Code]) (Meta la;Analysis))
   (do macro;Monad<Meta>
     [members (normalize members)
-     [membersC recordT] (order members)
-     expectedT macro;expected-type]
-    (case expectedT
-      (#;Var _)
-      (do @
-        [inferenceT (&inference;record recordT)
-         [inferredT membersA] (&inference;general analyse inferenceT membersC)]
-        (wrap (la;product membersA)))
+     [membersC recordT] (order members)]
+    (case membersC
+      (^ (list singletonC))
+      (analyse singletonC)
 
       _
-      (analyse-product analyse membersC))))
+      (do @
+        [expectedT macro;expected-type]
+        (case expectedT
+          (#;Var _)
+          (do @
+            [inferenceT (&inference;record recordT)
+             [inferredT membersA] (&inference;general analyse inferenceT membersC)]
+            (wrap (la;product membersA)))
+
+          _
+          (analyse-product analyse membersC))))))
diff --git a/new-luxc/source/luxc/lang/host.jvm.lux b/new-luxc/source/luxc/lang/host.jvm.lux
index 726bb5bbc..9f8fcd069 100644
--- a/new-luxc/source/luxc/lang/host.jvm.lux
+++ b/new-luxc/source/luxc/lang/host.jvm.lux
@@ -3,7 +3,7 @@
   (lux (control [monad #+ do]
                 ["ex" exception #+ exception:]
                 pipe)
-       (concurrency ["A" atom])
+       (concurrency [atom #+ Atom atom])
        (data ["e" error]
              [text]
              text/format
@@ -62,11 +62,11 @@
 
 (def: (fetch-byte-code class-name store)
   (-> Text commonT;Class-Store (Maybe commonT;Bytecode))
-  (|> store A;get io;run (dict;get class-name)))
+  (|> store atom;read io;run (dict;get class-name)))
 
 (def: (memory-class-loader store)
   (-> commonT;Class-Store ClassLoader)
-  (object ClassLoader []
+  (object [] ClassLoader []
     []
     (ClassLoader (findClass [class-name String]) Class
                  (case (fetch-byte-code class-name store)
@@ -85,7 +85,7 @@
 (def: #export init-host
   (io;IO commonT;Host)
   (io;io (let [store (: commonT;Class-Store
-                        (A;atom (dict;new text;Hash<Text>)))]
+                        (atom (dict;new text;Hash<Text>)))]
            {#commonT;loader (memory-class-loader store)
             #commonT;store store
             #commonT;artifacts (dict;new text;Hash<Text>)
diff --git a/new-luxc/source/luxc/lang/module.lux b/new-luxc/source/luxc/lang/module.lux
index 2b855d927..f6cffa9c6 100644
--- a/new-luxc/source/luxc/lang/module.lux
+++ b/new-luxc/source/luxc/lang/module.lux
@@ -1,7 +1,8 @@
 (;module:
   lux
   (lux (control [monad #+ do]
-                ["ex" exception #+ exception:])
+                ["ex" exception #+ exception:]
+                pipe)
        (data [text "text/" Eq<Text>]
              text/format
              ["e" error]
@@ -15,6 +16,9 @@
 (exception: #export Cannot-Declare-Tag-Twice)
 (exception: #export Cannot-Declare-Tags-For-Unnamed-Type)
 (exception: #export Cannot-Declare-Tags-For-Foreign-Type)
+(exception: #export Cannot-Define-More-Than-Once)
+(exception: #export Cannot-Define-In-Unknown-Module)
+(exception: #export Can-Only-Change-State-Of-Active-Module)
 
 (def: (new-module hash)
   (-> Nat Module)
@@ -27,6 +31,45 @@
    #;module-annotations (' {})
    #;module-state       #;Active})
 
+(def: #export (set-annotations annotations)
+  (-> Code (Meta Unit))
+  (do macro;Monad<Meta>
+    [self macro;current-module-name]
+    (function [compiler]
+      (#e;Success [(update@ #;modules
+                            (&;pl-update self (set@ #;module-annotations annotations))
+                            compiler)
+                   []]))))
+
+(def: #export (import module)
+  (-> Text (Meta Unit))
+  (do macro;Monad<Meta>
+    [self macro;current-module-name]
+    (function [compiler]
+      (#e;Success [(update@ #;modules
+                            (&;pl-update self (update@ #;imports (|>. (#;Cons module))))
+                            compiler)
+                   []]))))
+
+(def: #export (alias alias module)
+  (-> Text Text (Meta Unit))
+  (do macro;Monad<Meta>
+    [self macro;current-module-name]
+    (function [compiler]
+      (#e;Success [(update@ #;modules
+                            (&;pl-update self (update@ #;module-aliases (: (-> (List [Text Text]) (List [Text Text]))
+                                                                           (|>. (#;Cons [alias module])))))
+                            compiler)
+                   []]))))
+
+(def: #export (exists? module)
+  (-> Text (Meta Bool))
+  (function [compiler]
+    (|> (get@ #;modules compiler)
+        (&;pl-get module)
+        (case> (#;Some _) true #;None false)
+        [compiler] #e;Success)))
+
 (def: #export (define (^@ full-name [module-name def-name])
                       definition)
   (-> Ident Def (Meta Unit))
@@ -45,10 +88,10 @@
                      []])
 
         (#;Some already-existing)
-        (#e;Error (format "Cannot re-define definiton: " (%ident full-name))))
+        ((&;throw Cannot-Define-More-Than-Once (%ident full-name)) compiler))
 
       #;None
-      (#e;Error (format "Cannot define in unknown module: " module-name)))))
+      ((&;throw Cannot-Define-In-Unknown-Module (%ident full-name)) compiler))))
 
 (def: #export (create hash name)
   (-> Nat Text (Meta Module))
@@ -64,11 +107,11 @@
   (do macro;Monad<Meta>
     [_ (create hash name)
      output (&;with-current-module name
-              (&scope;with-scope name action))
+              action)
      module (macro;find-module name)]
     (wrap [module output])))
 
-(do-template [<flagger> <asker> <tag>]
+(do-template [<flagger> <asker> <tag> <description>]
   [(def: #export (<flagger> module-name)
      (-> Text (Meta Unit))
      (function [compiler]
@@ -82,10 +125,13 @@
                                    (&;pl-put module-name (set@ #;module-state <tag> module))
                                    compiler)
                           []])
-             (#e;Error "Can only change the state of a currently-active module.")))
+             ((&;throw Can-Only-Change-State-Of-Active-Module
+                       (format "       Module: " module-name "\n"
+                               "Desired state: " <description>))
+              compiler)))
 
          #;None
-         (#e;Error (format "Module does not exist: " module-name)))))
+         ((&;throw Unknown-Module module-name) compiler))))
    (def: #export (<asker> module-name)
      (-> Text (Meta Bool))
      (function [compiler]
@@ -97,12 +143,12 @@
                         _     false)])
 
          #;None
-         (#e;Error (format "Module does not exist: " module-name)))
+         ((&;throw Unknown-Module module-name) compiler))
        ))]
 
-  [flag-active!   active?   #;Active]
-  [flag-compiled! compiled? #;Compiled]
-  [flag-cached!   cached?   #;Cached]
+  [flag-active!   active?   #;Active   "Active"]
+  [flag-compiled! compiled? #;Compiled "Compiled"]
+  [flag-cached!   cached?   #;Cached   "Cached"]
   )
 
 (do-template [<name> <tag> <type>]
@@ -114,7 +160,7 @@
          (#e;Success [compiler (get@ <tag> module)])
 
          #;None
-         (macro;run compiler (&;throw Unknown-Module module-name)))
+         ((&;throw Unknown-Module module-name) compiler))
        ))]
 
   [tags-by-module  #;tags        (List [Text [Nat (List Ident) Bool Type]])]
@@ -170,4 +216,4 @@
                                 compiler)
                        []]))
         #;None
-        (macro;run compiler (&;throw Unknown-Module current-module))))))
+        ((&;throw Unknown-Module current-module) compiler)))))
diff --git a/new-luxc/source/luxc/lang/translation.lux b/new-luxc/source/luxc/lang/translation.lux
index dd84ad024..33f74795a 100644
--- a/new-luxc/source/luxc/lang/translation.lux
+++ b/new-luxc/source/luxc/lang/translation.lux
@@ -2,16 +2,18 @@
   lux
   (lux (control [monad #+ do]
                 ["ex" exception #+ exception:])
-       (concurrency ["T" task])
+       (concurrency ["P" promise]
+                    ["T" task])
        (data ["e" error]
              [text "text/" Hash<Text>]
              text/format
-             (coll [dict]))
+             (coll [list]
+                   [dict]))
        [macro]
        (lang [syntax]
              (type ["tc" check]))
        [host]
-       [io]
+       [io #+ IO Process io]
        (world [file #+ File]))
   (luxc ["&" lang]
         ["&;" io]
@@ -26,7 +28,8 @@
                            [";T" statement]
                            [";T" common]
                            [";T" expression]
-                           [";T" eval])
+                           [";T" eval]
+                           [";T" imports])
               ["&;" eval])
         ))
 
@@ -36,6 +39,7 @@
 
 (exception: #export Macro-Expansion-Failed)
 (exception: #export Unrecognized-Statement)
+(exception: #export Invalid-Alias)
 
 (def: (process-annotations annsC)
   (-> Code (Meta [$;Inst Code]))
@@ -47,58 +51,92 @@
      annsV (evalT;eval annsI)]
     (wrap [annsI (:! Code annsV)])))
 
-(def: (translate code)
-  (-> Code (Meta Unit))
-  (case code
-    (^code ("lux def" (~ [_ (#;Symbol ["" def-name])]) (~ valueC) (~ annsC)))
-    (hostL;with-context def-name
-      (&;with-fresh-type-env
-        (do macro;Monad<Meta>
-          [[annsI annsV] (process-annotations annsC)
-           [_ valueT valueA] (&;with-scope
-                               (if (macro;type? (:! Code annsV))
-                                 (do @
-                                   [valueA (&;with-type Type
-                                             (analyse valueC))]
-                                   (wrap [Type valueA]))
-                                 (commonA;with-unknown-type
-                                   (analyse valueC))))
-           valueT (&;with-type-env
-                    (tc;clean valueT))
-           valueI (expressionT;translate (expressionS;synthesize valueA))
-           _ (&;with-scope
-               (statementT;translate-def def-name valueT valueI annsI annsV))]
-          (wrap []))))
+(def: (switch-compiler new-compiler)
+  (-> Compiler (Meta Unit))
+  (function [old-compiler]
+    (#e;Success [new-compiler []])))
 
-    (^code ("lux program" (~ [_ (#;Symbol ["" program-args])]) (~ programC)))
-    (do macro;Monad<Meta>
-      [[_ programA] (&;with-scope
-                      (&;with-type (type (io;IO Unit))
-                        (analyse programC)))
-       programI (expressionT;translate (expressionS;synthesize programA))]
-      (statementT;translate-program program-args programI))
+(def: (ensure-valid-alias def-name annotations value)
+  (-> Text Code Code (Meta Unit))
+  (case [annotations value]
+    (^multi [[_ (#;Record pairs)] [_ (#;Symbol _)]]
+            (|> pairs list;size (n.= +1)))
+    (:: macro;Monad<Meta> wrap [])
 
-    (^code ("lux module" (~ annsC)))
-    (do macro;Monad<Meta>
-      [[annsI annsV] (process-annotations annsC)]
-      (&;fail (%code annsV)))
+    _
+    (&;throw Invalid-Alias def-name)))
 
+(def: (translate translate-module code)
+  (-> (-> Text Compiler (Process Compiler)) Code (Meta Unit))
+  (case code
     (^code ((~ [_ (#;Symbol macro-name)]) (~@ args)))
     (do macro;Monad<Meta>
-      [macro-name (macro;normalize macro-name)
-       [def-type def-anns def-value] (macro;find-def macro-name)]
-      (if (macro;macro? def-anns)
+      [?macro (&;with-error-tracking
+                (macro;find-macro macro-name))]
+      (case ?macro
+        (#;Some macro)
         (do @
           [expansion (function [compiler]
-                       (case (macroL;expand (:! Macro def-value) args compiler)
+                       (case (macroL;expand macro args compiler)
                          (#e;Success [compiler' output])
                          (#e;Success [compiler' output])
 
                          (#e;Error error)
                          ((&;throw Macro-Expansion-Failed error) compiler)))
-           _ (monad;map @ translate expansion)]
+           _ (monad;map @ (translate translate-module) expansion)]
           (wrap []))
+
+        #;None
         (&;throw Unrecognized-Statement (%code code))))
+    
+    (^code ("lux def" (~ [_ (#;Symbol ["" def-name])]) (~ valueC) (~ annsC)))
+    (hostL;with-context def-name
+      (&;with-fresh-type-env
+        (do macro;Monad<Meta>
+          [[annsI annsV] (process-annotations annsC)]
+          (case (macro;get-symbol-ann (ident-for #;alias) annsV)
+            (#;Some real-def)
+            (do @
+              [_ (ensure-valid-alias def-name annsV valueC)
+               _ (&;with-scope
+                   (statementT;translate-def def-name Void id annsI annsV))]
+              (wrap []))
+
+            #;None
+            (do @
+              [[_ valueT valueA] (&;with-scope
+                                   (if (macro;type? (:! Code annsV))
+                                     (do @
+                                       [valueA (&;with-type Type
+                                                 (analyse valueC))]
+                                       (wrap [Type valueA]))
+                                     (commonA;with-unknown-type
+                                       (analyse valueC))))
+               valueT (&;with-type-env
+                        (tc;clean valueT))
+               valueI (expressionT;translate (expressionS;synthesize valueA))
+               _ (&;with-scope
+                   (statementT;translate-def def-name valueT valueI annsI annsV))]
+              (wrap []))))))
+
+    (^code ("lux module" (~ annsC)))
+    (do macro;Monad<Meta>
+      [[annsI annsV] (process-annotations annsC)
+       process (importsT;translate-imports translate-module annsV)]
+      (case (io;run process)
+        (#e;Success compiler')
+        (switch-compiler compiler')
+        
+        (#e;Error error)
+        (macro;fail error)))
+
+    (^code ("lux program" (~ [_ (#;Symbol ["" program-args])]) (~ programC)))
+    (do macro;Monad<Meta>
+      [[_ programA] (&;with-scope
+                      (&;with-type (type (io;IO Unit))
+                        (analyse programC)))
+       programI (expressionT;translate (expressionS;synthesize programA))]
+      (statementT;translate-program program-args programI))
 
     _
     (&;throw Unrecognized-Statement (%code code))))
@@ -126,10 +164,10 @@
      _ (moduleL;flag-compiled! module-name)]
     (wrap output)))
 
-(def: (parse current-module)
+(def: (read current-module)
   (-> Text (Meta Code))
   (function [compiler]
-    (case (syntax;parse current-module (get@ #;source compiler))
+    (case (syntax;read current-module (get@ #;source compiler))
       (#e;Error error)
       (#e;Error error)
 
@@ -138,11 +176,13 @@
                    output]))))
 
 (def: (translate-module source-dirs target-dir module-name compiler)
-  (-> (List File) File Text Compiler (T;Task Compiler))
-  (do T;Monad<Task>
-    [_ (&io;prepare-module target-dir module-name)
+  (-> (List File) File Text Compiler (Process Compiler))
+  (do io;Monad<Process>
+    [#let [_ (log! (format "{translate-module} " module-name))]
+     ## _ (&io;prepare-module target-dir module-name)
      [file-name file-content] (&io;read-module source-dirs module-name)
-     #let [module-hash (text/hash file-content)]]
+     #let [module-hash (text/hash file-content)
+           translate-module (translate-module source-dirs target-dir)]]
     (case (macro;run' compiler
                       (do macro;Monad<Meta>
                         [[_ artifacts _] (moduleL;with-module module-hash module-name
@@ -152,20 +192,21 @@
                                                                        file-content]
                                                (exhaust
                                                 (do @
-                                                  [code (parse module-name)
+                                                  [code (read module-name)
                                                    #let [[cursor _] code]]
                                                   (&;with-cursor cursor
-                                                    (translate code)))))))]
+                                                    (translate translate-module code)))))))]
                         (wrap artifacts)))
       (#e;Success [compiler artifacts])
       (do @
-        [_ (monad;map @ (function [[class-name class-bytecode]]
-                          (&io;write-file target-dir class-name class-bytecode))
-                      (dict;entries artifacts))]
+        [## _ (monad;map @ (function [[class-name class-bytecode]]
+         ##                  (&io;write-file target-dir class-name class-bytecode))
+         ##              (dict;entries artifacts))
+         ]
         (wrap compiler))
       
       (#e;Error error)
-      (T;fail error))))
+      (io;fail error))))
 
 (def: init-cursor Cursor ["" +1 +0])
 
@@ -177,7 +218,8 @@
 
 (def: #export init-info
   Info
-  {#;target  "JVM"
+  {#;target  (for {"JVM" "JVM"
+                   "JS" "JS"})
    #;version &;version
    #;mode    #;Build})
 
@@ -205,11 +247,11 @@
                     (#e;Success [compiler [runtime-bc function-bc]])
                     (do @
                       [_ (&io;prepare-target target)
-                       _ (&io;write-file target hostL;runtime-class runtime-bc)
-                       _ (&io;write-file target hostL;function-class function-bc)]
+                       _ (&io;write-file target (format hostL;runtime-class ".class") runtime-bc)
+                       _ (&io;write-file target (format hostL;function-class ".class") function-bc)]
                       (wrap compiler)))
                   (: (T;Task Compiler))
-                  (:: @ map (translate-module sources target prelude)) (:: @ join)
-                  (:: @ map (translate-module sources target program)) (:: @ join))
+                  (:: @ map (|>. (translate-module sources target prelude) P;future)) (:: @ join)
+                  (:: @ map (|>. (translate-module sources target program) P;future)) (:: @ join))
      #let [_ (log! "Compilation complete!")]]
     (wrap [])))
diff --git a/new-luxc/source/luxc/lang/translation/common.jvm.lux b/new-luxc/source/luxc/lang/translation/common.jvm.lux
index 49e135709..7a16a749a 100644
--- a/new-luxc/source/luxc/lang/translation/common.jvm.lux
+++ b/new-luxc/source/luxc/lang/translation/common.jvm.lux
@@ -2,7 +2,7 @@
   [lux #- function]
   (lux (control ["ex" exception #+ exception:])
        [io]
-       (concurrency ["A" atom])
+       (concurrency [atom #+ Atom atom])
        (data ["e" error]
              [text]
              text/format
@@ -30,7 +30,7 @@
 
 (type: #export Bytecode Blob)
 
-(type: #export Class-Store (A;Atom (Dict Text Bytecode)))
+(type: #export Class-Store (Atom (Dict Text Bytecode)))
 
 (type: #export Artifacts (Dict File Blob))
 
@@ -84,16 +84,16 @@
     (let [store (|> (get@ #;host compiler)
                     (:! Host)
                     (get@ #store))]
-      (if (dict;contains? name (|> store A;get io;run))
+      (if (dict;contains? name (|> store atom;read io;run))
         (ex;throw Class-Already-Stored name)
-        (#e;Success [compiler (io;run (A;update (dict;put name byte-code) store))])
+        (#e;Success [compiler (io;run (atom;update (dict;put name byte-code) store))])
         ))))
 
 (def: #export (load-class name)
   (-> Text (Meta (Class Object)))
   (;function [compiler]
     (let [host (:! Host (get@ #;host compiler))
-          store (|> host (get@ #store) A;get io;run)]
+          store (|> host (get@ #store) atom;read io;run)]
       (if (dict;contains? name store)
         (#e;Success [compiler (ClassLoader.loadClass [name] (get@ #loader host))])
         (ex;throw Unknown-Class name)))))
diff --git a/new-luxc/source/luxc/lang/translation/eval.jvm.lux b/new-luxc/source/luxc/lang/translation/eval.jvm.lux
index 11baa3856..6b9ee9743 100644
--- a/new-luxc/source/luxc/lang/translation/eval.jvm.lux
+++ b/new-luxc/source/luxc/lang/translation/eval.jvm.lux
@@ -1,7 +1,8 @@
 (;module:
   lux
   (lux (control monad)
-       (data text/format)
+       (data [text]
+             text/format)
        [macro]
        [host #+ do-to])
   (luxc ["&" lang]
@@ -56,8 +57,10 @@
 (def: #export (eval valueI)
   (-> $;Inst (Meta Top))
   (do macro;Monad<Meta>
-    [class-name (:: @ map %code (macro;gensym "eval"))
-     #let [writer (|> (do-to (ClassWriter.new ClassWriter.COMPUTE_MAXS)
+    [current-module macro;current-module-name
+     class-name (:: @ map %code (macro;gensym (format current-module "/eval")))
+     #let [store-name (text;replace-all "/" "." class-name)
+           writer (|> (do-to (ClassWriter.new ClassWriter.COMPUTE_MAXS)
                         (ClassWriter.visit [commonT;bytecode-version
                                             (i.+ Opcodes.ACC_PUBLIC Opcodes.ACC_SUPER)
                                             class-name
@@ -70,11 +73,11 @@
                                  "<clinit>"
                                  ($t;method (list) #;None (list))
                                  (|>. valueI
-                                      ($i;PUTSTATIC class-name commonT;value-field commonT;$Object)
+                                      ($i;PUTSTATIC store-name commonT;value-field commonT;$Object)
                                       $i;RETURN)))
            bytecode (ClassWriter.toByteArray [] (do-to writer (ClassWriter.visitEnd [])))]
-     _ (commonT;store-class class-name bytecode)
-     class (commonT;load-class class-name)]
+     _ (commonT;store-class store-name bytecode)
+     class (commonT;load-class store-name)]
     (wrap (|> class
               (Class.getField [commonT;value-field])
               (Field.get (host;null))))))
diff --git a/new-luxc/source/luxc/lang/translation/function.jvm.lux b/new-luxc/source/luxc/lang/translation/function.jvm.lux
index d8a2077bc..ab3382952 100644
--- a/new-luxc/source/luxc/lang/translation/function.jvm.lux
+++ b/new-luxc/source/luxc/lang/translation/function.jvm.lux
@@ -291,6 +291,8 @@
      [function-class bodyI] (hostL;with-sub-context
                               (hostL;with-anchor [@begin +1]
                                 (translate bodyS)))
+     this-module macro;current-module-name
+     #let [function-class (format (text;replace-all "/" "." this-module) "." function-class)]
      [functionD instanceI] (with-function @begin function-class env arity bodyI)
      _ (commonT;store-class function-class
                             ($d;class #$;V1.6 #$;Public $;finalC
diff --git a/new-luxc/source/luxc/lang/translation/imports.jvm.lux b/new-luxc/source/luxc/lang/translation/imports.jvm.lux
new file mode 100644
index 000000000..c30f61225
--- /dev/null
+++ b/new-luxc/source/luxc/lang/translation/imports.jvm.lux
@@ -0,0 +1,150 @@
+(;module:
+  lux
+  (lux (control [monad #+ do]
+                ["p" parser]
+                ["ex" exception #+ exception:]
+                pipe)
+       (concurrency [promise #+ Promise]
+                    [stm #+ Var STM])
+       (data ["e" error #+ Error]
+             [maybe]
+             [product]
+             [text "text/" Eq<Text>]
+             text/format
+             (coll [list "list/" Functor<List> Fold<List>]
+                   [dict #+ Dict]))
+       [macro]
+       (macro [code]
+              ["s" syntax])
+       [io #+ IO Process io]
+       [host])
+  (luxc ["&" lang]
+        (lang [";L" module])))
+
+(exception: #export Invalid-Imports)
+(exception: #export Module-Cannot-Import-Itself)
+(exception: #export Circular-Dependency)
+
+(host;import (java.util.concurrent.Future a)
+  (get [] #io a))
+
+(host;import (java.util.concurrent.CompletableFuture a)
+  (new [])
+  (complete [a] boolean)
+  (#static [a] completedFuture [a] (CompletableFuture a)))
+
+(type: Import
+  {#module Text
+   #alias Text})
+
+(def: import (s;Syntax Import) (s;tuple (p;seq s;text s;text)))
+
+(def: compilations
+  (Var (Dict Text (CompletableFuture (Error Compiler))))
+  (stm;var (dict;new text;Hash<Text>)))
+
+(def: (promise-to-future promise)
+  (All [a] (-> (Promise a) (Future a)))
+  (let [future (CompletableFuture.new [])]
+    (exec (:: promise;Functor<Promise> map
+              (function [value] (CompletableFuture.complete [value] future))
+              promise)
+      future)))
+
+(def: from-io
+  (All [a] (-> (IO a) (Process a)))
+  (:: io;Monad<IO> map (|>. #e;Success)))
+
+(def: (translate-dependency translate-module dependency compiler)
+  (-> (-> Text Compiler (Process Compiler))
+      (-> Text Compiler (IO (Future (Error Compiler)))))
+  (<| (Future.get [])
+      promise-to-future
+      (do promise;Monad<Promise>
+        [[new? future] (stm;commit (: (STM [Bool (CompletableFuture (Error Compiler))])
+                                      (do stm;Monad<STM>
+                                        [current-compilations (stm;read compilations)]
+                                        (case (dict;get dependency current-compilations)
+                                          (#;Some ongoing)
+                                          (wrap [false ongoing])
+                                          
+                                          #;None
+                                          (do @
+                                            [#let [pending (: (CompletableFuture (Error Compiler))
+                                                              (CompletableFuture.new []))]
+                                             _ (stm;write (dict;put dependency pending current-compilations)
+                                                          compilations)]
+                                            (wrap [true pending]))))))]
+        (if new?
+          (exec (promise;future (io (CompletableFuture.complete [(io;run (translate-module dependency compiler))]
+                                                                future)))
+            (wrap future))
+          (wrap future)))))
+
+(def: compiled?
+  (-> Module Bool)
+  (|>. (get@ #;module-state)
+       (case>
+        (^or #;Cached #;Compiled)
+        true
+
+        _
+        false)))
+
+(def: (merge-modules current-module from-dependency from-current)
+  (-> Text (List [Text Module]) (List [Text Module]) (List [Text Module]))
+  (|> from-dependency
+      (list;filter (|>. product;right compiled?))
+      (list/fold (function [[dep-name dep-module] total] (&;pl-put dep-name dep-module total))
+                 from-current)))
+
+(def: (merge-compilers current-module dependency total)
+  (-> Text Compiler Compiler Compiler)
+  (|> total
+      (update@ #;modules (merge-modules current-module (get@ #;modules dependency)))
+      (set@ #;seed (get@ #;seed dependency))))
+
+(def: #export (translate-imports translate-module annotations)
+  (-> (-> Text Compiler (Process Compiler))
+      Code
+      (Meta (Process Compiler)))
+  (do macro;Monad<Meta>
+    [_ (moduleL;set-annotations annotations)
+     current-module macro;current-module-name
+     #let [_ (log! (format "{translate-imports} " current-module))]
+     imports (let [imports (|> (macro;get-tuple-ann (ident-for #;imports) annotations)
+                               (maybe;default (list)))]
+               (case (s;run imports (p;some import))
+                 (#e;Success imports)
+                 (wrap imports)
+                 
+                 (#e;Error error)
+                 (&;throw Invalid-Imports (%code (code;tuple imports)))))
+     dependencies (monad;map @ (: (-> [Text Text] (Meta (IO (Future (Error Compiler)))))
+                                  (function [[dependency alias]]
+                                    (do @
+                                      [_ (&;assert Module-Cannot-Import-Itself current-module
+                                                   (not (text/= current-module dependency)))
+                                       already-seen? (moduleL;exists? dependency)
+                                       circular-dependency? (if already-seen?
+                                                              (moduleL;active? dependency)
+                                                              (wrap false))
+                                       _ (&;assert Circular-Dependency (format "From: " current-module "\n"
+                                                                               "  To: " dependency)
+                                                   (not circular-dependency?))
+                                       _ (moduleL;import dependency)
+                                       _ (if (text/= "" alias)
+                                           (wrap [])
+                                           (moduleL;alias alias dependency))
+                                       compiler macro;get-compiler]
+                                      (if already-seen?
+                                        (wrap (io (CompletableFuture.completedFuture [(#e;Success compiler)])))
+                                        (wrap (translate-dependency translate-module dependency compiler))))))
+                             imports)
+     compiler macro;get-compiler]
+    (wrap (do io;Monad<Process>
+            [dependencies (monad;seq io;Monad<Process> (list/map from-io dependencies))
+             dependencies (|> dependencies
+                              (list/map (Future.get []))
+                              (monad;seq io;Monad<Process>))]
+            (wrap (list/fold (merge-compilers current-module) compiler dependencies))))))
diff --git a/new-luxc/source/luxc/lang/translation/reference.jvm.lux b/new-luxc/source/luxc/lang/translation/reference.jvm.lux
index 9d0cc91e4..bfc838041 100644
--- a/new-luxc/source/luxc/lang/translation/reference.jvm.lux
+++ b/new-luxc/source/luxc/lang/translation/reference.jvm.lux
@@ -25,7 +25,9 @@
 (def: #export (translate-captured variable)
   (-> Variable (Meta $;Inst))
   (do macro;Monad<Meta>
-    [function-class hostL;context]
+    [this-module macro;current-module-name
+     function-class hostL;context
+     #let [function-class (format (text;replace-all "/" "." this-module) "." function-class)]]
     (wrap (|>. ($i;ALOAD +0)
                ($i;GETFIELD function-class
                             (|> variable i.inc (i.* -1) int-to-nat captured)
diff --git a/new-luxc/source/luxc/lang/translation/statement.jvm.lux b/new-luxc/source/luxc/lang/translation/statement.jvm.lux
index 387181f98..df7e26741 100644
--- a/new-luxc/source/luxc/lang/translation/statement.jvm.lux
+++ b/new-luxc/source/luxc/lang/translation/statement.jvm.lux
@@ -36,48 +36,57 @@
   (-> Text Type $;Inst $;Inst Code (Meta Unit))
   (do macro;Monad<Meta>
     [current-module macro;current-module-name
-     #let [def-ident [current-module def-name]
-           normal-name (format (&;normalize-name def-name) (%n (text/hash def-name)))
-           bytecode-name (format current-module "/" normal-name)
-           class-name (format current-module "." normal-name)
-           bytecode ($d;class #$;V1.6
-                              #$;Public $;finalC
-                              bytecode-name
-                              (list) ["java.lang.Object" (list)]
-                              (list)
-                              (|>. ($d;field #$;Public ($;++F $;finalF $;staticF) commonT;value-field commonT;$Object)
-                                   ($d;method #$;Public $;staticM "<clinit>" ($t;method (list) #;None (list))
-                                              (|>. valueI
-                                                   ($i;PUTSTATIC bytecode-name commonT;value-field commonT;$Object)
-                                                   $i;RETURN))))]
-     _ (commonT;store-class class-name bytecode)
-     class (commonT;load-class class-name)
-     valueV (: (Meta Top)
-               (case (do e;Monad<Error>
-                       [field (Class.getField [commonT;value-field] class)]
-                       (Field.get [#;None] field))
-                 (#e;Success #;None)
-                 (&;throw Invalid-Definition-Value (%ident def-ident))
-                 
-                 (#e;Success (#;Some valueV))
-                 (wrap valueV)
-                 
-                 (#e;Error error)
-                 (&;throw Cannot-Evaluate-Definition
-                          (format "Definition: " (%ident def-ident) "\n"
-                                  "Error:\n"
-                                  error))))
-     _ (&module;define def-ident [valueT metaV valueV])
-     _ (if (macro;type? metaV)
-         (case (macro;declared-tags metaV)
-           #;Nil
-           (wrap [])
+     #let [def-ident [current-module def-name]]]
+    (case (macro;get-symbol-ann (ident-for #;alias) metaV)
+      (#;Some real-def)
+      (do @
+        [[realT realA realV] (macro;find-def real-def)
+         _ (&module;define def-ident [realT metaV realV])]
+        (wrap []))
 
-           tags
-           (&module;declare-tags tags (macro;export? metaV) (:! Type valueV)))
-         (wrap []))
-     #let [_ (log! (format "DEF " (%ident def-ident)))]]
-    (commonT;record-artifact (format bytecode-name ".class") bytecode)))
+      _
+      (do @
+        [#let [normal-name (format (&;normalize-name def-name) (%n (text/hash def-name)))
+               bytecode-name (format current-module "/" normal-name)
+               class-name (format (text;replace-all "/" "." current-module) "." normal-name)
+               bytecode ($d;class #$;V1.6
+                                  #$;Public $;finalC
+                                  bytecode-name
+                                  (list) ["java.lang.Object" (list)]
+                                  (list)
+                                  (|>. ($d;field #$;Public ($;++F $;finalF $;staticF) commonT;value-field commonT;$Object)
+                                       ($d;method #$;Public $;staticM "<clinit>" ($t;method (list) #;None (list))
+                                                  (|>. valueI
+                                                       ($i;PUTSTATIC bytecode-name commonT;value-field commonT;$Object)
+                                                       $i;RETURN))))]
+         _ (commonT;store-class class-name bytecode)
+         class (commonT;load-class class-name)
+         valueV (: (Meta Top)
+                   (case (do e;Monad<Error>
+                           [field (Class.getField [commonT;value-field] class)]
+                           (Field.get [#;None] field))
+                     (#e;Success #;None)
+                     (&;throw Invalid-Definition-Value (%ident def-ident))
+                     
+                     (#e;Success (#;Some valueV))
+                     (wrap valueV)
+                     
+                     (#e;Error error)
+                     (&;throw Cannot-Evaluate-Definition
+                              (format "Definition: " (%ident def-ident) "\n"
+                                      "Error:\n"
+                                      error))))
+         _ (&module;define def-ident [valueT metaV valueV])
+         _ (if (macro;type? metaV)
+             (case (macro;declared-tags metaV)
+               #;Nil
+               (wrap [])
+
+               tags
+               (&module;declare-tags tags (macro;export? metaV) (:! Type valueV)))
+             (wrap []))
+         #let [_ (log! (format "DEF " (%ident def-ident)))]]
+        (commonT;record-artifact (format bytecode-name ".class") bytecode)))))
 
 (def: #export (translate-program program-args programI)
   (-> Text $;Inst (Meta Unit))