Done with Ruby.

30 files changed, 1637 insertions, 351 deletions

diff --git a/compilers.md b/compilers.md
index 0bea1a06c..3e70d6137 100644
--- a/compilers.md
+++ b/compilers.md
@@ -198,25 +198,25 @@ cd ~/lux/stdlib/ \
 
 ---
 
-# PHP compiler
+# Ruby compiler
 
 ## Test
 
 ```
-cd ~/lux/lux-php/ && lein lux auto test
-cd ~/lux/lux-php/ && lein clean && lein lux auto test
+cd ~/lux/lux-ruby/ && lein lux auto test
+cd ~/lux/lux-ruby/ && lein clean && lein lux auto test
 ```
 
 ## Build
 
 ```
 ## Develop
-cd ~/lux/lux-php/ \
+cd ~/lux/lux-ruby/ \
 && lein clean \
 && lein lux auto build
 
 ## Build JVM-based compiler
-cd ~/lux/lux-php/ \
+cd ~/lux/lux-ruby/ \
 && lein clean \
 && lein lux build \
 && mv target/program.jar jvm_based_compiler.jar
@@ -228,30 +228,32 @@ cd ~/lux/lux-php/ \
 ## Compile Lux's Standard Library's tests using a JVM-based compiler.
 cd ~/lux/stdlib/ \
 && lein clean \
-&& time java -jar ~/lux/lux-php/jvm_based_compiler.jar build --source ~/lux/stdlib/source --target ~/lux/stdlib/target --module test/lux
+&& time java -jar ~/lux/lux-ruby/target/program.jar build --source ~/lux/stdlib/source --target ~/lux/stdlib/target --module test/lux
+
+RUBY_THREAD_VM_STACK_SIZE=15700000 ruby ~/lux/stdlib/target/program.rb
 ```
 
 ---
 
-# Ruby compiler
+# PHP compiler
 
 ## Test
 
 ```
-cd ~/lux/lux-ruby/ && lein lux auto test
-cd ~/lux/lux-ruby/ && lein clean && lein lux auto test
+cd ~/lux/lux-php/ && lein lux auto test
+cd ~/lux/lux-php/ && lein clean && lein lux auto test
 ```
 
 ## Build
 
 ```
 ## Develop
-cd ~/lux/lux-ruby/ \
+cd ~/lux/lux-php/ \
 && lein clean \
 && lein lux auto build
 
 ## Build JVM-based compiler
-cd ~/lux/lux-ruby/ \
+cd ~/lux/lux-php/ \
 && lein clean \
 && lein lux build \
 && mv target/program.jar jvm_based_compiler.jar
@@ -263,7 +265,7 @@ cd ~/lux/lux-ruby/ \
 ## Compile Lux's Standard Library's tests using a JVM-based compiler.
 cd ~/lux/stdlib/ \
 && lein clean \
-&& time java -jar ~/lux/lux-ruby/jvm_based_compiler.jar build --source ~/lux/stdlib/source --target ~/lux/stdlib/target --module test/lux
+&& time java -jar ~/lux/lux-php/jvm_based_compiler.jar build --source ~/lux/stdlib/source --target ~/lux/stdlib/target --module test/lux
 ```
 
 ---
diff --git a/lux-ruby/source/program.lux b/lux-ruby/source/program.lux
index 044e97923..64a34c003 100644
--- a/lux-ruby/source/program.lux
+++ b/lux-ruby/source/program.lux
@@ -29,6 +29,7 @@
    [math
     [number
      ["n" nat]
+     ["i" int]
      ["." i64]]]
    ["." world #_
     ["." file]
@@ -90,6 +91,10 @@
    (#static newInternalFromJavaExternal [org/jruby/Ruby java/lang/String] org/jruby/RubyString)
    (asJavaString [] java/lang/String)])
 
+(import: org/jruby/RubySymbol
+  ["#::."
+   (asJavaString [] java/lang/String)])
+
 (import: org/jruby/runtime/builtin/IRubyObject)
 
 (import: org/jruby/Ruby
@@ -110,6 +115,11 @@
 
 (import: org/jruby/runtime/ThreadContext)
 
+(import: org/jruby/RubyRange
+  ["#::."
+   (first [org/jruby/runtime/ThreadContext] org/jruby/runtime/builtin/IRubyObject)
+   (size [org/jruby/runtime/ThreadContext] org/jruby/runtime/builtin/IRubyObject)])
+
 (template [<name>]
   [(host.interface: <name>
      (getValue [] java/lang/Object))
@@ -311,6 +321,18 @@
   (exception.report
    ["Index" (%.nat index)]))
 
+(exception: (invalid_index {index java/lang/Object})
+  (exception.report
+   ["Class" (|> index
+                java/lang/Object::getClass
+                java/lang/Object::toString)]
+   ["Index" (|> index
+                java/lang/Object::toString)]))
+
+(import: java/util/Arrays
+  ["#::."
+   (#static [t] copyOfRange [[t] int int] [t])])
+
 (def: (lux_wrapper_access lux_structure value)
   (-> (-> (Array java/lang/Object) org/jruby/runtime/builtin/IRubyObject)
       (-> (Array java/lang/Object) org/jruby/internal/runtime/methods/DynamicMethod))
@@ -327,48 +349,61 @@
               {block org/jruby/runtime/Block})
      org/jruby/runtime/builtin/IRubyObject
      (let [member (host.array_read 0 args)]
-       (case (host.check org/jruby/RubyFixnum member)
-         (#.Some member)
-         (case (array.read (org/jruby/RubyFixnum::getLongValue member) value)
-           (#.Some value)
-           (wrapped_lux_value lux_structure value)
-
-           #.None
-           (error! (exception.construct ..invalid_tuple_access [(org/jruby/RubyFixnum::getLongValue member)])))
-
-         #.None
-         (case (host.check org/jruby/RubyString member)
-           (#.Some member)
-           (case (:coerce Text (org/jruby/RubyString::asJavaString member))
-             (^ (static runtime.variant_tag_field))
-             (|> value
-                 (array.read 0)
-                 maybe.assume
-                 (:coerce java/lang/Integer)
-                 java/lang/Integer::longValue
-                 (org/jruby/RubyFixnum::new ..initial_ruby_runtime))
-
-             (^ (static runtime.variant_flag_field))
-             (case (array.read 1 value)
-               #.None
-               ..ruby_nil
-               
-               (#.Some flag)
-               ..lux_unit)
-             
-             (^ (static runtime.variant_value_field))
-             (case (array.read 2 value)
+       (<| (case (host.check org/jruby/RubyFixnum member)
+             (#.Some member)
+             (case (array.read (org/jruby/RubyFixnum::getLongValue member) value)
                (#.Some value)
                (wrapped_lux_value lux_structure value)
 
                #.None
-               (error! (exception.construct ..nil_has_no_lux_representation [])))
+               (error! (exception.construct ..invalid_tuple_access [(org/jruby/RubyFixnum::getLongValue member)])))
+
+             #.None)
+           (case (host.check org/jruby/RubyString member)
+             (#.Some member)
+             (case (:coerce Text (org/jruby/RubyString::asJavaString member))
+               (^ (static runtime.variant_tag_field))
+               (|> value
+                   (array.read 0)
+                   maybe.assume
+                   (:coerce java/lang/Integer)
+                   java/lang/Integer::longValue
+                   (org/jruby/RubyFixnum::new ..initial_ruby_runtime))
+
+               (^ (static runtime.variant_flag_field))
+               (case (array.read 1 value)
+                 #.None
+                 ..ruby_nil
+                 
+                 (#.Some flag)
+                 ..lux_unit)
+               
+               (^ (static runtime.variant_value_field))
+               (case (array.read 2 value)
+                 (#.Some value)
+                 (wrapped_lux_value lux_structure value)
 
-             field
-             (error! (exception.construct ..invalid_variant_access [field])))
-           
-           #.None
-           (error! (format "lux_wrapper_access INVALID INDEX"))))))))
+                 #.None
+                 (error! (exception.construct ..nil_has_no_lux_representation [])))
+
+               field
+               (error! (exception.construct ..invalid_variant_access [field])))
+             
+             #.None)
+           (case (host.check org/jruby/RubyRange member)
+             (#.Some member)
+             (case [(|> member (org/jruby/RubyRange::first thread_context) (host.check org/jruby/RubyFixnum))
+                    (|> member (org/jruby/RubyRange::size thread_context) (host.check org/jruby/RubyFixnum))]
+               [(#.Some first) (#.Some size)]
+               (let [first (org/jruby/RubyFixnum::getLongValue first)
+                     size (org/jruby/RubyFixnum::getLongValue size)]
+                 (lux_structure (java/util/Arrays::copyOfRange value first (i.+ first size))))
+
+               _
+               (error! (exception.construct ..invalid_index (:coerce java/lang/Object member))))
+
+             #.None)
+           (error! (exception.construct ..invalid_index (:coerce java/lang/Object member))))))))
 
 (def: (lux_wrapper_equality value)
   (-> (Array java/lang/Object) org/jruby/internal/runtime/methods/DynamicMethod)
@@ -410,6 +445,63 @@
          array.size
          (org/jruby/RubyFixnum::new ..initial_ruby_runtime)))))
 
+(def: (lux_wrapper_to_s value)
+  (-> (Array java/lang/Object) org/jruby/internal/runtime/methods/DynamicMethod)
+  (host.object [] org/jruby/internal/runtime/methods/DynamicMethod []
+    [{java/lang/String "to_s"}]
+
+    (org/jruby/internal/runtime/methods/DynamicMethod
+     [] (call self
+              {thread_context org/jruby/runtime/ThreadContext}
+              {self org/jruby/runtime/builtin/IRubyObject}
+              {module org/jruby/RubyModule}
+              {method java/lang/String}
+              {args [org/jruby/runtime/builtin/IRubyObject]}
+              {block org/jruby/runtime/Block})
+     org/jruby/runtime/builtin/IRubyObject
+     (|> value
+         debug.inspect
+         (org/jruby/RubyString::newInternalFromJavaExternal ..initial_ruby_runtime)))))
+
+(exception: (invalid_operation {method Text})
+  (exception.report
+   ["Method" (%.text method)]))
+
+(def: (lux_wrapper_respond_to? value)
+  (-> (Array java/lang/Object) org/jruby/internal/runtime/methods/DynamicMethod)
+  (host.object [] org/jruby/internal/runtime/methods/DynamicMethod []
+    [{java/lang/String "respond_to?"}]
+
+    (org/jruby/internal/runtime/methods/DynamicMethod
+     [] (call self
+              {thread_context org/jruby/runtime/ThreadContext}
+              {self org/jruby/runtime/builtin/IRubyObject}
+              {module org/jruby/RubyModule}
+              {method java/lang/String}
+              {args [org/jruby/runtime/builtin/IRubyObject]}
+              {block org/jruby/runtime/Block})
+     org/jruby/runtime/builtin/IRubyObject
+     (case (|> args
+               (host.array_read 0)
+               (host.check org/jruby/RubySymbol))
+       (#.Some method)
+       (|> (case (|> method
+                     org/jruby/RubySymbol::asJavaString
+                     (:coerce Text))
+             (^or "==" "equal?"
+                  "to_s" "inspect"
+                  "[]" "length" "respond_to?"
+                  ## "to_hash"
+                  )
+             true
+             
+             _
+             false)
+           (org/jruby/RubyBoolean::newBoolean ..initial_ruby_runtime))
+
+       #.None
+       (error! (exception.construct ..invalid_operation ["respond_to?"]))))))
+
 (exception: (unknown_method {method Text})
   (exception.report
    ["Method" (%.text method)]))
@@ -428,12 +520,18 @@
                         "[]"
                         (org/jruby/runtime/callsite/CacheEntry::new (..lux_wrapper_access lux_structure value) 0)
 
-                        "=="
+                        (^or "==" "equal?")
                         (org/jruby/runtime/callsite/CacheEntry::new (..lux_wrapper_equality value) 1)
 
                         "length"
                         (org/jruby/runtime/callsite/CacheEntry::new (..lux_wrapper_length value) 2)
 
+                        (^or "to_s" "inspect")
+                        (org/jruby/runtime/callsite/CacheEntry::new (..lux_wrapper_to_s value) 3)
+
+                        "respond_to?"
+                        (org/jruby/runtime/callsite/CacheEntry::new (..lux_wrapper_respond_to? value) 4)
+
                         _
                         (error! (exception.construct ..unknown_method [(:coerce Text method)])))))]
     (org/jruby/java/proxies/JavaProxy::new ..initial_ruby_runtime meta_class (:coerce java/lang/Object value))))
@@ -519,7 +617,7 @@
                 (run! (_.global (reference.artifact context))))))))))
 
 (def: platform
-  (IO (Platform _.LVar _.Expression _.Statement))
+  (IO (Platform Register _.Expression _.Statement))
   (do io.monad
     [host ..host]
     (wrap {#platform.&file_system (file.async file.default)
@@ -530,9 +628,9 @@
 
 (def: (program context program)
   (Program _.Expression _.Statement)
-  (_.statement (_.apply/* (list (runtime.lux//program_args _.command_line_arguments)
-                                _.nil)
-                          program)))
+  (_.statement (_.apply_lambda/* (list (runtime.lux//program_args _.command_line_arguments)
+                                       _.nil)
+                                 program)))
 
 (def: extender
   Extender
@@ -564,14 +662,6 @@
   (-> Any (Promise Any))
   (promise.future (\ world/program.default exit +0)))
 
-(def: (scope body!)
-  (-> _.Statement _.Statement)
-  (let [@program (_.local "lux_program")]
-    ($_ _.then
-        (_.function @program (list) body!)
-        (_.statement (_.apply/* (list) @program))
-        )))
-
 (program: [{service /cli.service}]
   (let [extension ".rb"]
     (exec (do promise.monad
@@ -585,15 +675,13 @@
                            generation.bundle
                            extension/bundle.empty
                            ..program
-                           [_.LVar
-                            _.Expression
-                            _.Statement]
+                           [Register _.Expression _.Statement]
                            ..extender
                            service
                            [(packager.package (: _.Statement (_.manual ""))
                                               _.code
                                               _.then
-                                              ..scope)
+                                              (|>>))
                             (format (/cli.target service)
                                     (\ file.default separator)
                                     "program"
diff --git a/stdlib/source/lux.lux b/stdlib/source/lux.lux
index c18603b4b..1bb7efa07 100644
--- a/stdlib/source/lux.lux
+++ b/stdlib/source/lux.lux
@@ -5281,6 +5281,8 @@
 
     _
     (\ meta_monad return token)
+    ## TODO: Figure out why this doesn't work:
+    ## (\ meta_monad wrap token)
     ))
 
 (macro: #export (static tokens)
diff --git a/stdlib/source/lux/control/concurrency/atom.lux b/stdlib/source/lux/control/concurrency/atom.lux
index 3b57678fc..350554437 100644
--- a/stdlib/source/lux/control/concurrency/atom.lux
+++ b/stdlib/source/lux/control/concurrency/atom.lux
@@ -25,15 +25,18 @@
 
 (with_expansions [<new> (for {@.js "js array new"
                               @.python "python array new"
-                              @.lua "lua array new"}
+                              @.lua "lua array new"
+                              @.ruby "ruby array new"}
                              (as_is))
                   <write> (for {@.js "js array write"
                                 @.python "python array write"
-                                @.lua "lua array write"}
+                                @.lua "lua array write"
+                                @.ruby "ruby array write"}
                                (as_is))
                   <read> (for {@.js "js array read"
                                @.python "python array read"
-                               @.lua "lua array read"}
+                               @.lua "lua array read"
+                               @.ruby "ruby array read"}
                               (as_is))]
   (abstract: #export (Atom a)
     (with_expansions [<jvm> (java/util/concurrent/atomic/AtomicReference a)]
diff --git a/stdlib/source/lux/control/thread.lux b/stdlib/source/lux/control/thread.lux
index 8e707e6d2..6be40ef63 100644
--- a/stdlib/source/lux/control/thread.lux
+++ b/stdlib/source/lux/control/thread.lux
@@ -44,7 +44,8 @@
 
             @.js ("js array read" 0 (:representation box))
             @.python ("python array read" 0 (:representation box))
-            @.lua ("lua array read" 0 (:representation box))})))
+            @.lua ("lua array read" 0 (:representation box))
+            @.ruby ("ruby array read" 0 (:representation box))})))
 
   (def: #export (write value box)
     (All [a] (-> a (All [!] (-> (Box ! a) (Thread ! Any)))))
diff --git a/stdlib/source/lux/data/collection/array.lux b/stdlib/source/lux/data/collection/array.lux
index 0bc661941..b9162e53a 100644
--- a/stdlib/source/lux/data/collection/array.lux
+++ b/stdlib/source/lux/data/collection/array.lux
@@ -47,7 +47,8 @@
 
           @.js ("js array new" size)
           @.python ("python array new" size)
-          @.lua ("lua array new" size)}))
+          @.lua ("lua array new" size)
+          @.ruby ("ruby array new" size)}))
 
   (def: #export (size array)
     (All [a] (-> (Array a) Nat))
@@ -65,7 +66,8 @@
 
           @.js ("js array length" array)
           @.python ("python array length" array)
-          @.lua ("lua array length" array)}))
+          @.lua ("lua array length" array)
+          @.ruby ("ruby array length" array)}))
 
   (template: (!read <read> <null?>)
     (let [output (<read> index array)]
@@ -93,7 +95,8 @@
 
             @.js (!read "js array read" "js object undefined?")
             @.python (!read "python array read" "python object none?")
-            @.lua (!read "lua array read" "lua object nil?")})
+            @.lua (!read "lua array read" "lua object nil?")
+            @.ruby (!read "ruby array read" "ruby object nil?")})
       #.None))
 
   (def: #export (write! index value array)
@@ -110,7 +113,8 @@
 
           @.js ("js array write" index value array)
           @.python ("python array write" index value array)
-          @.lua ("lua array write" index value array)}))
+          @.lua ("lua array write" index value array)
+          @.ruby ("ruby array write" index value array)}))
 
   (def: #export (delete! index array)
     (All [a]
@@ -124,7 +128,8 @@
 
             @.js ("js array delete" index array)
             @.python ("python array delete" index array)
-            @.lua ("lua array delete" index array)})
+            @.lua ("lua array delete" index array)
+            @.ruby ("ruby array delete" index array)})
       array))
   )
 
diff --git a/stdlib/source/lux/data/text/encoding.lux b/stdlib/source/lux/data/text/encoding.lux
index 55afc77ed..88bbea138 100644
--- a/stdlib/source/lux/data/text/encoding.lux
+++ b/stdlib/source/lux/data/text/encoding.lux
@@ -192,7 +192,16 @@
                
                (host.import: TextDecoder
                  (new [host.String])
-                 (decode [Uint8Array] host.String)))}
+                 (decode [Uint8Array] host.String)))
+
+        @.ruby
+        (as_is (host.import: String #as RubyString
+                 (encode [Text] RubyString)
+                 (force_encoding [Text] Text)
+                 (bytes [] Binary))
+
+               (host.import: Array #as RubyArray
+                 (pack [Text] RubyString)))}
        (as_is)))
 
 (def: (utf8\encode value)
@@ -224,10 +233,16 @@
               )
 
         @.python
-        (:coerce Binary ("python apply" (:assume ("python constant" "bytearray")) value "utf-8"))}
+        (:coerce Binary ("python apply" (:assume ("python constant" "bytearray")) value "utf-8"))
 
-       ## Default
-       ("lua utf8 encode" value)))
+        @.lua
+        ("lua utf8 encode" value)
+
+        @.ruby
+        (|> value
+            (:coerce RubyString)
+            (RubyString::encode ["UTF-8"])
+            (RubyString::bytes []))}))
 
 (def: (utf8\decode value)
   (-> Binary (Try Text))
@@ -252,10 +267,18 @@
                     #try.Success))
 
           @.python
-          (host.try (:coerce Text ("python object do" "decode" (:assume value) "utf-8")))}
+          (host.try (:coerce Text ("python object do" "decode" (:assume value) "utf-8")))
+
+          @.lua
+          (#try.Success ("lua utf8 decode" value))
 
-         ## Default
-         (#try.Success ("lua utf8 decode" value)))))
+          @.ruby
+          (|> value
+              (:coerce RubyArray)
+              (RubyArray::pack ["C*"])
+              (:coerce RubyString)
+              (RubyString::force_encoding ["UTF-8"])
+              #try.Success)})))
 
 (structure: #export utf8
   (Codec Binary Text)
diff --git a/stdlib/source/lux/data/text/format.lux b/stdlib/source/lux/data/text/format.lux
index 2232e0b6d..c67ce2030 100644
--- a/stdlib/source/lux/data/text/format.lux
+++ b/stdlib/source/lux/data/text/format.lux
@@ -16,7 +16,7 @@
      ["." json]]
     [collection
      ["." list ("#\." monad)]]]
-   [time
+   ["." time
     ["." instant]
     ["." duration]
     ["." date]]
@@ -62,16 +62,21 @@
   [rev      Rev               (\ rev.decimal encode)]
   [frac     Frac              (\ frac.decimal encode)]
   [ratio    ratio.Ratio       (\ ratio.codec encode)]
+  
   [text     Text              text.format]
+  
   [name     Name              (\ name.codec encode)]
+  [location Location          location.format]
   [code     Code              code.format]
   [type     Type              type.format]
+  
   [xml      xml.XML           (\ xml.codec encode)]
   [json     json.JSON         (\ json.codec encode)]
+  
   [instant  instant.Instant   (\ instant.codec encode)]
   [duration duration.Duration (\ duration.codec encode)]
   [date     date.Date         (\ date.codec encode)]
-  [location Location          location.format]
+  [time     time.Time         (\ time.codec encode)]
   )
 
 (template [<type> <format>,<codec>]
diff --git a/stdlib/source/lux/debug.lux b/stdlib/source/lux/debug.lux
index 8006c83dd..47d62fd34 100644
--- a/stdlib/source/lux/debug.lux
+++ b/stdlib/source/lux/debug.lux
@@ -79,7 +79,13 @@
                (import: (tostring [.Any] host.String))
 
                (import: math
-                 (#static type [.Any] #? host.String)))}))
+                 (#static type [.Any] #? host.String)))
+
+        @.ruby
+        (as_is (import: Class)
+
+               (import: Object
+                 (type [] Class)))}))
 
 (def: Inspector (-> Any Text))
 
@@ -230,6 +236,41 @@
 
             _
             (..tostring value))
+
+          @.ruby
+          (template.with [(class_of <literal>)
+                          (Object::type (:coerce ..Object <literal>))]
+            (let [value_class (Object::type (:coerce ..Object value))]
+              (`` (cond (~~ (template [<literal> <type> <format>]
+                              [(is? (class_of <literal>) value_class)
+                               (|> value (:coerce <type>) <format>)]
+
+                              [#0 Bit %.bit]
+                              [#1 Bit %.bit]
+                              [+123 Int %.int]
+                              [+123.456 Frac %.frac]
+                              ["+123.456" Text %.text]
+                              [("ruby object nil") Any (new> "nil" [])]
+                              ))
+
+                        (is? (class_of #.None) value_class)
+                        (let [variant_tag ("ruby object get" "_lux_tag" value)
+                              variant_flag ("ruby object get" "_lux_flag" value)
+                              variant_value ("ruby object get" "_lux_value" value)]
+                          (if (not (or ("ruby object nil?" variant_tag)
+                                       ("ruby object nil?" variant_flag)
+                                       ("ruby object nil?" variant_value)))
+                            (|> (format (|> variant_tag (:coerce .Int) %.int)
+                                        " " (%.bit (not ("ruby object nil?" variant_flag)))
+                                        " " (inspect variant_value))
+                                (text.enclose ["(" ")"]))
+                            (inspect_tuple inspect value)))
+
+                        (is? (class_of [[] []]) value_class)
+                        (inspect_tuple inspect value)
+
+                        ## else
+                        (:coerce Text ("ruby object do" "to_s" value))))))
           })))
 
 (exception: #export (cannot_represent_value {type Type})
diff --git a/stdlib/source/lux/host.rb.lux b/stdlib/source/lux/host.rb.lux
new file mode 100644
index 000000000..63f14e8a3
--- /dev/null
+++ b/stdlib/source/lux/host.rb.lux
@@ -0,0 +1,334 @@
+(.module:
+  [lux (#- Alias)
+   ["." meta]
+   ["@" target]
+   [abstract
+    [monad (#+ do)]]
+   [control
+    ["." io]
+    ["<>" parser ("#\." monad)
+     ["<.>" code (#+ Parser)]]]
+   [data
+    ["." product]
+    ["." maybe]
+    ["." text
+     ["%" format (#+ format)]]
+    [collection
+     ["." list ("#\." functor fold)]]]
+   [type
+    abstract]
+   [macro (#+ with_gensyms)
+    [syntax (#+ syntax:)]
+    ["." code]
+    ["." template]]])
+
+(abstract: #export (Object brand) Any)
+
+(template [<name>]
+  [(with_expansions [<brand> (template.identifier [<name> "'"])]
+     (abstract: #export <brand> Any)
+     (type: #export <name>
+       (..Object <brand>)))]
+
+  [Nil]
+  [Function]
+  )
+
+(template [<name> <type>]
+  [(type: #export <name>
+     <type>)]
+
+  [Boolean Bit]
+  [Integer Int]
+  [Float   Frac]
+  [String  Text]
+  )
+
+(type: Nilable
+  [Bit Code])
+
+(def: nilable
+  (Parser Nilable)
+  (let [token (' #?)]
+    (<| (<>.and (<>.parses? (<code>.this! token)))
+        (<>.after (<>.not (<code>.this! token)))
+        <code>.any)))
+
+(type: Alias
+  Text)
+
+(def: alias
+  (Parser Alias)
+  (<>.after (<code>.this! (' #as)) <code>.local_identifier))
+
+(type: Field
+  [Bit Text (Maybe Alias) Nilable])
+
+(def: static!
+  (Parser Any)
+  (<code>.this! (' #static)))
+
+(def: field
+  (Parser Field)
+  (<code>.form ($_ <>.and
+                   (<>.parses? ..static!)
+                   <code>.local_identifier
+                   (<>.maybe ..alias)
+                   ..nilable)))
+
+(def: constant
+  (Parser Field)
+  (<code>.form ($_ <>.and
+                   (<>\wrap true)
+                   <code>.local_identifier
+                   (<>.maybe ..alias)
+                   ..nilable)))
+
+(type: Common_Method
+  {#name Text
+   #alias (Maybe Alias)
+   #inputs (List Nilable)
+   #io? Bit
+   #try? Bit
+   #output Nilable})
+
+(type: Static_Method Common_Method)
+(type: Virtual_Method Common_Method)
+
+(type: Method
+  (#Static Static_Method)
+  (#Virtual Virtual_Method))
+
+(def: common_method
+  (Parser Common_Method)
+  ($_ <>.and
+      <code>.local_identifier
+      (<>.maybe ..alias)
+      (<code>.tuple (<>.some ..nilable))
+      (<>.parses? (<code>.this! (' #io)))
+      (<>.parses? (<code>.this! (' #try)))
+      ..nilable))
+
+(def: static_method
+  (<>.after ..static! ..common_method))
+
+(def: method
+  (Parser Method)
+  (<code>.form (<>.or ..static_method
+                      ..common_method)))
+
+(type: Member
+  (#Field Field)
+  (#Method Method))
+
+(def: member
+  (Parser Member)
+  ($_ <>.or
+      ..field
+      ..method
+      ))
+
+(def: input_variables
+  (-> (List Nilable) (List [Bit Code]))
+  (|>> list.enumeration
+       (list\map (function (_ [idx [nilable? type]])
+                   [nilable? (|> idx %.nat code.local_identifier)]))))
+
+(def: (nilable_type [nilable? type])
+  (-> Nilable Code)
+  (if nilable?
+    (` (.Maybe (~ type)))
+    type))
+
+(def: (with_nil g!temp [nilable? input])
+  (-> Code [Bit Code] Code)
+  (if nilable?
+    (` (case (~ input)
+         (#.Some (~ g!temp))
+         (~ g!temp)
+
+         #.Nil
+         ("ruby object nil")))
+    input))
+
+(def: (without_nil g!temp [nilable? outputT] output)
+  (-> Code Nilable Code Code)
+  (if nilable?
+    (` (let [(~ g!temp) (~ output)]
+         (if ("ruby object nil?" (~ g!temp))
+           #.None
+           (#.Some (~ g!temp)))))
+    (` (let [(~ g!temp) (~ output)]
+         (if (not ("ruby object nil?" (~ g!temp)))
+           (~ g!temp)
+           (.error! "Nil is an invalid value!"))))))
+
+(type: Import
+  (#Class Text (Maybe Alias) (List Member))
+  (#Function Static_Method)
+  (#Constant Field))
+
+(def: import
+  (Parser [(Maybe Text) Import])
+  ($_ <>.and
+      (<>.maybe <code>.text)
+      ($_ <>.or
+          ($_ <>.and
+              <code>.local_identifier
+              (<>.maybe ..alias)
+              (<>.some member))
+          (<code>.form ..common_method)
+          ..constant
+          )))
+
+(syntax: #export (try expression)
+  {#.doc (doc (case (try (risky_computation input))
+                (#.Right success)
+                (do_something success)
+
+                (#.Left error)
+                (recover_from_failure error)))}
+  (wrap (list (` ("lux try" ((~! io.io) (~ expression)))))))
+
+(def: (with_io with? without)
+  (-> Bit Code Code)
+  (if with?
+    (` (io.io (~ without)))
+    without))
+
+(def: (io_type io? rawT)
+  (-> Bit Code Code)
+  (if io?
+    (` (io.IO (~ rawT)))
+    rawT))
+
+(def: (with_try with? without_try)
+  (-> Bit Code Code)
+  (if with?
+    (` (..try (~ without_try)))
+    without_try))
+
+(def: (try_type try? rawT)
+  (-> Bit Code Code)
+  (if try?
+    (` (.Either .Text (~ rawT)))
+    rawT))
+
+(def: (make_function g!method g!temp source inputsT io? try? outputT)
+  (-> Code Code Code (List Nilable) Bit Bit Nilable Code)
+  (let [g!inputs (input_variables inputsT)]
+    (` (def: ((~ g!method)
+              [(~+ (list\map product.right g!inputs))])
+         (-> [(~+ (list\map nilable_type inputsT))]
+             (~ (|> (nilable_type outputT)
+                    (try_type try?)
+                    (io_type io?))))
+         (:assume
+          (~ (<| (with_io io?)
+                 (with_try try?)
+                 (without_nil g!temp outputT)
+                 (` ("ruby apply"
+                     (:coerce ..Function (~ source))
+                     (~+ (list\map (with_nil g!temp) g!inputs)))))))))))
+
+(syntax: #export (import: {[?module import] ..import})
+  (with_gensyms [g!temp]
+    (case import
+      (#Class [class alias members])
+      (with_gensyms [g!object]
+        (let [qualify (: (-> Text Code)
+                         (|>> (format (maybe.default class alias) "::") code.local_identifier))
+              g!type (code.local_identifier (maybe.default class alias))
+              module_import (: (List Code)
+                               (case ?module
+                                 (#.Some module)
+                                 (list (` ("ruby import" (~ (code.text module)))))
+
+                                 #.None
+                                 (list)))
+              class_import (` ("ruby constant" (~ (code.text class))))]
+          (wrap (list& (` (type: (~ g!type)
+                            (..Object (primitive (~ (code.text class))))))
+                       (list\map (function (_ member)
+                                   (case member
+                                     (#Field [static? field alias fieldT])
+                                     (if static?
+                                       (` ((~! syntax:) ((~ (qualify (maybe.default field alias))))
+                                           (\ (~! meta.monad) (~' wrap)
+                                              (list (` (.:coerce (~ (nilable_type fieldT))
+                                                                 (.exec
+                                                                   (~+ module_import)
+                                                                   ("ruby constant" (~ (code.text (format class "::" field)))))))))))
+                                       (` (def: ((~ (qualify field))
+                                                 (~ g!object))
+                                            (-> (~ g!type)
+                                                (~ (nilable_type fieldT)))
+                                            (:assume
+                                             (~ (without_nil g!temp fieldT (` ("ruby object get" (~ (code.text field))
+                                                                               (:coerce (..Object .Any) (~ g!object))))))))))
+                                     
+                                     (#Method method)
+                                     (case method
+                                       (#Static [method alias inputsT io? try? outputT])
+                                       (..make_function (qualify (maybe.default method alias))
+                                                        g!temp
+                                                        (` ("ruby object get" (~ (code.text method))
+                                                            (:coerce (..Object .Any)
+                                                                     (.exec
+                                                                       (~+ module_import)
+                                                                       ("ruby constant" (~ (code.text (format class "::" method))))))))
+                                                        inputsT
+                                                        io?
+                                                        try?
+                                                        outputT)
+                                       
+                                       (#Virtual [method alias inputsT io? try? outputT])
+                                       (let [g!inputs (input_variables inputsT)]
+                                         (` (def: ((~ (qualify (maybe.default method alias)))
+                                                   [(~+ (list\map product.right g!inputs))]
+                                                   (~ g!object))
+                                              (-> [(~+ (list\map nilable_type inputsT))]
+                                                  (~ g!type)
+                                                  (~ (|> (nilable_type outputT)
+                                                         (try_type try?)
+                                                         (io_type io?))))
+                                              (:assume
+                                               (~ (<| (with_io io?)
+                                                      (with_try try?)
+                                                      (without_nil g!temp outputT)
+                                                      (` ("ruby object do"
+                                                          (~ (code.text method))
+                                                          (~ g!object)
+                                                          (~+ (list\map (with_nil g!temp) g!inputs)))))))))))))
+                                 members)))))
+      
+      (#Function [name alias inputsT io? try? outputT])
+      (let [imported (` (.exec
+                          (~+ (case ?module
+                                (#.Some module)
+                                (list (` ("ruby import" (~ (code.text module)))))
+
+                                #.None
+                                (list)))
+                          ("ruby constant" (~ (code.text name)))))]
+        (wrap (list (..make_function (code.local_identifier (maybe.default name alias))
+                                     g!temp
+                                     imported
+                                     inputsT
+                                     io?
+                                     try?
+                                     outputT))))
+
+      (#Constant [_ name alias fieldT])
+      (let [imported (` (.exec
+                          (~+ (case ?module
+                                (#.Some module)
+                                (list (` ("ruby import" (~ (code.text module)))))
+
+                                #.None
+                                (list)))
+                          ("ruby constant" (~ (code.text name)))))]
+        (wrap (list (` ((~! syntax:) ((~ (code.local_identifier (maybe.default name alias))))
+                        (\ (~! meta.monad) (~' wrap)
+                           (list (` (.:coerce (~ (nilable_type fieldT)) (~ imported))))))))))
+      )))
diff --git a/stdlib/source/lux/math.lux b/stdlib/source/lux/math.lux
index 1c4247ad2..7193b417f 100644
--- a/stdlib/source/lux/math.lux
+++ b/stdlib/source/lux/math.lux
@@ -175,7 +175,45 @@
 
              (def: #export root/3
                (-> Frac Frac)
-               (..pow ("lux f64 /" +3.0 +1.0))))})
+               (..pow ("lux f64 /" +3.0 +1.0))))
+
+      @.ruby
+      (as_is (template [<name> <method>]
+               [(def: #export <name>
+                  (-> Frac Frac)
+                  (|>> ("ruby apply" ("ruby constant" <method>))
+                       (:coerce Frac)))]
+
+               [cos   "Math.cos"]
+               [sin   "Math.sin"]
+               [tan   "Math.tan"]
+
+               [acos  "Math.acos"]
+               [asin  "Math.asin"]
+               [atan  "Math.atan"]
+               
+               [exp   "Math.exp"]
+               [log   "Math.log"]
+               
+               [root/2 "Math.sqrt"]
+               [root/3 "Math.cbrt"]
+               )
+
+             (template [<name> <method>]
+               [(def: #export <name>
+                  (-> Frac Frac)
+                  (|>> ("ruby object do" <method>)
+                       (:coerce Int)
+                       ("lux i64 f64")))]
+
+               [ceil  "ceil"]
+               [floor "floor"]
+               )
+
+             (def: #export (pow param subject)
+               (-> Frac Frac Frac)
+               (:coerce Frac ("ruby object do" "**" subject param))))
+      })
 
 (def: #export (round input)
   (-> Frac Frac)
diff --git a/stdlib/source/lux/target/ruby.lux b/stdlib/source/lux/target/ruby.lux
index e884d6c70..641cc8d2e 100644
--- a/stdlib/source/lux/target/ruby.lux
+++ b/stdlib/source/lux/target/ruby.lux
@@ -124,7 +124,8 @@
     )
 
   (template [<ruby_name> <lux_name>]
-    [(def: #export <lux_name> (..global <ruby_name>))]
+    [(def: #export <lux_name>
+       (..global <ruby_name>))]
 
     ["@" latest_error]
     ["_" last_string_read]
@@ -135,11 +136,17 @@
     ["/" input_record_separator]
     ["\" output_record_separator]
     ["0" script_name]
-    ["*" command_line_arguments]
     ["$" process_id]
     ["?" exit_status]
     )
 
+  (template [<ruby_name> <lux_name>]
+    [(def: #export <lux_name>
+       (..local <ruby_name>))]
+
+    ["ARGV" command_line_arguments]
+    )
+
   (def: #export nil
     Literal
     (:abstraction "nil"))
@@ -172,8 +179,9 @@
        (-> <type> Literal)
        (|>> <prep> <format> :abstraction))]
 
-    [%.int int Int     (<|)]
+    [%.int  int    Int  (<|)]
     [%.text string Text ..sanitize]
+    [(<|)   symbol Text (format ":")]
     )
 
   (def: #export float
@@ -323,6 +331,13 @@
                                         (..nest (:representation rescue)))))
                     (text.join_with text.new_line)))))
 
+  (def: #export (catch expectation body!)
+    (-> Expression Statement Statement)
+    (<| :abstraction
+        ..block
+        (format "catch(" (:representation expectation) ") do"
+                (..nest (:representation body!)))))
+
   (def: #export (return value)
     (-> Expression Statement)
     (:abstraction (format "return " (:representation value) ..statement_suffix)))
@@ -360,8 +375,7 @@
                                (list\map (|>> :representation))
                                (text.join_with ..input_separator)
                                (text.enclose' "|"))
-                           " "
-                           (:representation body!))
+                           (..nest (:representation body!)))
                    (text.enclose ["{" "}"])
                    (format "lambda "))]
       (|> (case name
@@ -401,9 +415,14 @@
     [">>" bit_shr]
     )
 
-  (def: #export (not subject)
-    (-> Expression Computation)
-    (:abstraction (format "(!" (:representation subject) ")")))
+  (template [<unary> <name>]
+    [(def: #export (<name> subject)
+       (-> Expression Computation)
+       (:abstraction (format "(" <unary> (:representation subject) ")")))]
+
+    ["!" not]
+    ["-" negate]
+    )
 
   (def: #export (comment commentary on)
     (All [brand] (-> Text (Code brand) (Code brand)))
@@ -448,11 +467,17 @@
        <definitions>))]
 
   [1
-   [["print"]]]
+   [["print"]
+    ["require"]]]
 
   [2
-   []]
+   [["print"]]]
 
   [3
-   []]
+   [["print"]]]
   )
+
+(def: #export throw/1
+  (-> Expression Statement)
+  (|>> (..apply/1 (..local "throw"))
+       ..statement))
diff --git a/stdlib/source/lux/tool/compiler/language/lux/phase/extension/analysis/lua.lux b/stdlib/source/lux/tool/compiler/language/lux/phase/extension/analysis/lua.lux
index 04df1bdbb..99154e105 100644
--- a/stdlib/source/lux/tool/compiler/language/lux/phase/extension/analysis/lua.lux
+++ b/stdlib/source/lux/tool/compiler/language/lux/phase/extension/analysis/lua.lux
@@ -28,8 +28,7 @@
        ["." phase]]]]]])
 
 (def: Nil
-  (for {@.lua
-        host.Nil}
+  (for {@.lua host.Nil}
        Any))
 
 (def: Object
@@ -222,7 +221,7 @@
         [_ (analysis/type.infer ..Object)]
         (wrap (#analysis.Extension extension (list (analysis.text name))))))]))
 
-(def: python::function
+(def: lua::function
   Handler
   (custom
    [($_ <>.and <c>.nat <c>.any)
@@ -247,6 +246,6 @@
           (bundle.install "apply" lua::apply)
           (bundle.install "power" lua::power)
           (bundle.install "import" lua::import)
-          (bundle.install "function" python::function)
+          (bundle.install "function" lua::function)
           (bundle.install "script universe" (/.nullary .Bit))
           )))
diff --git a/stdlib/source/lux/tool/compiler/language/lux/phase/extension/analysis/ruby.lux b/stdlib/source/lux/tool/compiler/language/lux/phase/extension/analysis/ruby.lux
index 3b9f4ad75..8bbd32b3c 100644
--- a/stdlib/source/lux/tool/compiler/language/lux/phase/extension/analysis/ruby.lux
+++ b/stdlib/source/lux/tool/compiler/language/lux/phase/extension/analysis/ruby.lux
@@ -27,8 +27,172 @@
       [///
        ["." phase]]]]]])
 
+(def: array::new
+  Handler
+  (custom
+   [<c>.any
+    (function (_ extension phase archive lengthC)
+      (do phase.monad
+        [lengthA (analysis/type.with_type Nat
+                   (phase archive lengthC))
+         [var_id varT] (analysis/type.with_env check.var)
+         _ (analysis/type.infer (type (Array varT)))]
+        (wrap (#analysis.Extension extension (list lengthA)))))]))
+
+(def: array::length
+  Handler
+  (custom
+   [<c>.any
+    (function (_ extension phase archive arrayC)
+      (do phase.monad
+        [[var_id varT] (analysis/type.with_env check.var)
+         arrayA (analysis/type.with_type (type (Array varT))
+                  (phase archive arrayC))
+         _ (analysis/type.infer Nat)]
+        (wrap (#analysis.Extension extension (list arrayA)))))]))
+
+(def: array::read
+  Handler
+  (custom
+   [(<>.and <c>.any <c>.any)
+    (function (_ extension phase archive [indexC arrayC])
+      (do phase.monad
+        [indexA (analysis/type.with_type Nat
+                  (phase archive indexC))
+         [var_id varT] (analysis/type.with_env check.var)
+         arrayA (analysis/type.with_type (type (Array varT))
+                  (phase archive arrayC))
+         _ (analysis/type.infer varT)]
+        (wrap (#analysis.Extension extension (list indexA arrayA)))))]))
+
+(def: array::write
+  Handler
+  (custom
+   [($_ <>.and <c>.any <c>.any <c>.any)
+    (function (_ extension phase archive [indexC valueC arrayC])
+      (do phase.monad
+        [indexA (analysis/type.with_type Nat
+                  (phase archive indexC))
+         [var_id varT] (analysis/type.with_env check.var)
+         valueA (analysis/type.with_type varT
+                  (phase archive valueC))
+         arrayA (analysis/type.with_type (type (Array varT))
+                  (phase archive arrayC))
+         _ (analysis/type.infer (type (Array varT)))]
+        (wrap (#analysis.Extension extension (list indexA valueA arrayA)))))]))
+
+(def: array::delete
+  Handler
+  (custom
+   [($_ <>.and <c>.any <c>.any)
+    (function (_ extension phase archive [indexC arrayC])
+      (do phase.monad
+        [indexA (analysis/type.with_type Nat
+                  (phase archive indexC))
+         [var_id varT] (analysis/type.with_env check.var)
+         arrayA (analysis/type.with_type (type (Array varT))
+                  (phase archive arrayC))
+         _ (analysis/type.infer (type (Array varT)))]
+        (wrap (#analysis.Extension extension (list indexA arrayA)))))]))
+
+(def: bundle::array
+  Bundle
+  (<| (bundle.prefix "array")
+      (|> bundle.empty
+          (bundle.install "new" array::new)
+          (bundle.install "length" array::length)
+          (bundle.install "read" array::read)
+          (bundle.install "write" array::write)
+          (bundle.install "delete" array::delete)
+          )))
+
+(def: Nil
+  (for {@.ruby host.Nil}
+       Any))
+
+(def: Object
+  (for {@.ruby (type (host.Object Any))}
+       Any))
+
+(def: Function
+  (for {@.ruby host.Function}
+       Any))
+
+(def: object::get
+  Handler
+  (custom
+   [($_ <>.and <c>.text <c>.any)
+    (function (_ extension phase archive [fieldC objectC])
+      (do phase.monad
+        [objectA (analysis/type.with_type ..Object
+                   (phase archive objectC))
+         _ (analysis/type.infer .Any)]
+        (wrap (#analysis.Extension extension (list (analysis.text fieldC)
+                                                   objectA)))))]))
+
+(def: object::do
+  Handler
+  (custom
+   [($_ <>.and <c>.text <c>.any (<>.some <c>.any))
+    (function (_ extension phase archive [methodC objectC inputsC])
+      (do {! phase.monad}
+        [objectA (analysis/type.with_type ..Object
+                   (phase archive objectC))
+         inputsA (monad.map ! (|>> (phase archive) (analysis/type.with_type Any)) inputsC)
+         _ (analysis/type.infer .Any)]
+        (wrap (#analysis.Extension extension (list& (analysis.text methodC)
+                                                    objectA
+                                                    inputsA)))))]))
+
+(def: bundle::object
+  Bundle
+  (<| (bundle.prefix "object")
+      (|> bundle.empty
+          (bundle.install "get" object::get)
+          (bundle.install "do" object::do)
+          (bundle.install "nil" (/.nullary ..Nil))
+          (bundle.install "nil?" (/.unary Any Bit))
+          )))
+
+(def: ruby::constant
+  Handler
+  (custom
+   [<c>.text
+    (function (_ extension phase archive name)
+      (do phase.monad
+        [_ (analysis/type.infer Any)]
+        (wrap (#analysis.Extension extension (list (analysis.text name))))))]))
+
+(def: ruby::apply
+  Handler
+  (custom
+   [($_ <>.and <c>.any (<>.some <c>.any))
+    (function (_ extension phase archive [abstractionC inputsC])
+      (do {! phase.monad}
+        [abstractionA (analysis/type.with_type ..Function
+                        (phase archive abstractionC))
+         inputsA (monad.map ! (|>> (phase archive) (analysis/type.with_type Any)) inputsC)
+         _ (analysis/type.infer Any)]
+        (wrap (#analysis.Extension extension (list& abstractionA inputsA)))))]))
+
+(def: ruby::import
+  Handler
+  (custom
+   [<c>.text
+    (function (_ extension phase archive name)
+      (do phase.monad
+        [_ (analysis/type.infer Bit)]
+        (wrap (#analysis.Extension extension (list (analysis.text name))))))]))
+
 (def: #export bundle
   Bundle
   (<| (bundle.prefix "ruby")
       (|> bundle.empty
+          (dictionary.merge bundle::array)
+          (dictionary.merge bundle::object)
+
+          (bundle.install "constant" ruby::constant)
+          (bundle.install "apply" ruby::apply)
+          (bundle.install "import" ruby::import)
+          (bundle.install "script universe" (/.nullary .Bit))
           )))
diff --git a/stdlib/source/lux/tool/compiler/language/lux/phase/extension/generation/ruby.lux b/stdlib/source/lux/tool/compiler/language/lux/phase/extension/generation/ruby.lux
index 8b1b94bbb..12bcfc9b1 100644
--- a/stdlib/source/lux/tool/compiler/language/lux/phase/extension/generation/ruby.lux
+++ b/stdlib/source/lux/tool/compiler/language/lux/phase/extension/generation/ruby.lux
@@ -5,6 +5,7 @@
      ["." dictionary]]]]
   ["." / #_
    ["#." common]
+   ["#." host]
    [////
     [generation
      [ruby
@@ -12,4 +13,5 @@
 
 (def: #export bundle
   Bundle
-  /common.bundle)
+  (dictionary.merge /common.bundle
+                    /host.bundle))
diff --git a/stdlib/source/lux/tool/compiler/language/lux/phase/extension/generation/ruby/common.lux b/stdlib/source/lux/tool/compiler/language/lux/phase/extension/generation/ruby/common.lux
index 9f04b35d2..50eddb998 100644
--- a/stdlib/source/lux/tool/compiler/language/lux/phase/extension/generation/ruby/common.lux
+++ b/stdlib/source/lux/tool/compiler/language/lux/phase/extension/generation/ruby/common.lux
@@ -47,34 +47,71 @@
       (#try.Failure error)
       (/////.throw extension.invalid_syntax [extension_name %synthesis input]))))
 
+## TODO: Get rid of this ASAP
+(def: lux::syntax_char_case!
+  (..custom [($_ <>.and
+                 <s>.any
+                 <s>.any
+                 (<>.some (<s>.tuple ($_ <>.and
+                                         (<s>.tuple (<>.many <s>.i64))
+                                         <s>.any))))
+             (function (_ extension_name phase archive [input else conditionals])
+               (do {! /////.monad}
+                 [inputG (phase archive input)
+                  elseG (phase archive else)
+                  @input (\ ! map _.local (generation.gensym "input"))
+                  conditionalsG (: (Operation (List [Expression Expression]))
+                                   (monad.map ! (function (_ [chars branch])
+                                                  (do !
+                                                    [branchG (phase archive branch)]
+                                                    (wrap [(|> chars
+                                                               (list\map (|>> .int _.int (_.= @input)))
+                                                               (list\fold (function (_ clause total)
+                                                                            (if (is? _.nil total)
+                                                                              clause
+                                                                              (_.or clause total)))
+                                                                          _.nil))
+                                                           branchG])))
+                                              conditionals))
+                  #let [closure (_.lambda #.None (list @input)
+                                          (list\fold (function (_ [test then] else)
+                                                       (_.if test (_.return then) else))
+                                                     (_.return elseG)
+                                                     conditionalsG))]]
+                 (wrap (_.apply_lambda/* (list inputG) closure))))]))
+
 (def: lux_procs
   Bundle
   (|> /.empty
-      (/.install "is" (binary (product.uncurry _.=)))
+      (/.install "syntax char case!" lux::syntax_char_case!)
+      (/.install "is" (binary (function (_ [reference subject])
+                                (_.do "equal?" (list reference) subject))))
       (/.install "try" (unary //runtime.lux//try))))
 
-(def: keep_i64
-  (All [input]
-    (-> (-> input Expression)
-        (-> input Expression)))
-  (function.compose (_.bit_and (_.manual "0xFFFFFFFFFFFFFFFF"))))
+(def: (capped operation parameter subject)
+  (-> (-> Expression Expression Expression)
+      (-> Expression Expression Expression))
+  (//runtime.i64//64 (operation parameter subject)))
 
 (def: i64_procs
   Bundle
   (<| (/.prefix "i64")
       (|> /.empty
-          (/.install "and" (binary (product.uncurry _.bit_and)))
-          (/.install "or" (binary (product.uncurry _.bit_or)))
-          (/.install "xor" (binary (product.uncurry _.bit_xor)))
-          (/.install "left-shift" (binary (..keep_i64 (product.uncurry _.bit_shl))))
-          (/.install "right-shift" (binary (product.uncurry //runtime.i64//logic_right_shift)))
-          (/.install "=" (binary (product.uncurry _.=)))
-          (/.install "+" (binary (..keep_i64 (product.uncurry _.+))))
-          (/.install "-" (binary (..keep_i64 (product.uncurry _.-))))
+          (/.install "and" (binary (product.uncurry //runtime.i64//and)))
+          (/.install "or" (binary (product.uncurry //runtime.i64//or)))
+          (/.install "xor" (binary (product.uncurry //runtime.i64//xor)))
+          (/.install "left-shift" (binary (product.uncurry //runtime.i64//left_shift)))
+          (/.install "right-shift" (binary (product.uncurry //runtime.i64//right_shift)))
+          
           (/.install "<" (binary (product.uncurry _.<)))
-          (/.install "*" (binary (..keep_i64 (product.uncurry _.*))))
-          (/.install "/" (binary (product.uncurry _./)))
-          (/.install "%" (binary (product.uncurry _.%)))
+          (/.install "=" (binary (product.uncurry _.=)))
+          (/.install "+" (binary (product.uncurry (..capped _.+))))
+          (/.install "-" (binary (product.uncurry (..capped _.-))))
+          (/.install "*" (binary (product.uncurry (..capped _.*))))
+          (/.install "/" (binary (product.uncurry //runtime.i64//division)))
+          (/.install "%" (binary (function (_ [parameter subject])
+                                   (_.do "remainder" (list parameter) subject))))
+          
           (/.install "f64" (unary (_./ (_.float +1.0))))
           (/.install "char" (unary (_.do "chr" (list (_.string "UTF-8")))))
           )))
@@ -87,10 +124,11 @@
           (/.install "-" (binary (product.uncurry _.-)))
           (/.install "*" (binary (product.uncurry _.*)))
           (/.install "/" (binary (product.uncurry _./)))
-          (/.install "%" (binary (product.uncurry _.%)))
+          (/.install "%" (binary (function (_ [parameter subject])
+                                   (_.do "remainder" (list parameter) subject))))
           (/.install "=" (binary (product.uncurry _.=)))
           (/.install "<" (binary (product.uncurry _.<)))
-          (/.install "int" (unary (_.do "floor" (list))))
+          (/.install "i64" (unary (_.do "floor" (list))))
           (/.install "encode" (unary (_.do "to_s" (list))))
           (/.install "decode" (unary //runtime.f64//decode)))))
 
@@ -100,7 +138,7 @@
 
 (def: (text//clip [paramO extraO subjectO])
   (Trinary Expression)
-  (//runtime.text//clip subjectO paramO extraO))
+  (//runtime.text//clip paramO extraO subjectO))
 
 (def: (text//index [startO partO textO])
   (Trinary Expression)
@@ -112,7 +150,7 @@
       (|> /.empty
           (/.install "=" (binary (product.uncurry _.=)))
           (/.install "<" (binary (product.uncurry _.<)))
-          (/.install "concat" (binary (product.uncurry _.+)))
+          (/.install "concat" (binary (product.uncurry (function.flip _.+))))
           (/.install "index" (trinary text//index))
           (/.install "size" (unary (_.the "length")))
           (/.install "char" (binary (product.uncurry //runtime.text//char)))
@@ -121,9 +159,8 @@
 
 (def: (io//log! messageG)
   (Unary Expression)
-  (_.or (_.apply/* (list (|> messageG (_.+ (_.string text.new_line))))
-                   (_.local "puts"))
-        //runtime.unit))
+  (_.or //runtime.unit
+        (_.print/2 messageG (_.string text.new_line))))
 
 (def: io//error!
   (Unary Expression)
diff --git a/stdlib/source/lux/tool/compiler/language/lux/phase/extension/generation/ruby/host.lux b/stdlib/source/lux/tool/compiler/language/lux/phase/extension/generation/ruby/host.lux
new file mode 100644
index 000000000..206034cd7
--- /dev/null
+++ b/stdlib/source/lux/tool/compiler/language/lux/phase/extension/generation/ruby/host.lux
@@ -0,0 +1,135 @@
+(.module:
+  [lux #*
+   [abstract
+    ["." monad (#+ do)]]
+   [control
+    ["." function]
+    ["<>" parser
+     ["<s>" synthesis (#+ Parser)]]]
+   [data
+    [collection
+     ["." dictionary]
+     ["." list]]
+    [text
+     ["%" format (#+ format)]]]
+   [target
+    ["_" ruby (#+ Var Expression)]]]
+  ["." // #_
+   ["#." common (#+ custom)]
+   ["//#" /// #_
+    ["/" bundle]
+    ["/#" // #_
+     ["." extension]
+     [generation
+      [extension (#+ Nullary Unary Binary Trinary
+                     nullary unary binary trinary)]
+      ["." reference]
+      ["//" ruby #_
+       ["#." runtime (#+ Operation Phase Handler Bundle
+                         with_vars)]]]
+     ["/#" // #_
+      ["." generation]
+      ["//#" /// #_
+       ["#." phase]]]]]])
+
+(def: (array::new [size])
+  (Unary Expression)
+  (_.do "new" (list size) (_.local "Array")))
+
+(def: array::length
+  (Unary Expression)
+  (_.the "size"))
+
+(def: (array::read [indexG arrayG])
+  (Binary Expression)
+  (_.nth indexG arrayG))
+
+(def: (array::write [indexG valueG arrayG])
+  (Trinary Expression)
+  (//runtime.array//write indexG valueG arrayG))
+
+(def: (array::delete [indexG arrayG])
+  (Binary Expression)
+  (//runtime.array//write indexG _.nil arrayG))
+
+(def: array
+  Bundle
+  (<| (/.prefix "array")
+      (|> /.empty
+          (/.install "new" (unary array::new))
+          (/.install "length" (unary array::length))
+          (/.install "read" (binary array::read))
+          (/.install "write" (trinary array::write))
+          (/.install "delete" (binary array::delete))
+          )))
+
+(def: object::get
+  Handler
+  (custom
+   [($_ <>.and <s>.text <s>.any)
+    (function (_ extension phase archive [fieldS objectS])
+      (do ////////phase.monad
+        [objectG (phase archive objectS)]
+        (wrap (_.the fieldS objectG))))]))
+
+(def: object::do
+  Handler
+  (custom
+   [($_ <>.and <s>.text <s>.any (<>.some <s>.any))
+    (function (_ extension phase archive [methodS objectS inputsS])
+      (do {! ////////phase.monad}
+        [objectG (phase archive objectS)
+         inputsG (monad.map ! (phase archive) inputsS)]
+        (wrap (_.do methodS inputsG objectG))))]))
+
+(template [<!> <?> <unit>]
+  [(def: <!> (Nullary Expression) (function.constant <unit>))
+   (def: <?> (Unary Expression) (_.= <unit>))]
+
+  [object::nil object::nil? _.nil]
+  )
+
+(def: object
+  Bundle
+  (<| (/.prefix "object")
+      (|> /.empty
+          (/.install "get" object::get)
+          (/.install "do" object::do)
+          (/.install "nil" (nullary object::nil))
+          (/.install "nil?" (unary object::nil?))
+          )))
+
+(def: ruby::constant
+  (custom
+   [<s>.text
+    (function (_ extension phase archive name)
+      (\ ////////phase.monad wrap (_.local name)))]))
+
+(def: ruby::apply
+  (custom
+   [($_ <>.and <s>.any (<>.some <s>.any))
+    (function (_ extension phase archive [abstractionS inputsS])
+      (do {! ////////phase.monad}
+        [abstractionG (phase archive abstractionS)
+         inputsG (monad.map ! (phase archive) inputsS)]
+        (wrap (_.apply/* inputsG abstractionG))))]))
+
+(def: ruby::import
+  (custom
+   [<s>.text
+    (function (_ extension phase archive module)
+      (\ ////////phase.monad wrap
+         (_.require/1 (_.string module))))]))
+
+(def: #export bundle
+  Bundle
+  (<| (/.prefix "ruby")
+      (|> /.empty
+          (dictionary.merge ..array)
+          (dictionary.merge ..object)
+
+          (/.install "constant" ruby::constant)
+          (/.install "apply" ruby::apply)
+          (/.install "import" ruby::import)
+          (/.install "script universe" (nullary (function.constant (_.bool reference.universe))))
+          )))
diff --git a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/python.lux b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/python.lux
index cdaabfc08..2e86ad107 100644
--- a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/python.lux
+++ b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/python.lux
@@ -26,8 +26,6 @@
        [reference (#+)
         [variable (#+)]]]]]]])
 
-(exception: #export cannot-recur-as-an-expression)
-
 (def: (statement expression archive synthesis)
   Phase!
   (case synthesis
@@ -60,6 +58,8 @@
     (//////phase\map _.return (/function.function statement expression archive abstraction))
     ))
 
+(exception: #export cannot-recur-as-an-expression)
+
 (def: #export (expression archive synthesis)
   Phase
   (case synthesis
diff --git a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/python/case.lux b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/python/case.lux
index eb6ae3e19..202e922c1 100644
--- a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/python/case.lux
+++ b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/python/case.lux
@@ -151,27 +151,29 @@
   [right_choice (_.string "") inc]
   )
 
-(def: (alternation in_closure? g!once pre! post!)
-  (-> Bit SVar (Statement Any) (Statement Any) (Statement Any))
+(def: (with_looping in_closure? g!once body!)
+  (-> Bit SVar (Statement Any) (Statement Any))
   (.if in_closure?
-    ($_ _.then
-        (_.while (_.bool true)
-                 ($_ _.then
-                     ..save!
-                     pre!)
-                 #.None)
-        ..restore!
-        post!)
+    (_.while (_.bool true)
+             body!
+             #.None)
     ($_ _.then
         (_.set (list g!once) (_.bool true))
         (_.while g!once
                  ($_ _.then
                      (_.set (list g!once) (_.bool false))
-                     ..save!
-                     pre!)
-                 (#.Some _.continue))
-        ..restore!
-        post!)))
+                     body!)
+                 (#.Some _.continue)))))
+
+(def: (alternation in_closure? g!once pre! post!)
+  (-> Bit SVar (Statement Any) (Statement Any) (Statement Any))
+  ($_ _.then
+      (..with_looping in_closure? g!once
+        ($_ _.then
+            ..save!
+            pre!))
+      ..restore!
+      post!))
 
 (def: (pattern_matching' in_closure? statement expression archive)
   (-> Bit Phase! Phase Archive Path (Operation (Statement Any)))
@@ -271,20 +273,10 @@
   (do ///////phase.monad
     [pattern_matching! (pattern_matching' in_closure? statement expression archive pathP)
      g!once (..gensym "once")]
-    (wrap (.if in_closure?
-            ($_ _.then
-                (_.while (_.bool true)
-                         pattern_matching!
-                         #.None)
-                (_.raise (_.Exception/1 (_.string case.pattern_matching_error))))
-            ($_ _.then
-                (_.set (list g!once) (_.bool true))
-                (_.while g!once
-                         ($_ _.then
-                             (_.set (list g!once) (_.bool false))
-                             pattern_matching!)
-                         (#.Some _.continue))
-                (_.raise (_.Exception/1 (_.string case.pattern_matching_error))))))))
+    (wrap ($_ _.then
+              (..with_looping in_closure? g!once
+                pattern_matching!)
+              (_.raise (_.Exception/1 (_.string case.pattern_matching_error)))))))
 
 (def: #export dependencies
   (-> Path (List SVar))
diff --git a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/python/runtime.lux b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/python/runtime.lux
index 933bcf6b0..1638a64ca 100644
--- a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/python/runtime.lux
+++ b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/python/runtime.lux
@@ -247,8 +247,8 @@
         test_recursion! (_.if is_last?
                           ## Must recurse.
                           ($_ _.then
-                              (_.set (list sum) sum_value)
-                              (_.set (list wantedTag) (_.- sum_tag wantedTag)))
+                              (_.set (list wantedTag) (_.- sum_tag wantedTag))
+                              (_.set (list sum) sum_value))
                           no_match!)]
     (<| (_.while (_.bool true))
         (_.cond (list [(_.= wantedTag sum_tag)
@@ -272,31 +272,12 @@
       @sum//get
       ))
 
-(runtime: i64//+limit
-  (|> (_.int +1)
-      (_.bit_shl (_.int +63))
-      (_.- (_.int +1))))
-
-(runtime: i64//-limit
-  (_.- (|> (_.int +1)
-           (_.bit_shl (_.int +63)))
-       (_.int +0)))
-
-(runtime: i64//+iteration
-  (|> (_.int +1)
-      (_.bit_shl (_.int +64))))
-
-(runtime: i64//-iteration
-  (|> ..i64//+iteration
-      _.negate))
-
-(runtime: i64//+cap
-  (|> ..i64//+limit
-      (_.+ (_.int +1))))
-
-(runtime: i64//-cap
-  (|> ..i64//-limit
-      (_.- (_.int +1))))
+(def: i64//+limit (_.manual "+0x7FFFFFFFFFFFFFFF"))
+(def: i64//-limit (_.manual "-0x8000000000000000"))
+(def: i64//+iteration (_.manual "+0x10000000000000000"))
+(def: i64//-iteration (_.manual "-0x10000000000000000"))
+(def: i64//+cap (_.manual "+0x8000000000000000"))
+(def: i64//-cap (_.manual "-0x8000000000000001"))
 
 (runtime: (i64//64 input)
   (with_vars [temp]
@@ -355,9 +336,9 @@
   (_.return (_.- (|>  subject (..i64//division param) (_.* param))
                  subject)))
 
-(template [<runtime> <python>]
+(template [<runtime> <host>]
   [(runtime: (<runtime> left right)
-     (_.return (..i64//64 (<python> (..as_nat left) (..as_nat right)))))]
+     (_.return (..i64//64 (<host> (..as_nat left) (..as_nat right)))))]
 
   [i64//and _.bit_and]
   [i64//or _.bit_or]
@@ -378,12 +359,6 @@
 (def: runtime//i64
   (Statement Any)
   ($_ _.then
-      @i64//+limit
-      @i64//-limit
-      @i64//+iteration
-      @i64//-iteration
-      @i64//+cap
-      @i64//-cap
       @i64//64
       @i64//nat_top
       @i64//left_shift
diff --git a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby.lux b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby.lux
index 9524441f2..f1a4e3c1c 100644
--- a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby.lux
+++ b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby.lux
@@ -26,7 +26,41 @@
        [reference (#+)
         [variable (#+)]]]]]]])
 
-(def: #export (generate archive synthesis)
+(def: (statement expression archive synthesis)
+  Phase!
+  (case synthesis
+    (^template [<tag>]
+      [(^ (<tag> value))
+       (//////phase\map _.return (expression archive synthesis))])
+    ([////synthesis.bit]
+     [////synthesis.i64]
+     [////synthesis.f64]
+     [////synthesis.text]
+     [////synthesis.variant]
+     [////synthesis.tuple]
+     [#////synthesis.Reference]
+     [////synthesis.branch/get]
+     [////synthesis.function/apply]
+     [#////synthesis.Extension])
+
+    (^ (////synthesis.branch/case case))
+    (/case.case! false statement expression archive case)
+
+    (^template [<tag> <generator>]
+      [(^ (<tag> value))
+       (<generator> statement expression archive value)])
+    ([////synthesis.branch/let /case.let!]
+     [////synthesis.branch/if /case.if!]
+     [////synthesis.loop/scope /loop.scope!]
+     [////synthesis.loop/recur /loop.recur!])
+
+    (^ (////synthesis.function/abstraction abstraction))
+    (//////phase\map _.return (/function.function statement expression archive abstraction))
+    ))
+
+(exception: #export cannot-recur-as-an-expression)
+
+(def: (expression archive synthesis)
   Phase
   (case synthesis
     (^template [<tag> <generator>]
@@ -39,23 +73,32 @@
 
     (^template [<tag> <generator>]
       [(^ (<tag> value))
-       (<generator> generate archive value)])
+       (<generator> expression archive value)])
     ([////synthesis.variant /structure.variant]
      [////synthesis.tuple /structure.tuple]
      
-     [////synthesis.branch/case /case.case]
      [////synthesis.branch/let /case.let]
      [////synthesis.branch/if /case.if]
      [////synthesis.branch/get /case.get]
      
-     [////synthesis.loop/scope /loop.scope]
-     [////synthesis.loop/recur /loop.recur]
-     
-     [////synthesis.function/abstraction /function.function]
      [////synthesis.function/apply /function.apply])
 
+    (^template [<tag> <generator>]
+      [(^ (<tag> value))
+       (<generator> statement expression archive value)])
+    ([////synthesis.branch/case /case.case]
+     [////synthesis.loop/scope /loop.scope]
+     [////synthesis.function/abstraction /function.function])
+
+    (^ (////synthesis.loop/recur _))
+    (//////phase.throw ..cannot-recur-as-an-expression [])
+
     (#////synthesis.Reference value)
     (//reference.reference /reference.system archive value)
 
     (#////synthesis.Extension extension)
-    (///extension.apply archive generate extension)))
+    (///extension.apply archive expression extension)))
+
+(def: #export generate
+  Phase
+  ..expression)
diff --git a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/case.lux b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/case.lux
index 428ac6279..e21957afe 100644
--- a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/case.lux
+++ b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/case.lux
@@ -35,6 +35,10 @@
        [meta
         [archive (#+ Archive)]]]]]]])
 
+(def: #export (gensym prefix)
+  (-> Text (Operation LVar))
+  (///////phase\map (|>> %.nat (format prefix) _.local) /////generation.next))
+
 (def: #export register
   (-> Register LVar)
   (|>> (///reference.local //reference.system) :assume))
@@ -54,6 +58,15 @@
               (_.lambda #.None (list (..register register)))
               (_.apply_lambda/* (list valueO))))))
 
+(def: #export (let! statement expression archive [valueS register bodyS])
+  (Generator! [Synthesis Register Synthesis])
+  (do ///////phase.monad
+    [valueO (expression archive valueS)
+     bodyO (statement expression archive bodyS)]
+    (wrap ($_ _.then
+              (_.set (list (..register register)) valueO)
+              bodyO))))
+
 (def: #export (if expression archive [testS thenS elseS])
   (Generator [Synthesis Synthesis Synthesis])
   (do ///////phase.monad
@@ -62,6 +75,16 @@
      elseO (expression archive elseS)]
     (wrap (_.? testO thenO elseO))))
 
+(def: #export (if! statement expression archive [testS thenS elseS])
+  (Generator! [Synthesis Synthesis Synthesis])
+  (do ///////phase.monad
+    [test! (expression archive testS)
+     then! (statement expression archive thenS)
+     else! (statement expression archive elseS)]
+    (wrap (_.if test!
+            then!
+            else!))))
+
 (def: #export (get expression archive [pathP valueS])
   (Generator [(List Member) Synthesis])
   (do ///////phase.monad
@@ -106,7 +129,13 @@
   Statement
   (_.set (list @cursor) (|> @savepoint (_.do "pop" (list)))))
 
-(def: fail! _.break)
+(def: #export symbol
+  (_.symbol "lux_break"))
+
+(def: fail!
+  _.break
+  ## (_.throw/1 ..symbol)
+  )
 
 (def: (multi_pop! pops)
   (-> Nat Statement)
@@ -130,23 +159,44 @@
   [right_choice (_.string "") inc]
   )
 
-(def: (alternation pre! post!)
-  (-> Statement Statement Statement)
+(def: (with_looping in_closure? g!once g!continue? body!)
+  (-> Bit LVar LVar Statement Statement)
+  ## (_.catch ..symbol body!)
+  (.if in_closure?
+    ($_ _.then
+        (_.while (_.bool true)
+                 body!))
+    ($_ _.then
+        (_.set (list g!once) (_.bool true))
+        (_.set (list g!continue?) (_.bool false))
+        (<| (_.while (_.bool true))
+            (_.if g!once
+              ($_ _.then
+                  (_.set (list g!once) (_.bool false))
+                  body!)
+              ($_ _.then
+                  (_.set (list g!continue?) (_.bool true))
+                  _.break)))
+        (_.when g!continue?
+                _.next)))
+  )
+
+(def: (alternation in_closure? g!once g!continue? pre! post!)
+  (-> Bit LVar LVar Statement Statement Statement)
   ($_ _.then
-      (_.while (_.bool true)
-               ($_ _.then
-                   ..save!
-                   pre!))
-      ($_ _.then
-          ..restore!
-          post!)))
-
-(def: (pattern_matching' expression archive)
-  (-> Phase Archive Path (Operation Statement))
+      (with_looping in_closure? g!once g!continue?
+        ($_ _.then
+            ..save!
+            pre!))
+      ..restore!
+      post!))
+
+(def: (pattern_matching' in_closure? statement expression archive)
+  (-> Bit (Generator! Path))
   (function (recur pathP)
     (.case pathP
       (#/////synthesis.Then bodyS)
-      (///////phase\map _.return (expression archive bodyS))
+      (statement expression archive bodyS)
 
       #/////synthesis.Pop
       (///////phase\wrap ..pop!)
@@ -221,58 +271,49 @@
                                  (..multi_pop! (n.+ 2 extra_pops))
                                  next!))))
 
-      (^template [<tag> <combinator>]
-        [(^ (<tag> preP postP))
-         (do ///////phase.monad
-           [pre! (recur preP)
-            post! (recur postP)]
-           (wrap (<combinator> pre! post!)))])
-      ([/////synthesis.path/seq _.then]
-       [/////synthesis.path/alt ..alternation]))))
-
-(def: (pattern_matching expression archive pathP)
-  (-> Phase Archive Path (Operation Statement))
+      (^ (/////synthesis.path/seq preP postP))
+      (do ///////phase.monad
+        [pre! (recur preP)
+         post! (recur postP)]
+        (wrap ($_ _.then
+                  pre!
+                  post!)))
+
+      (^ (/////synthesis.path/alt preP postP))
+      (do ///////phase.monad
+        [pre! (recur preP)
+         post! (recur postP)
+         g!once (..gensym "once")
+         g!continue? (..gensym "continue")]
+        (wrap (..alternation in_closure? g!once g!continue? pre! post!)))
+      )))
+
+(def: (pattern_matching in_closure? statement expression archive pathP)
+  (-> Bit (Generator! Path))
   (do ///////phase.monad
-    [pattern_matching! (pattern_matching' expression archive pathP)]
+    [pattern_matching! (pattern_matching' in_closure? statement expression archive pathP)
+     g!once (..gensym "once")
+     g!continue? (..gensym "continue")]
     (wrap ($_ _.then
-              (_.while (_.bool true)
-                       pattern_matching!)
+              (..with_looping in_closure? g!once g!continue?
+                pattern_matching!)
               (_.statement (_.raise (_.string case.pattern_matching_error)))))))
 
-(def: #export dependencies
-  (-> Path (List LVar))
-  (|>> case.storage
-       (get@ #case.dependencies)
-       set.to_list
-       (list\map (function (_ variable)
-                   (.case variable
-                     (#///////variable.Local register)
-                     (..register register)
-                     
-                     (#///////variable.Foreign register)
-                     (..capture register))))))
-
-(def: #export (case expression archive [valueS pathP])
-  (Generator [Synthesis Path])
+(def: #export (case! in_closure? statement expression archive [valueS pathP])
+  (-> Bit (Generator! [Synthesis Path]))
   (do ///////phase.monad
-    [initG (expression archive valueS)
-     [[case_module case_artifact] pattern_matching!] (/////generation.with_new_context archive
-                                                       (pattern_matching expression archive pathP))
-     #let [## @case (_.local (///reference.artifact [case_module case_artifact]))
-           ## @dependencies+ (..dependencies (/////synthesis.path/seq (/////synthesis.path/then valueS)
-           ##                                                         pathP))
-           ## directive (_.function @case @dependencies+
-           ##             ($_ _.then
-           ##                 (_.set (list @cursor) (_.array (list initG)))
-           ##                 (_.set (list @savepoint) (_.array (list)))
-           ##                 pattern_matching!))
-           directive (_.lambda #.None (list)
-                               ($_ _.then
-                                   (_.set (list @cursor) (_.array (list initG)))
-                                   (_.set (list @savepoint) (_.array (list)))
-                                   pattern_matching!))]
-     ## _ (/////generation.execute! directive)
-     ## _ (/////generation.save! (%.nat case_artifact) directive)
-     ]
-    ## (wrap (_.apply/* @dependencies+ @case))
-    (wrap (_.apply_lambda/* (list) directive))))
+    [stack_init (expression archive valueS)
+     pattern_matching! (pattern_matching in_closure? statement expression archive pathP)]
+    (wrap ($_ _.then
+              (_.set (list @cursor) (_.array (list stack_init)))
+              (_.set (list @savepoint) (_.array (list)))
+              pattern_matching!
+              ))))
+
+(def: #export (case statement expression archive case)
+  (-> Phase! (Generator [Synthesis Path]))
+  (|> case
+      (case! true statement expression archive)
+      (\ ///////phase.monad map
+         (|>> (_.lambda #.None (list))
+              (_.apply_lambda/* (list))))))
diff --git a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/function.lux b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/function.lux
index e2ace391d..21d74f8cd 100644
--- a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/function.lux
+++ b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/function.lux
@@ -62,15 +62,12 @@
 (def: input
   (|>> inc //case.register))
 
-(def: #export (function expression archive [environment arity bodyS])
-  (Generator (Abstraction Synthesis))
+(def: #export (function statement expression archive [environment arity bodyS])
+  (-> Phase! (Generator (Abstraction Synthesis)))
   (do {! ///////phase.monad}
-    [[[function_module function_artifact] bodyO] (/////generation.with_new_context archive
-                                                   (do !
-                                                     [function_name (\ ! map ///reference.artifact
-                                                                       (/////generation.context archive))]
-                                                     (/////generation.with_anchor (_.local function_name)
-                                                       (expression archive bodyS))))
+    [[[function_module function_artifact] body!] (/////generation.with_new_context archive
+                                                   (/////generation.with_anchor 1
+                                                     (statement expression archive bodyS)))
      closureO+ (monad.map ! (expression archive) environment)
      #let [function_name (///reference.artifact [function_module function_artifact])
            @curried (_.local "curried")
@@ -90,9 +87,9 @@
                                                   ($_ _.then
                                                       (_.set (list @num_args) (_.the "length" @curried))
                                                       (_.cond (list [(|> @num_args (_.= arityO))
-                                                                     ($_ _.then
-                                                                         initialize!
-                                                                         (_.return bodyO))]
+                                                                     (<| (_.then initialize!)
+                                                                         //loop.with_scope
+                                                                         body!)]
                                                                     [(|> @num_args (_.> arityO))
                                                                      (let [slice (.function (_ from to)
                                                                                    (_.array_range from to @curried))
diff --git a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/loop.lux b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/loop.lux
index 4bdf1bc55..a2df0884a 100644
--- a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/loop.lux
+++ b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/loop.lux
@@ -4,7 +4,7 @@
     ["." monad (#+ do)]]
    [data
     ["." product]
-    [text
+    ["." text
      ["%" format (#+ format)]]
     [collection
      ["." list ("#\." functor fold)]
@@ -30,59 +30,66 @@
        [reference
         ["#." variable (#+ Register)]]]]]]])
 
-(def: loop_name
-  (-> Nat LVar)
-  (|>> %.nat (format "loop") _.local))
+(def: (setup offset bindings body)
+  (-> Register (List Expression) Statement Statement)
+  (|> bindings
+      list.enumeration
+      (list\map (function (_ [register value])
+                  (_.set (list (//case.register (n.+ offset register)))
+                         value)))
+      list.reverse
+      (list\fold _.then body)))
 
-(def: #export (scope expression archive [start initsS+ bodyS])
-  (Generator (Scope Synthesis))
+(def: symbol
+  (_.symbol "lux_continue"))
+
+(def: #export with_scope
+  (-> Statement Statement)
+  (_.while (_.bool true)))
+
+(def: #export (scope! statement expression archive [start initsS+ bodyS])
+  (Generator! (Scope Synthesis))
   (case initsS+
     ## function/false/non-independent loop
     #.Nil
-    (expression archive bodyS)
+    (statement expression archive bodyS)
 
     ## true loop
     _
     (do {! ///////phase.monad}
-      [@loop (\ ! map ..loop_name /////generation.next)
-       initsO+ (monad.map ! (expression archive) initsS+)
-       [[loop_module loop_artifact] bodyO] (/////generation.with_new_context archive
-                                             (do !
-                                               [@loop (\ ! map (|>> ///reference.artifact _.local)
-                                                         (/////generation.context archive))]
-                                               (/////generation.with_anchor @loop
-                                                 (expression archive bodyS))))
-       #let [@loop (|> [loop_module loop_artifact] ///reference.artifact _.local)
-             locals (|> initsS+
-                        list.enumeration
-                        (list\map (|>> product.left (n.+ start) //case.register)))
-             actual_loop (_.statement
-                          (_.lambda (#.Some @loop) locals
-                                    (_.return bodyO)))
-             [directive instantiation] (: [Statement Expression]
-                                          (case (|> (synthesis.path/then bodyS)
-                                                    //case.dependencies
-                                                    (set.from_list _.code_hash)
-                                                    (set.difference (set.from_list _.code_hash locals))
-                                                    set.to_list)
-                                            #.Nil
-                                            [actual_loop
-                                             @loop]
+      [initsO+ (monad.map ! (expression archive) initsS+)
+       body! (/////generation.with_anchor start
+               (statement expression archive bodyS))]
+      (wrap (<| (..setup start initsO+)
+                ..with_scope
+                body!)))))
 
-                                            foreigns
-                                            [(_.statement
-                                              (_.lambda (#.Some @loop) foreigns
-                                                        ($_ _.then
-                                                            actual_loop
-                                                            (_.return @loop))))
-                                             (_.apply_lambda/* foreigns @loop)]))]
-       _ (/////generation.execute! directive)
-       _ (/////generation.save! (%.nat loop_artifact) directive)]
-      (wrap (_.apply_lambda/* initsO+ instantiation)))))
+(def: #export (scope statement expression archive [start initsS+ bodyS])
+  (-> Phase! (Generator (Scope Synthesis)))
+  (case initsS+
+    ## function/false/non-independent loop
+    #.Nil
+    (expression archive bodyS)
+
+    ## true loop
+    _
+    (do {! ///////phase.monad}
+      [body! (scope! statement expression archive [start initsS+ bodyS])]
+      (wrap (|> body!
+                (_.lambda #.None (list))
+                (_.apply_lambda/* (list)))))))
 
-(def: #export (recur expression archive argsS+)
-  (Generator (List Synthesis))
+(def: #export (recur! statement expression archive argsS+)
+  (Generator! (List Synthesis))
   (do {! ///////phase.monad}
-    [@scope /////generation.anchor
-     argsO+ (monad.map ! (expression archive) argsS+)]
-    (wrap (_.apply_lambda/* argsO+ @scope))))
+    [offset /////generation.anchor
+     @temp (//case.gensym "lux_recur_values")
+     argsO+ (monad.map ! (expression archive) argsS+)
+     #let [re_binds (|> argsO+
+                        list.enumeration
+                        (list\map (function (_ [idx _])
+                                    (_.nth (_.int (.int idx)) @temp))))]]
+    (wrap ($_ _.then
+              (_.set (list @temp) (_.array argsO+))
+              (..setup offset re_binds
+                       _.next)))))
diff --git a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/runtime.lux b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/runtime.lux
index d74915164..01befb892 100644
--- a/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/runtime.lux
+++ b/stdlib/source/lux/tool/compiler/language/lux/phase/generation/ruby/runtime.lux
@@ -39,7 +39,7 @@
 
 (template [<name> <base>]
   [(type: #export <name>
-     (<base> LVar Expression Statement))]
+     (<base> Register Expression Statement))]
 
   [Operation /////generation.Operation]
   [Phase /////generation.Phase]
@@ -51,12 +51,10 @@
   (-> Phase Archive i (Operation Expression)))
 
 (type: #export Phase!
-  (-> Phase Archive Synthesis (Operation (Statement Any))))
+  (-> Phase Archive Synthesis (Operation Statement)))
 
 (type: #export (Generator! i)
-  (-> Phase! Phase Archive i (Operation (Statement Any))))
-
-(def: prefix Text "LuxRuntime")
+  (-> Phase! Phase Archive i (Operation Statement)))
 
 (def: #export unit
   (_.string /////synthesis.unit))
@@ -196,8 +194,8 @@
         test_recursion! (_.if is_last?
                           ## Must recurse.
                           ($_ _.then
-                              (_.set (list sum) sum_value)
-                              (_.set (list wantedTag) (_.- sum_tag wantedTag)))
+                              (_.set (list wantedTag) (_.- sum_tag wantedTag))
+                              (_.set (list sum) sum_value))
                           no_match!)]
     (<| (_.while (_.bool true))
         (_.cond (list [(_.= sum_tag wantedTag)
@@ -245,18 +243,76 @@
       @lux//program_args
       ))
 
-(runtime: (i64//logic_right_shift param subject)
-  (let [mask (|> (_.int +1)
-                 (_.bit_shl (_.- param (_.int +64)))
-                 (_.- (_.int +1)))]
+(def: i64//+limit (_.manual "+0x7FFFFFFFFFFFFFFF"))
+(def: i64//-limit (_.manual "-0x8000000000000000"))
+(def: i64//+iteration (_.manual "+0x10000000000000000"))
+(def: i64//-iteration (_.manual "-0x10000000000000000"))
+(def: i64//+cap (_.manual "+0x8000000000000000"))
+(def: i64//-cap (_.manual "-0x8000000000000001"))
+
+(runtime: (i64//64 input)
+  (with_vars [temp]
+    (`` (<| (~~ (template [<scenario> <iteration> <cap> <entrance>]
+                  [(_.if (|> input <scenario>)
+                     ($_ _.then
+                         (_.set (list temp) (_.% <iteration> input))
+                         (_.return (_.? (|> temp <scenario>)
+                                        (|> temp (_.- <cap>) (_.+ <entrance>))
+                                        temp))))]
+
+                  [(_.> ..i64//+limit) ..i64//+iteration ..i64//+cap ..i64//-limit]
+                  [(_.< ..i64//-limit) ..i64//-iteration ..i64//-cap ..i64//+limit]
+                  ))
+            (_.return input)))))
+
+(runtime: i64//nat_top
+  (|> (_.int +1)
+      (_.bit_shl (_.int +64))
+      (_.- (_.int +1))))
+
+(def: as_nat
+  (_.% (_.manual "0x10000000000000000")))
+
+(runtime: (i64//left_shift param subject)
+  (_.return (|> subject
+                (_.bit_shl (_.% (_.int +64) param))
+                ..i64//64)))
+
+(runtime: (i64//right_shift param subject)
+  ($_ _.then
+      (_.set (list param) (_.% (_.int +64) param))
+      (_.return (_.? (_.= (_.int +0) param)
+                     subject
+                     (|> subject
+                         ..as_nat
+                         (_.bit_shr param))))))
+
+(template [<runtime> <host>]
+  [(runtime: (<runtime> left right)
+     (_.return (..i64//64 (<host> (..as_nat left) (..as_nat right)))))]
+
+  [i64//and _.bit_and]
+  [i64//or _.bit_or]
+  [i64//xor _.bit_xor]
+  )
+
+(runtime: (i64//division parameter subject)
+  (let [extra (_.do "remainder" (list parameter) subject)]
     (_.return (|> subject
-                  (_.bit_shr param)
-                  (_.bit_and mask)))))
+                  (_.- extra)
+                  (_./ parameter)))))
 
 (def: runtime//i64
   Statement
   ($_ _.then
-      @i64//logic_right_shift
+      @i64//64
+      @i64//nat_top
+      @i64//left_shift
+      @i64//right_shift
+      @i64//and
+      @i64//or
+      @i64//xor
+      @i64//division
       ))
 
 (runtime: (f64//decode inputG)
@@ -291,13 +347,15 @@
   (_.and (|> value (_.>= (_.int +0)))
          (|> value (_.< top))))
 
-(runtime: (text//clip @text @from @to)
-  (_.return (|> @text (_.array_range @from @to))))
+(runtime: (text//clip offset length text)
+  (_.if (_.= (_.int +0) length)
+    (_.return (_.string ""))
+    (_.return (_.array_range offset (_.+ offset (_.- (_.int +1) length)) text))))
 
 (runtime: (text//char idx text)
   (_.if (|> idx (within? (_.the "length" text)))
-    (_.return (..some (|> text (_.array_range idx idx) (_.do "ord" (list)))))
-    (_.return ..none)))
+    (_.return (|> text (_.array_range idx idx) (_.do "ord" (list))))
+    (_.statement (_.raise (_.string "[Lux Error] Cannot get char from text.")))))
 
 (def: runtime//text
   Statement
@@ -307,6 +365,17 @@
       @text//char
       ))
 
+(runtime: (array//write idx value array)
+  ($_ _.then
+      (_.set (list (_.nth idx array)) value)
+      (_.return array)))
+
+(def: runtime//array
+  Statement
+  ($_ _.then
+      @array//write
+      ))
+
 (def: runtime
   Statement
   ($_ _.then
@@ -315,11 +384,9 @@
       runtime//i64
       runtime//f64
       runtime//text
+      runtime//array
       ))
 
-(def: #export artifact
-  ..prefix)
-
 (def: #export generate
   (Operation [Registry Output])
   (do ///////phase.monad
diff --git a/stdlib/source/lux/world/file.lux b/stdlib/source/lux/world/file.lux
index 972019c39..0d6958d23 100644
--- a/stdlib/source/lux/world/file.lux
+++ b/stdlib/source/lux/world/file.lux
@@ -1139,6 +1139,217 @@
                        ..default_separator)
                      ))
                )
+
+        @.ruby
+        (as_is (host.import: Time #as RubyTime
+                 (#static at [Frac] RubyTime)
+                 
+                 (to_f [] Frac))
+
+               (host.import: Stat #as RubyStat
+                 (executable? [] Bit)
+                 (size Int)
+                 (mtime [] RubyTime))
+
+               (host.import: File #as RubyFile
+                 (#static SEPARATOR host.String)
+                 (#static open [Path host.String] #io #try RubyFile)
+                 (#static stat [Path] #io #try RubyStat)
+                 (#static delete [Path] #io #try Int)
+                 (#static file? [Path] #io #try Bit)
+                 (#static directory? [Path] #io #try Bit)
+                 (#static utime [RubyTime RubyTime Path] #io #try Int)
+
+                 (read [] #io #try Binary)
+                 (write [Binary] #io #try Int)
+                 (flush [] #io #try #? Any)
+                 (close [] #io #try #? Any))
+
+               (host.import: Dir #as RubyDir
+                 (#static open [Path] #io #try RubyDir)
+                 
+                 (children [] #io #try (Array Path))
+                 (close [] #io #try #? Any))
+
+               (host.import: "fileutils" FileUtils #as RubyFileUtils
+                 (#static touch [Path] #io #try #? Any)
+                 (#static move [Path Path] #io #try #? Any)
+                 (#static rmdir [Path] #io #try #? Any)
+                 (#static mkdir [Path] #io #try #? Any))
+
+               (def: default_separator
+                 Text
+                 (..RubyFile::SEPARATOR))
+
+               (`` (structure: (file path)
+                     (-> Path (File IO))
+
+                     (~~ (template [<name> <mode>]
+                           [(def: <name>
+                              (..can_modify
+                               (function (<name> data)
+                                 (do {! (try.with io.monad)}
+                                   [file (RubyFile::open [path <mode>])
+                                    data (RubyFile::write [data] file)
+                                    _ (RubyFile::flush [] file)
+                                    _ (RubyFile::close [] file)]
+                                   (wrap [])))))]
+                           
+                           [over_write  "wb"]
+                           [append      "ab"]
+                           ))
+
+                     (def: content
+                       (..can_query
+                        (function (_ _)
+                          (do {! (try.with io.monad)}
+                            [file (RubyFile::open [path "rb"])
+                             data (RubyFile::read [] file)
+                             _ (RubyFile::close [] file)]
+                            (wrap data)))))
+
+                     (def: name
+                       (..can_see
+                        (function (_ _)
+                          (|> path
+                              (text.split_all_with ..default_separator)
+                              list.reverse
+                              list.head
+                              (maybe.default path)))))
+
+                     (def: path
+                       (..can_see
+                        (function (_ _)
+                          path)))
+
+                     (~~ (template [<capability> <name> <pipeline>]
+                           [(def: <name>
+                              (<capability>
+                               (function (_ _)
+                                 (do {! (try.with io.monad)}
+                                   [stat (: (IO (Try RubyStat))
+                                            (RubyFile::stat [path]))]
+                                   (wrap (`` (|> stat (: RubyStat) (~~ (template.splice <pipeline>)))))))))]
+
+                           [..can_query size [RubyStat::size .nat]]
+                           [..can_query last_modified [(RubyStat::mtime [])
+                                                       (RubyTime::to_f [])
+                                                       (f.* +1,000.0)
+                                                       f.int
+                                                       duration.from_millis
+                                                       instant.absolute]]
+                           [..can_query can_execute? [(RubyStat::executable? [])]]
+                           ))
+
+                     (def: modify
+                       (..can_modify
+                        (function (_ moment)
+                          (let [moment (|> moment
+                                           instant.relative
+                                           duration.to_millis
+                                           i.frac
+                                           (f./ +1,000.0)
+                                           RubyTime::at)]
+                            (do {! (try.with io.monad)}
+                              [_ (RubyFile::utime [moment moment path])]
+                              (wrap []))))))
+
+                     (def: move
+                       (..can_open
+                        (function (_ destination)
+                          (do {! (try.with io.monad)}
+                            [_ (RubyFileUtils::move [path destination])]
+                            (wrap (file destination))))))
+
+                     (def: delete
+                       (..can_delete
+                        (function (_ _)
+                          (do {! (try.with io.monad)}
+                            [_ (RubyFile::delete [path])]
+                            (wrap [])))))
+                     ))
+
+               (`` (structure: (directory path)
+                     (-> Path (Directory IO))
+
+                     (def: scope
+                       (..can_see
+                        (function (_ _)
+                          path)))
+
+                     (~~ (template [<name> <test> <constructor> <capability>]
+                           [(def: <name>
+                              (..can_query
+                               (function (_ _)
+                                 (do {! (try.with io.monad)}
+                                   [self (RubyDir::open [path])
+                                    children (RubyDir::children [] self)
+                                    output (loop [input (|> children
+                                                            array.to_list
+                                                            (list\map (|>> (format path ..default_separator))))
+                                                  output (: (List (<capability> IO))
+                                                            (list))]
+                                             (case input
+                                               #.Nil
+                                               (wrap output)
+
+                                               (#.Cons head tail)
+                                               (do !
+                                                 [verdict (<test> head)]
+                                                 (if verdict
+                                                   (recur tail (#.Cons (<constructor> head) output))
+                                                   (recur tail output)))))
+                                    _ (RubyDir::close [] self)]
+                                   (wrap output)))))]
+
+                           [files RubyFile::file? ..file File]
+                           [directories RubyFile::directory? directory Directory]
+                           ))
+
+                     (def: discard
+                       (..can_delete
+                        (function (discard _)
+                          (do {! (try.with io.monad)}
+                            [_ (RubyFileUtils::rmdir [path])]
+                            (wrap [])))))
+                     ))
+
+               (`` (structure: #export default
+                     (System IO)
+
+                     (~~ (template [<name> <test> <constructor> <exception>]
+                           [(def: <name>
+                              (..can_open
+                               (function (_ path)
+                                 (do {! (try.with io.monad)}
+                                   [verdict (<test> path)]
+                                   (\ io.monad wrap
+                                      (if verdict
+                                        (#try.Success (<constructor> path))
+                                        (exception.throw <exception> [path])))))))]
+
+                           [file RubyFile::file? ..file ..cannot_find_file]
+                           [directory RubyFile::directory? ..directory ..cannot_find_directory]
+                           ))
+                     
+                     (def: create_file
+                       (..can_open
+                        (function (_ path)
+                          (do {! (try.with io.monad)}
+                            [_ (RubyFileUtils::touch [path])]
+                            (wrap (..file path))))))
+
+                     (def: create_directory
+                       (..can_open
+                        (function (create_directory path)
+                          (do {! (try.with io.monad)}
+                            [_ (RubyFileUtils::mkdir path)]
+                            (wrap (..directory path))))))
+
+                     (def: separator
+                       ..default_separator)
+                     ))
+               )
         }))
 
 (template [<get> <signature> <create> <find> <exception>]
diff --git a/stdlib/source/lux/world/program.lux b/stdlib/source/lux/world/program.lux
index 7a3d125a0..acaf36711 100644
--- a/stdlib/source/lux/world/program.lux
+++ b/stdlib/source/lux/world/program.lux
@@ -19,7 +19,8 @@
      ["%" format (#+ format)]]
     [collection
      ["." array (#+ Array) ("#\." fold)]
-     ["." dictionary (#+ Dictionary)]]]
+     ["." dictionary (#+ Dictionary)]
+     ["." list ("#\." functor)]]]
    [math
     [number
      ["i" int]]]]
@@ -203,7 +204,19 @@
                              (wrap default))
                            
                            (#try.Failure _)
-                           (wrap default)))))}
+                           (wrap default)))))
+        @.ruby (as_is (host.import: Env #as RubyEnv
+                        (#static keys [] (Array Text))
+                        (#static fetch [Text] Text))
+
+                      (host.import: "fileutils" FileUtils #as RubyFileUtils
+                        (#static pwd [] #io Path))
+                      
+                      (host.import: Dir #as RubyDir
+                        (#static home [] #io Path))
+
+                      (host.import: Kernel #as RubyKernel
+                        (#static exit [Int] #io Nothing)))}
        (as_is)))
 
 (structure: #export default
@@ -235,7 +248,13 @@
                                          [value (os/environ::get [variable])]
                                          (wrap (dictionary.put variable value environment))))
                                    environment.empty
-                                   (array.to_list keys)))}
+                                   (array.to_list keys)))
+            @.ruby (|> (RubyEnv::keys [])
+                       array.to_list
+                       (list\map (function (_ variable)
+                                   [variable (RubyEnv::fetch [variable])]))
+                       (dictionary.from_list text.hash)
+                       io.io)}
            ## TODO: Replace dummy implementation.
            (io.io environment.empty))))
   
@@ -250,7 +269,8 @@
                        (NodeJs_OS::homedir []))
                    <default>)
             @.python (os/path::expanduser ["~"])
-            @.lua (..run_command "~" "echo ~")}
+            @.lua (..run_command "~" "echo ~")
+            @.ruby (RubyDir::home [])}
            ## TODO: Replace dummy implementation.
            <default>)))
 
@@ -273,7 +293,8 @@
                      on_windows (..run_command default "cd")]
                     (if (is? default on_windows)
                       (..run_command default "pwd")
-                      (wrap on_windows)))}
+                      (wrap on_windows)))
+            @.ruby (RubyFileUtils::pwd [])}
            ## TODO: Replace dummy implementation.
            (io.io <default>))))
   
@@ -292,4 +313,5 @@
                        ## else
                        (..default_exit! code))
             @.python (os::_exit [code])
-            @.lua (os/exit [code])}))))
+            @.lua (os/exit [code])
+            @.ruby (RubyKernel::exit [code])}))))
diff --git a/stdlib/source/test/lux.lux b/stdlib/source/test/lux.lux
index 0379b8427..ef6177deb 100644
--- a/stdlib/source/test/lux.lux
+++ b/stdlib/source/test/lux.lux
@@ -183,7 +183,8 @@
                            @.jvm on_valid_host
                            @.js on_valid_host
                            @.python on_valid_host
-                           @.lua on_valid_host}
+                           @.lua on_valid_host
+                           @.ruby on_valid_host}
                           on_default))))))
 
 (def: conversion_tests
diff --git a/stdlib/source/test/lux/extension.lux b/stdlib/source/test/lux/extension.lux
index 67abd0eca..450570c20 100644
--- a/stdlib/source/test/lux/extension.lux
+++ b/stdlib/source/test/lux/extension.lux
@@ -5,7 +5,8 @@
     ["." jvm]
     ["." js]
     ["." python]
-    ["." lua]]
+    ["." lua]
+    ["." ruby]]
    [abstract
     [monad (#+ do)]]
    [control
@@ -65,7 +66,8 @@
 
                      @.js (js.string self)
                      @.python (python.unicode self)
-                     @.lua (lua.string self)})))))
+                     @.lua (lua.string self)
+                     @.ruby (ruby.string self)})))))
 
 (for {@.old
       (as_is)}
diff --git a/stdlib/source/test/lux/host.rb.lux b/stdlib/source/test/lux/host.rb.lux
new file mode 100644
index 000000000..0b6cac81b
--- /dev/null
+++ b/stdlib/source/test/lux/host.rb.lux
@@ -0,0 +1,24 @@
+(.module:
+  [lux #*
+   ["_" test (#+ Test)]
+   [abstract
+    [monad (#+ do)]]
+   [control
+    ["." try]]
+   [data
+    ["." text ("#\." equivalence)]]
+   [math
+    ["." random (#+ Random)]
+    [number
+     ["." nat]
+     ["." frac]]]]
+  {1
+   ["." /]})
+
+(def: #export test
+  Test
+  (do {! random.monad}
+    []
+    (<| (_.covering /._)
+        (_.test "TBD"
+                true))))