3 files changed, 38 insertions, 11 deletions
diff --git a/src/lux/compiler.clj b/src/lux/compiler.clj
index baf6bf549..8fe64aa59 100644
--- a/src/lux/compiler.clj
+++ b/src/lux/compiler.clj
@@ -545,11 +545,14 @@
 ;; [Resources]
 (defn compile-program [program-module]
   (init!)
-  (|case ((&/map% compile-module (&/|list "lux" program-module)) (&/init-state nil))
-    (&/$Right ?state _)
-    (do (println "Compilation complete!")
-      (&&cache/clean ?state)
-      (&packager-program/package program-module))
-
-    (&/$Left ?message)
-    (assert false ?message)))
+  (let [m-action (|do [_ &&host/compile-Function-class
+                       _ (&/map% compile-module (&/|list "lux" program-module))]
+                   (return nil))]
+    (|case (m-action (&/init-state nil))
+      (&/$Right ?state _)
+      (do (println "Compilation complete!")
+        (&&cache/clean ?state)
+        (&packager-program/package program-module))
+
+      (&/$Left ?message)
+      (assert false ?message))))
diff --git a/src/lux/compiler/base.clj b/src/lux/compiler/base.clj
index 0d9a29d79..910a9a05a 100644
--- a/src/lux/compiler/base.clj
+++ b/src/lux/compiler/base.clj
@@ -27,8 +27,8 @@
 ;; [Constants]
 (def ^String version "0.3.1")
 (def ^String input-dir "source")
-(def ^String output-dir "target/jvm/")
-(def ^String output-package (str output-dir "program.jar"))
+(def ^String output-dir "target/jvm")
+(def ^String output-package (str output-dir "/" "program.jar"))
 (def ^String function-class "lux/Function")
 
 ;; Formats
@@ -56,10 +56,17 @@
 
 (defn ^:private write-output [module name data]
   (let [module* (&host/->module-class module)
-        module-dir (str output-dir module*)]
+        module-dir (str output-dir "/" module*)]
     (.mkdirs (File. module-dir))
     (write-file (str module-dir "/" name ".class") data)))
 
+(defn class-exists? [^String module ^String class-name]
+  "(-> Text Text (IO Bool))"
+  (|do [_ (return nil)
+        :let [full-path (str output-dir "/" module "/" class-name ".class")
+              exists? (.exists (File. full-path))]]
+    (return exists?)))
+
 ;; [Exports]
 (defn ^Class load-class! [^ClassLoader loader name]
   ;; (prn 'load-class! name)
diff --git a/src/lux/compiler/host.clj b/src/lux/compiler/host.clj
index 4b76f003e..bcbed07c9 100644
--- a/src/lux/compiler/host.clj
+++ b/src/lux/compiler/host.clj
@@ -599,6 +599,23 @@
                   (.visitEnd =interface))]]
     (&&/save-class! interface-name (.toByteArray =interface))))
 
+(def compile-Function-class
+  (|do [? (&&/class-exists? "lux" "Function")]
+    (if ?
+      (return nil)
+      (&/with-scope "lux"
+        (let [object-class (&/V &/$GenericClass (&/T "java.lang.Object" (&/|list)))
+              interface-decl (&/T "Function" (&/|list))
+              ?supers (&/|list)
+              ?anns (&/|list)
+              ?methods (&/|list (&/T "apply"
+                                     (&/|list)
+                                     (&/|list)
+                                     (&/|list)
+                                     (&/|list (&/T "arg" object-class))
+                                     object-class))]
+          (compile-jvm-interface nil interface-decl ?supers ?anns ?methods))))))
+
 (defn compile-jvm-try [compile ?body ?catches ?finally]
   (|do [^MethodVisitor *writer* &/get-writer
         :let [$from (new Label)