pass AST to Compiler() constructor

jtlc

@@ -56,7 +56,7 @@ def build(args, source, dest):
     result = parser.parse(contents)
     if result is None:
         return False
-    return Compiler().compile(result, dest)
+    return Compiler(result).compile(dest)
 
 def do_compile(args, source_fname, ofname):
     Popen(['grep', '-n', '.', source_fname]).wait()