fixed net compilation API

@@ -47,7 +47,9 @@ def build (lang, tree, saveto) :
             os.unlink(tmp.name)
     else :
         mod = lang.build(tree, out.name, os.path.basename(out.name))
-    mod.ast = tree
+    if mod is not None :
+        mod.__ast__ = tree
+    return mod
 
 class BaseDeclare (object) :
     _levels = [None]

@@ -13,10 +13,6 @@ class Declare (BaseDeclare) :
     _levels = ["import", "decl"]
     _default = "decl"
 
-class GoModule (object) :
-    def __init__ (self, srcpath) :
-        self.path = os.path.splitext(srcpath)[0]
-
 def update_gopath () :
     # TODO: fix this wrt installation path
     path = os.path.join(os.path.dirname(os.path.dirname(inspect.getfile(snakes))),
@@ -40,4 +36,3 @@ def build (ast, src, name) :
             except ValueError :
                 continue
         raise CompilationError(ast, name, out)
-    return GoModule(src)

-import types, traceback, sys, importlib
+import types, traceback, sys
 from snakes.compil import CompilationError, BaseDeclare
 
 from . import codegen as codegen
@@ -15,11 +15,9 @@ class Declare (BaseDeclare) :
 def build (ast, src, name) :
     if isinstance(src, str) :
         src = open(src)
-    ctx = {}
     try :
-        spec = importlib.util.spec_from_file_location(module_name, file_path)
-        mod = importlib.util.module_from_spec(spec)
-        spec.loader.exec_module(mod)
+        mod = types.ModuleType(ast.name)
+        exec(src.read(), mod.__dict__)
     except Exception as err :
         c, v, t = sys.exc_info()
         msg = traceback.format_exception_only(c, v)