Fixed trac-17, default values as class members.

Cython/Compiler/Main.py

@@ -328,7 +328,7 @@ class Context:
             errors_occurred = True
         if errors_occurred and result.c_file:
             try:
-                Utils.castrate_file(result.c_file, os.stat(source))
+                Utils.castrate_file(result.c_file, os.stat(source.filename))
             except EnvironmentError:
                 pass
             result.c_file = None

Cython/Compiler/Nodes.py

@@ -790,7 +790,7 @@ class FuncDefNode(StatNode, BlockNode):
             if arg.default:
                 if arg.is_generic:
                     if not hasattr(arg, 'default_entry'):
-                        arg.default.analyse_types(genv)
+                        arg.default.analyse_types(env)
                         arg.default = arg.default.coerce_to(arg.type, genv)
                         if arg.default.is_literal:
                             arg.default_entry = arg.default