<type?> does type check for extension types

Cython/Compiler/ExprNodes.py

@@ -2617,6 +2617,9 @@ class TypecastNode(ExprNode):
                 self.operand = self.operand.coerce_to(self.type, env)
             else:
                 warning(self.pos, "No conversion from %s to %s, python object pointer used." % (self.type, self.operand.type))
+        elif from_py and to_py:
+            if self.typecheck and self.type.is_extension_type:
+                self.operand = PyTypeTestNode(self.operand, self.type, env)
     
     def check_const(self):
         self.operand.check_const()

Cython/Compiler/Parsing.py

@@ -207,12 +207,18 @@ def p_typecast(s):
     s.next()
     base_type = p_c_base_type(s)
     declarator = p_c_declarator(s, empty = 1)
+    if s.sy == '?':
+        s.next()
+        typecheck = 1
+    else:
+        typecheck = 0
     s.expect(">")
     operand = p_factor(s)
     return ExprNodes.TypecastNode(pos, 
         base_type = base_type, 
         declarator = declarator,
-        operand = operand)
+        operand = operand,
+        typecheck = typecheck)
 
 def p_sizeof(s):
     # s.sy == ident "sizeof"