Re-enable overloading for callable C++ classes.

Cython/Compiler/ExprNodes.py

@@ -4678,8 +4678,6 @@ class SimpleCallNode(CallNode):
                 self.type = PyrexTypes.error_type
                 self.result_code = "<error>"
                 return
-            self.function.type = overloaded_entry.type
-            overloaded_entry = None
         elif hasattr(self.function, 'entry'):
             overloaded_entry = self.function.entry
         elif (isinstance(self.function, IndexNode) and
@@ -4703,13 +4701,14 @@ class SimpleCallNode(CallNode):
                 return
 
             entry.used = True
-            self.function.entry = entry
+            if not func_type.is_cpp_class:
+                self.function.entry = entry
             self.function.type = entry.type
             func_type = self.function_type()
         else:
             entry = None
             func_type = self.function_type()
-            if not (func_type.is_cfunction or func_type.is_cpp_class):
+            if not func_type.is_cfunction:
                 error(self.pos, "Calling non-function type '%s'" % func_type)
                 self.type = PyrexTypes.error_type
                 self.result_code = "<error>"