disable exception check for special C return type (always assume that it's an...

disable exception check for special C return type (always assume that it's an exception when -1 is returned)

--HG--
extra : amend_source : 88f30462a27faf52fcee83af0d1dce714e4f7e69

Cython/Compiler/PyrexTypes.py

@@ -1513,7 +1513,8 @@ class CReturnCodeType(CIntType):
 
     to_py_function = "__Pyx_Owned_Py_None"
 
-    is_returncode = 1
+    is_returncode = True
+    exception_check = False
 
 
 class CBIntType(CIntType):

Cython/Compiler/TypeSlots.py

@@ -93,7 +93,7 @@ class Signature(object):
         self.fixed_arg_format = arg_format
         self.ret_format = ret_format
         self.error_value = self.error_value_map.get(ret_format, None)
-        self.exception_check = self.error_value is not None
+        self.exception_check = ret_format != 'r' and self.error_value is not None
         self.is_staticmethod = False
 
     def num_fixed_args(self):