fix code generated for __dealloc__() and __releasebuffer__() to call...

fix code generated for __dealloc__() and __releasebuffer__() to call WriteUnraisable() on exceptions instead of building a useless traceback

Cython/Compiler/ModuleNode.py

@@ -1293,7 +1293,6 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
         code.putln("PyErr_Fetch(&etype, &eval, &etb);")
         code.putln("++Py_REFCNT(o);")
         code.putln("%s(o);" % entry.func_cname)
-        code.putln("if (PyErr_Occurred()) PyErr_WriteUnraisable(o);")
         code.putln("--Py_REFCNT(o);")
         code.putln("PyErr_Restore(etype, eval, etb);")
         code.putln("}")

Cython/Compiler/Nodes.py

@@ -2788,7 +2788,7 @@ class DefNode(FuncDefNode):
         return self.entry.signature.error_value
 
     def caller_will_check_exceptions(self):
-        return 1
+        return self.entry.signature.exception_check
 
     def generate_function_definitions(self, env, code):
         if self.defaults_getter:

Cython/Compiler/TypeSlots.py

@@ -93,6 +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.is_staticmethod = False
 
     def num_fixed_args(self):
@@ -135,7 +136,9 @@ class Signature(object):
         else:
             ret_type = self.return_type()
         exc_value = self.exception_value()
-        return PyrexTypes.CFuncType(ret_type, args, exception_value = exc_value)
+        return PyrexTypes.CFuncType(
+            ret_type, args, exception_value=exc_value,
+            exception_check=self.exception_check)
 
     def method_flags(self):
         if self.ret_format == "O":