tiny cleanup

diff --git a/Cython/Compiler/Optimize.py b/Cython/Compiler/Optimize.py
index 091dfa54e3a900957a8d77e452f80e85f887ed9a..83583fe9bc5f9651438390a3e51418a1c8c7cc61 100644 (file)
--- a/Cython/Compiler/Optimize.py
+++ b/Cython/Compiler/Optimize.py
@@ -685,7 +685,7 @@ class OptimizeBuiltinCalls(Visitor.VisitorTransform):
                 return function_handler(node, arg_tuple, kwargs)
             else:
                 return function_handler(node, arg_tuple)
-        elif isinstance(function, ExprNodes.AttributeNode):
+        elif function.is_attribute:
             arg_list = arg_tuple.args
             self_arg = function.obj
             obj_type = self_arg.type