keep type information when coercing C complex to Python complex

Cython/Compiler/ExprNodes.py

@@ -1672,7 +1672,7 @@ class ImagNode(AtomicExprNode):
         node = ImagNode(self.pos, value=self.value)
         if dst_type.is_pyobject:
             node.is_temp = 1
-            node.type = PyrexTypes.py_object_type
+            node.type = Builtin.complex_type
         # We still need to perform normal coerce_to processing on the
         # result, because we might be coercing to an extension type,
         # in which case a type test node will be needed.