Noargs super() support for cdef classes

Cython/Compiler/ParseTreeTransforms.py

@@ -2424,11 +2424,11 @@ class TransformBuiltinMethods(EnvTransform):
             return node
         # Inject no-args super
         def_node = self.current_scope_node()
-        if (not isinstance(def_node, Nodes.DefNode) or
+        if (not isinstance(def_node, Nodes.DefNode) or not def_node.args or
             len(self.env_stack) < 2):
             return node
         class_node, class_scope = self.env_stack[-2]
-        if class_scope.is_py_class_scope and def_node.args:
+        if class_scope.is_py_class_scope:
             def_node.requires_classobj = True
             class_node.class_cell.is_active = True
             node.args = [
@@ -2436,7 +2436,13 @@ class TransformBuiltinMethods(EnvTransform):
                     node.pos, is_generator=def_node.is_generator),
                 ExprNodes.NameNode(node.pos, name=def_node.args[0].name)
                 ]
-            return node
+        elif class_scope.is_c_class_scope:
+            node.args = [
+                ExprNodes.NameNode(
+                    node.pos, name=class_node.scope.name,
+                    entry=class_node.entry),
+                ExprNodes.NameNode(node.pos, name=def_node.args[0].name)
+                ]
         return node
 
     def visit_SimpleCallNode(self, node):

tests/run/py3k_super.pyx

@@ -59,3 +59,17 @@ def test_class_cell_empty():
     class EmptyClassCell(metaclass=Base):
         def foo(self):
             super()
+
+
+cdef class CClassBase(object):
+    def method(self):
+        return 1
+
+cdef class CClassSuper(CClassBase):
+    """
+    >>> CClassSuper().method()
+    1
+    """
+
+    def method(self):
+        return super().method()