first parameter of @classmethod method is callable

python/src/com/jetbrains/python/inspections/PyCallingNonCallableInspection.java

@@ -52,6 +52,9 @@ public class PyCallingNonCallableInspection extends PyInspection {
         PyType calleeType = myTypeEvalContext.getType(callee);
         if (calleeType instanceof PyClassType) {
           PyClassType classType = (PyClassType) calleeType;
+          if (classType.isDefinition()) {
+            return;
+          }
           PyClass cls = classType.getPyClass();
           if (isMethodType(node, classType)) {
             return;

python/testData/inspections/PyCallingNonCallableInspection/classMethodFirstParam.py

@@ -0,0 +1,4 @@
+class C:
+    @classmethod
+    def foo(cls):
+        return cls()

python/testSrc/com/jetbrains/python/inspections/PyCallingNonCallableTest.java

@@ -35,6 +35,10 @@ public class PyCallingNonCallableTest extends PyLightFixtureTestCase {
     doTest();
   }
   
+  public void testClassMethodFirstParam() {
+    doTest();
+  }
+  
   private void doTest() {
     setLanguageLevel(LanguageLevel.PYTHON27);
     try {