use correct first parameter name (PY-1811)

python/src/com/jetbrains/python/codeInsight/override/PyOverrideImplementUtil.java

@@ -177,7 +177,7 @@ public class PyOverrideImplementUtil {
       statementBody.append("(");
       final LanguageLevel langLevel = ((PyFile)pyClass.getContainingFile()).getLanguageLevel();
       if (!langLevel.isPy3K()) {
-        statementBody.append(pyClass.getName()).append(", self");
+        statementBody.append(pyClass.getName()).append(", ").append(PyUtil.getFirstParameterName(baseFunction));
       }
       statementBody.append(").").append(baseFunction.getName()).append("(");
       startIndex = 1;

python/testData/override/classmethodNewStyle.py

@@ -0,0 +1,7 @@
+class A(object):
+    @classmethod
+    def m(cls):
+        pass
+
+class B(A):
+    <caret>pass

python/testData/override/classmethodNewStyle_after.py

@@ -0,0 +1,10 @@
+class A(object):
+    @classmethod
+    def m(cls):
+        pass
+
+class B(A):
+    @classmethod
+    def m(cls):
+        <selection>super(B, cls).m()</selection>
+

python/testSrc/com/jetbrains/python/PyOverrideTest.java

@@ -42,6 +42,10 @@ public class PyOverrideTest extends PyLightFixtureTestCase {
     doTest();
   }
 
+  public void testClassmethodNewStyle() {
+    doTest();
+  }
+
   public void testPy3k() {
     PythonLanguageLevelPusher.setForcedLanguageLevel(myFixture.getProject(), LanguageLevel.PYTHON31);
     try {