correct resolve roof for private names in superclass list of a class (PY-2618)

python/src/com/jetbrains/python/psi/impl/PyReferenceImpl.java

@@ -234,7 +234,10 @@ public class PyReferenceImpl implements PsiReferenceEx, PsiPolyVariantReference
       }
       while (one instanceof PyFunction);
       if (one instanceof PyClass) {
-        return one;
+        PyArgumentList superClassExpressionList = ((PyClass)one).getSuperClassExpressionList();
+        if (superClassExpressionList == null || !PsiTreeUtil.isAncestor(superClassExpressionList, myElement, false)) {
+          return one;
+        }
       }
     }
     

python/testData/resolve/PrivateInsideModule.py

@@ -0,0 +1,3 @@
+class __VeryPrivate(object): pass
+class Public(__VeryPrivate): pass
+#              <ref>

python/testSrc/com/jetbrains/python/PyResolveTest.java

@@ -388,4 +388,8 @@ public class PyResolveTest extends PyResolveTestCase {
   public void testWithParentheses() {
     assertResolvesTo(LanguageLevel.PYTHON27, PyTargetExpression.class, "MockClass1");
   }
+
+  public void testPrivateInsideModule() {  // PY-2618
+    assertResolvesTo(PyClass.class, "__VeryPrivate");
+  }
 }