fix issue https://github.com/Microsoft/TypeScript/issues/3991

src/compiler/checker.ts

@@ -10449,7 +10449,10 @@ namespace ts {
                     case SyntaxKind.FunctionExpression:
                     case SyntaxKind.FunctionDeclaration:
                     case SyntaxKind.ArrowFunction:
-                    case SyntaxKind.ObjectLiteralExpression: return false;
+                    case SyntaxKind.ClassExpression:
+                    case SyntaxKind.ClassDeclaration:
+                    case SyntaxKind.GetAccessor:
+                    case SyntaxKind.SetAccessor: return false;
                     default: return forEachChild(n, containsSuperCall);
                 }
             }