[strong] Check super constructor calls

test/mjsunit/strong/classes.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --strong-mode
+// Flags: --harmony-classes --harmony-arrow-functions
 
 'use strong';
 
 class C {}
 
 (function ImmutableClassBindings() {
   class D {}
   assertThrows(function(){ eval("C = 0") }, TypeError);
   assertThrows(function(){ eval("D = 0") }, TypeError);
   assertEquals('function', typeof C);
   assertEquals('function', typeof D);
 })();
+
+function constructor(body) {
+  return "'use strong'; " +
+      "(class extends Object { constructor() { " + body + " } })";
+}
+
+(function NoMissingSuper() {
+  let bodies = [
+    "",
+    "1;"
+  ];
+  for (let b of bodies) assertThrows(constructor(b), SyntaxError);

[marja, 2015/03/13 15:21:20]

Nit: this style of writing tests will give less useful error messages than just
duplicating assertThrows (or a call to a helper function), since from the error
position you don't know which case failed.

+})();
+
+(function NoNestedSuper() {
+  let bodies = [
+    "(super())",
+    "(() => super())(); } })",
+    "{ super();",
+    "if (1) super();",
+  ];
+  for (let b of bodies) assertThrows(constructor(b), SyntaxError);
+})();
+
+(function NoDuplicateSuper() {
+  let bodies = [
+    "super(), super();",
+    "super(); super();",
+    "super(); (super());",
+    "super(); { super() }",
+  ];
+  for (let b of bodies) assertThrows(constructor(b), SyntaxError);
+})();