test262/test/language/statements/class/definition/invalid-extends.js

// Copyright (C) 2014 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 14.5
description: >
    class invalid extends
---*/
assert.throws(TypeError, function() {
  class C extends 42 {}
});

assert.throws(TypeError, function() {
  // Function but its .prototype is not null or a function.
  class C extends Math.abs {}
});

assert.throws(TypeError, function() {
  Math.abs.prototype = 42;
  class C extends Math.abs {}
});
delete Math.abs.prototype;