| // Copyright (C) 2014 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| esid: sec-runtime-semantics-classdefinitionevaluation |
| description: > |
| The `this` value of a null-extending class isn't automatically initialized, |
| which makes it necessary to have an explicit return value in the constructor. |
| info: | |
| Runtime Semantics: ClassDefinitionEvaluation |
| |
| [...] |
| 5. If ClassHeritageopt is not present, then |
| [...] |
| 6. Else, |
| [...] |
| b. Let superclass be the result of evaluating ClassHeritage. |
| [...] |
| 15. If ClassHeritageopt is present, then set F's [[ConstructorKind]] internal slot to "derived". |
| [...] |
| |
| 9.2.2 [[Construct]] |
| |
| [...] |
| 15. Return ? envRec.GetThisBinding(). |
| |
| 8.1.1.3.4 GetThisBinding ( ) |
| [...] |
| 3. If envRec.[[ThisBindingStatus]] is "uninitialized", throw a ReferenceError exception. |
| [...] |
| ---*/ |
| |
| class Foo extends null { |
| constructor() { |
| } |
| } |
| |
| assert.throws(ReferenceError, function() { |
| new C(); |
| }); |