lexical-new.target.js (1426B)
1 // Copyright (C) 2015 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 /*--- 4 es6id: 14.2.16 5 description: > 6 Runtime Semantics: Evaluation 7 8 new.target 9 10 ... 11 4. Let closure be FunctionCreate(Arrow, parameters, ConciseBody, scope, strict). 12 ... 13 14 The non-normative note elaborates on the "scope" argument: 15 16 An ArrowFunction does not define local bindings for arguments, super, this, or new.target. Any reference to arguments, super, or this within an ArrowFunction must resolve to a binding in a lexically enclosing environment. Typically this will be the Function Environment of an immediately enclosing function. Even though an ArrowFunction may contain references to super, the function object created in step 4 is not made into a method by performing MakeMethod. An ArrowFunction that references super is always contained within a non-ArrowFunction and the necessary state to implement super is accessible via the scope that is captured by the function object of the ArrowFunction. 17 features: [arrow-function, new.target] 18 ---*/ 19 20 var functionInvocationCount = 0; 21 var newInvocationCount = 0; 22 23 function F() { 24 if ((_ => new.target)() !== undefined) { 25 newInvocationCount++; 26 } 27 functionInvocationCount++; 28 } 29 30 F(); 31 new F(); 32 33 assert.sameValue(functionInvocationCount, 2); 34 assert.sameValue(newInvocationCount, 1); 35 36 reportCompare(0, 0);