tor-browser

The Tor Browser
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async-gen-decl-dstr-array-elem-init-fn-name-cover.js (2167B)

      1 // |reftest| async
      2 // This file was procedurally generated from the following sources:
      3 // - src/dstr-assignment-for-await/array-elem-init-fn-name-cover.case
      4 // - src/dstr-assignment-for-await/default/async-gen-decl.template
      5 /*---
      6 description: Assignment of function `name` attribute (CoverParenthesizedExpression) (for-await-of statement in an async generator declaration)
      7 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
      8 features: [destructuring-binding, async-iteration]
      9 flags: [generated, async]
     10 includes: [propertyHelper.js]
     11 info: |
     12    IterationStatement :
     13      for await ( LeftHandSideExpression of AssignmentExpression ) Statement
     14 
     15    1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« »,
     16       AssignmentExpression, iterate).
     17    2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
     18       keyResult, assignment, labelSet).
     19 
     20    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
     21 
     22    [...]
     23    5. If destructuring is true and if lhsKind is assignment, then
     24       a. Assert: lhs is a LeftHandSideExpression.
     25       b. Let assignmentPattern be the parse of the source text corresponding to
     26          lhs using AssignmentPattern as the goal symbol.
     27    [...]
     28 
     29    AssignmentElement[Yield] : DestructuringAssignmentTarget Initializeropt
     30    [...] 7. If Initializer is present and value is undefined and
     31       IsAnonymousFunctionDefinition(Initializer) and IsIdentifierRef of
     32       DestructuringAssignmentTarget are both true, then
     33       a. Let hasNameProperty be ? HasOwnProperty(v, "name").
     34       b. If hasNameProperty is false, perform SetFunctionName(v, GetReferencedName(lref)).
     35 
     36 ---*/
     37 let xCover, cover;
     38 
     39 let iterCount = 0;
     40 async function * fn() {
     41  for await ([ xCover = (0, function() {}), cover = (function() {}) ] of [[]]) {
     42    assert(xCover.name !== 'xCover');
     43 
     44    verifyProperty(cover, 'name', {
     45      enumerable: false,
     46      writable: false,
     47      configurable: true,
     48      value: 'cover'
     49    });
     50 
     51    iterCount += 1;
     52  }
     53 }
     54 
     55 let promise = fn().next();
     56 
     57 promise
     58  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
     59  .then($DONE, $DONE);