src/dstr-assignment/default/for-of.template

// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
path: language/statements/for-of/dstr/
name: >
    For..of statement
esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
features: [destructuring-binding]
info: |
  IterationStatement :
    for ( LeftHandSideExpression of AssignmentExpression ) Statement

  1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« »,
     AssignmentExpression, iterate).
  2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
     keyResult, assignment, labelSet).

  13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation

  [...]
  4. If destructuring is true and if lhsKind is assignment, then
     a. Assert: lhs is a LeftHandSideExpression.
     b. Let assignmentPattern be the parse of the source text corresponding to
        lhs using AssignmentPattern as the goal symbol.
  [...]
---*/

var counter = 0;

for (/*{ elems }*/ of [/*{ vals }*/]) {
  /*{ body }*/
  counter += 1;
}

assert.sameValue(counter, 1);