tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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const-obj-ptrn-prop-id-init-skipped.js (2189B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/obj-ptrn-prop-id-init-skipped.case
      3 // - src/dstr-binding/default/for-of-const.template
      4 /*---
      5 description: Destructuring initializer is not evaluated when value is not `undefined` (for-of statement)
      6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
      7 features: [destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    IterationStatement :
     11        for ( ForDeclaration of AssignmentExpression ) Statement
     12 
     13    [...]
     14    3. Return ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
     15       lexicalBinding, labelSet).
     16 
     17    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
     18 
     19    [...]
     20    3. Let destructuring be IsDestructuring of lhs.
     21    [...]
     22    5. Repeat
     23       [...]
     24       h. If destructuring is false, then
     25          [...]
     26       i. Else
     27          i. If lhsKind is assignment, then
     28             [...]
     29          ii. Else if lhsKind is varBinding, then
     30              [...]
     31          iii. Else,
     32               1. Assert: lhsKind is lexicalBinding.
     33               2. Assert: lhs is a ForDeclaration.
     34               3. Let status be the result of performing BindingInitialization
     35                  for lhs passing nextValue and iterationEnv as arguments.
     36          [...]
     37 
     38    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
     39 
     40    BindingElement : BindingPattern Initializeropt
     41 
     42    [...]
     43    3. If Initializer is present and v is undefined, then
     44    [...]
     45 ---*/
     46 var initCount = 0;
     47 function counter() {
     48  initCount += 1;
     49 }
     50 
     51 var iterCount = 0;
     52 
     53 for (const { s: t = counter(), u: v = counter(), w: x = counter(), y: z = counter() } of [{ s: null, u: 0, w: false, y: '' }]) {
     54  assert.sameValue(t, null);
     55  assert.sameValue(v, 0);
     56  assert.sameValue(x, false);
     57  assert.sameValue(z, '');
     58  assert.sameValue(initCount, 0);
     59 
     60  assert.throws(ReferenceError, function() {
     61    s;
     62  });
     63  assert.throws(ReferenceError, function() {
     64    u;
     65  });
     66  assert.throws(ReferenceError, function() {
     67    w;
     68  });
     69  assert.throws(ReferenceError, function() {
     70    y;
     71  });
     72 
     73  iterCount += 1;
     74 }
     75 
     76 assert.sameValue(iterCount, 1, 'iteration occurred as expected');
     77 
     78 reportCompare(0, 0);