tor-browser

The Tor Browser
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tco-pos-undefined-strict.js (802B)

      1 // |reftest| skip -- tail-call-optimization is not supported
      2 'use strict';
      3 // Copyright (C) 2019 Leo Balter. All rights reserved.
      4 // This code is governed by the BSD license found in the LICENSE file.
      5 
      6 /*---
      7 description: Expression is a candidate for tail-call optimization.
      8 esid: sec-static-semantics-hascallintailposition
      9 info: |
     10  Expression Rules
     11 
     12  CoalesceExpression : CoalesceExpressionHead ?? BitwiseORExpression
     13 
     14  1. Return HasCallInTailPosition of BitwiseORExpression with argument call.
     15 flags: [onlyStrict]
     16 features: [tail-call-optimization, coalesce-expression]
     17 includes: [tcoHelper.js]
     18 ---*/
     19 
     20 var callCount = 0;
     21 (function f(n) {
     22  if (n === 0) {
     23    callCount += 1
     24    return;
     25  }
     26  return undefined ?? f(n - 1);
     27 }($MAX_ITERATIONS));
     28 assert.sameValue(callCount, 1);
     29 
     30 reportCompare(0, 0);