tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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rhs-yield-present.js (1013B)

      1 // Copyright 2021 the V8 project authors.  All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 
      4 /*---
      5 description: Parsing observes the `Yield` production parameter when present
      6 info: |
      7  Syntax
      8    RelationalExpression[In, Yield, Await]:
      9    [...]
     10    [+In] RelationalExpression[+In, ?Yield, ?Await] in ShiftExpression[?Yield, ?Await]
     11 
     12  [...]
     13 
     14  1. Let lref be the result of evaluating RelationalExpression.
     15  2. Let lval be ? GetValue(lref).
     16  3. Let rref be the result of evaluating ShiftExpression.
     17  4. Let rval be ? GetValue(rref).
     18  5. If Type(rval) is not Object, throw a TypeError exception.
     19  6. Return ? HasProperty(rval, ? ToPropertyKey(lval)).
     20 esid: sec-relational-operators-runtime-semantics-evaluation
     21 ---*/
     22 
     23 function * isNameIn() {
     24  return '' in (yield);
     25 }
     26 
     27 let iter1 = isNameIn();
     28 iter1.next();
     29 assert.sameValue(iter1.next({'': 0}).value, true);
     30 
     31 let iter2 = isNameIn();
     32 iter2.next();
     33 assert.sameValue(iter2.next({}).value, false);
     34 
     35 reportCompare(0, 0);