// Copyright 2021 the V8 project authors.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
description: Parsing observes the `Yield` production parameter when absent (without strict mode)
info: |
  Syntax
    RelationalExpression[In, Yield, Await]:
    [...]
    [+In] RelationalExpression[+In, ?Yield, ?Await] in ShiftExpression[?Yield, ?Await]

  [...]

  1. Let lref be the result of evaluating RelationalExpression.
  2. Let lval be ? GetValue(lref).
  3. Let rref be the result of evaluating ShiftExpression.
  4. Let rval be ? GetValue(rref).
  5. If Type(rval) is not Object, throw a TypeError exception.
  6. Return ? HasProperty(rval, ? ToPropertyKey(lval)).
esid: sec-relational-operators
flags: [noStrict]
---*/

var yield;

yield = {'': 0};
assert.sameValue('' in (yield), true);

yield = {};
assert.sameValue('' in (yield), false);