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Diffstat (limited to 'js/src/tests/test262/annexB/language/expressions/assignment/dstr/object-pattern-emulates-undefined.js')
-rw-r--r-- | js/src/tests/test262/annexB/language/expressions/assignment/dstr/object-pattern-emulates-undefined.js | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/test262/annexB/language/expressions/assignment/dstr/object-pattern-emulates-undefined.js b/js/src/tests/test262/annexB/language/expressions/assignment/dstr/object-pattern-emulates-undefined.js new file mode 100644 index 0000000000..d9fe3d1bc3 --- /dev/null +++ b/js/src/tests/test262/annexB/language/expressions/assignment/dstr/object-pattern-emulates-undefined.js @@ -0,0 +1,37 @@ +// Copyright (C) 2020 Alexey Shvayka. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. +/*--- +esid: sec-destructuring-binding-patterns-runtime-semantics-bindinginitialization +description: > + Destructuring initializer is not evaluated when value is an object + with [[IsHTMLDDA]] internal slot. +info: | + BindingPattern : ObjectBindingPattern + + 1. Perform ? RequireObjectCoercible(value). + 2. Return the result of performing BindingInitialization for + ObjectBindingPattern using value and environment as arguments. + + Runtime Semantics: KeyedBindingInitialization + + SingleNameBinding : BindingIdentifier Initializer[opt] + + [...] + 4. If Initializer is present and v is undefined, then + [...] + 5. If environment is undefined, return ? PutValue(lhs, v). +features: [destructuring-binding, IsHTMLDDA] +---*/ + +var initCount = 0; +var counter = function() { + initCount += 1; +}; + +var x, IsHTMLDDA = $262.IsHTMLDDA; +({x = counter()} = {x: IsHTMLDDA}); + +assert.sameValue(x, IsHTMLDDA); +assert.sameValue(initCount, 0); + +reportCompare(0, 0); |