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author | wolfbeast <mcwerewolf@gmail.com> | 2018-03-27 13:21:40 +0200 |
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committer | wolfbeast <mcwerewolf@gmail.com> | 2018-03-27 13:21:40 +0200 |
commit | e19749682050ff716fc9ff3bbc05ee3911570670 (patch) | |
tree | 4213a4e8efdaadea0409642702ec6c499f7b9ccc /js/src/tests/ecma_6/Generators/yield-iterator-close.js | |
parent | 72721d1d032db2099593076bf96f274623af3c26 (diff) | |
parent | 70c8cf8db71880c1ab1f8fee4787a19316960dac (diff) | |
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Merge remote-tracking branch 'janek/js_IteratorClose_1'
Diffstat (limited to 'js/src/tests/ecma_6/Generators/yield-iterator-close.js')
-rw-r--r-- | js/src/tests/ecma_6/Generators/yield-iterator-close.js | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Generators/yield-iterator-close.js b/js/src/tests/ecma_6/Generators/yield-iterator-close.js new file mode 100644 index 000000000..970ad494d --- /dev/null +++ b/js/src/tests/ecma_6/Generators/yield-iterator-close.js @@ -0,0 +1,58 @@ +// Test that IteratorClose is called when a Generator is abruptly completed by +// Generator.return. + +var returnCalled = 0; +function* wrapNoThrow() { + let iter = { + [Symbol.iterator]() { + return this; + }, + next() { + return { value: 10, done: false }; + }, + return() { + returnCalled++; + return {}; + } + }; + for (const i of iter) { + yield i; + } +} + +// Breaking calls Generator.return, which causes the yield above to resume with +// an abrupt completion of kind "return", which then calls +// iter.return. +for (const i of wrapNoThrow()) { + break; +} +assertEq(returnCalled, 1); + +function* wrapThrow() { + let iter = { + [Symbol.iterator]() { + return this; + }, + next() { + return { value: 10, done: false }; + }, + return() { + throw 42; + } + }; + for (const i of iter) { + yield i; + } +} + +// Breaking calls Generator.return, which, like above, calls iter.return. If +// iter.return throws, since the yield is resuming with an abrupt completion of +// kind "return", the newly thrown value takes precedence over returning. +assertThrowsValue(() => { + for (const i of wrapThrow()) { + break; + } +}, 42); + +if (typeof reportCompare === "function") + reportCompare(0, 0); |