diff options
Diffstat (limited to 'js/src/tests/ecma_6/Object/setPrototypeOf-cycle.js')
-rw-r--r-- | js/src/tests/ecma_6/Object/setPrototypeOf-cycle.js | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Object/setPrototypeOf-cycle.js b/js/src/tests/ecma_6/Object/setPrototypeOf-cycle.js new file mode 100644 index 000000000..a8b5aa75c --- /dev/null +++ b/js/src/tests/ecma_6/Object/setPrototypeOf-cycle.js @@ -0,0 +1,16 @@ +// The cycle check in 9.1.2 [[SetPrototypeOf]] does not walk proxies. +// Therefore it's very easy to create prototype chain cycles involving proxies, +// and the spec requires us to accept this. + +var t = {}; +var p = new Proxy(t, {}); +Object.setPrototypeOf(t, p); // 🙈 + +// Actually doing anything that searches this object's prototype chain +// technically should not terminate. We instead throw "too much recursion". +for (var obj of [t, p]) { + assertThrowsInstanceOf(() => "x" in obj, InternalError); + assertThrowsInstanceOf(() => obj.x, InternalError); + assertThrowsInstanceOf(() => { obj.x = 1; }, InternalError); +} +reportCompare(0, 0); |