Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/js/src/tests/non262/operators/instanceof-bound-function-recursion.js b/js/src/tests/non262/operators/instanceof-bound-function-recursion.js
new file mode 100644
index 0000000000..133b84f2f9
--- /dev/null
+++ b/js/src/tests/non262/operators/instanceof-bound-function-recursion.js
@@ -0,0 +1,23 @@
+function f() {}
+
+var fn = f;
+for (var i = 0; i < 100000; ++i) {
+  fn = fn.bind();
+
+  // Ensure we don't fallback to @@hasInstance from %FunctionPrototype%.
+  Object.defineProperty(fn, Symbol.hasInstance, {
+    value: undefined, writable: true, enumerable: true, writable: true
+  });
+
+  // Prevent generating overlong names of the form "bound bound bound [...] f".
+  Object.defineProperty(fn, "name", {
+    value: "", writable: true, enumerable: true, writable: true
+  });
+}
+
+assertThrowsInstanceOf(
+  () => ({}) instanceof fn,
+  Error,
+  "detect runaway recursion delegating instanceof to bound function target");
+
+reportCompare(0, 0);