Add m-esr52 at 52.6.0

1 files changed, 17 insertions, 0 deletions

diff --git a/js/src/jit-test/tests/saved-stacks/stacks-are-frozen.js b/js/src/jit-test/tests/saved-stacks/stacks-are-frozen.js
new file mode 100644
index 000000000..b2d125aa4
--- /dev/null
+++ b/js/src/jit-test/tests/saved-stacks/stacks-are-frozen.js
@@ -0,0 +1,17 @@
+// Test that SavedFrame instances are frozen and can't be messed with.
+
+// Strict mode so that mutating frozen objects doesn't silently fail.
+"use strict";
+
+const s = saveStack();
+
+load(libdir + 'asserts.js');
+
+assertThrowsInstanceOf(() => s.source = "fake.url",
+                       TypeError);
+
+assertThrowsInstanceOf(() => {
+  Object.defineProperty(s.__proto__, "line", {
+    get: () => 0
+  })
+}, TypeError);