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// 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);