test/mjsunit/regress/regress-2398.js

// Copyright 2012 the V8 project authors. All rights reserved.
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"use strict";

var observed = false;

var object = { get toString() { observed = true; } };
Object.defineProperty(object, "ro", { value: 1 });

try {
  object.ro = 2;  // TypeError caused by trying to write to read-only.
} catch (e) {
  e.message;  // Forces formatting of the message object.
}

assertFalse(observed);