test/mjsunit/error-accessors.js

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// Test that the message property of error objects is a data property.

var o;

// message is constructed using the constructor.
var error1 = new Error("custom message");
o = {};
o.__proto__ = error1;

assertEquals("custom message",
             Object.getOwnPropertyDescriptor(error1, "message").value);
o.message = "another message";
assertEquals("another message", o.message);
assertEquals("custom message", error1.message);

// message is constructed by the runtime.
var error2;
try { x.x } catch (e) { error2 = e; }
o = {};
o.__proto__ = error2;

assertEquals("x is not defined",
             Object.getOwnPropertyDescriptor(error2, "message").value);
o.message = "another message";
assertEquals("another message", o.message);
assertEquals("x is not defined", error2.message);