test/mjsunit/regress/readonly2.js

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Object.defineProperty(this, "x", { writable:true });

function s(v) {
  v.x = 1;
}

function s_strict(v) {
  "use strict";
  v.x = 1;
}

function c(p) {
  return {__proto__: p};
}

var o1 = c(this);
var o2 = c(this);

// Initialize the store IC.
s(c(this));
s(c(this));
s_strict(c(this));
s_strict(c(this));

// Make x non-writable.
Object.defineProperty(this, "x", { writable:false, value:5 });

// Verify that direct setting fails.
o1.x = 20;
assertEquals(5, o1.x);

// Verify that setting through the IC fails.
s(o2);
assertEquals(5, o2.x);
assertThrows("s_strict(o2);", TypeError);