v8/test/mjsunit/with-readonly.js

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// Test that readonly variables are treated correctly.

// Create an object with a read-only length property in the prototype
// chain by putting the string split function in the prototype chain.
var o = {};
o.__proto__ = String.prototype.split;

function f() {
  with (o) {
    length = 23;
    length = 24;
    assertEquals(2, length);
  }
  assertEquals(2, o.length);
}
f();