test/mjsunit/stack-traces-custom-lazy.js

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function testPrepareStackTrace(closure) {
  var error = undefined;
  try {
    closure();
    assertUnreachable();
  } catch (e) {
    error = e;
  }

  // We expect custom formatting to be lazy. Setting the custom
  // function right before calling error.stack should be fine.
  Error.prepareStackTrace = function(e, frames) {
    return "bar";
  }

  assertEquals("bar", error.stack);
  Error.prepareStackTrace = undefined;
}

testPrepareStackTrace(function() { throw new Error("foo"); });
testPrepareStackTrace(function f() { f(); });