test/mjsunit/regress/regress-map-invalidation-1.js

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// Flags: --allow-natives-syntax

var c = { x: 2, y: 1 };

function h() {
  %TryMigrateInstance(c);
  return 2;
}
%NeverOptimizeFunction(h);

function f() {
  for (var i = 0; i < 100000; i++) {
    var n = c.x + h();
    assertEquals(4, n);
  }
  var o2 = [{ x: 2.5, y:1 }];
  return o2;
}

f();