test/mjsunit/regress/regress-1389.js

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// Test optimized implementation of postfix ++ on undefined input.
// See http://code.google.com/p/v8/issues/detail?id=1389

for (var i=0; i<4; i++) {
  (function () {
    (function () {
      (function () {
        var x;
        y = x++;
      })();
    })();
  })();
}

assertEquals(NaN, y);