test/mjsunit/compiler/regress-1.js

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function DaysInYear(y) {
  if (y % 4 != 0) return 365;
  if (y % 4 == 0 && y % 100 != 0) return 366;
  if (y % 100 == 0 && y % 400 != 0) return 365;
  if (y % 400 == 0) return 366;
}
assertEquals(365, DaysInYear(1999));
assertEquals(366, DaysInYear(2000));