test/mjsunit/regress/regress-2055.js

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// Test that array literal boilerplate objects can be transitioned while
// existing un-transitioned clones are still being populated.

function test1(depth) {
  if (--depth < 0) {
    return [];
  } else {
    return [ 0, test1(depth) ];
  }
}
assertEquals([0,[0,[]]], test1(2));

function test2(depth) {
  if (--depth < 0) {
    return [];
  } else {
    var o = [ 0, test2(depth) ];
    return (depth == 0) ? 0.5 : o;
  }
}
assertEquals([0,0.5], test2(2));