test/mjsunit/compiler/regress-2.js

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// The compilation of this function currently fails when resolving
// control flow in the register allocator.
function TestCreateString(n)
{
  var l = n * 1;
  var r = 'r';
  while (r.length < n)
  {
    r = r + r;
  }
  return r;
}

assertEquals("r", TestCreateString(1));
assertEquals("rr", TestCreateString(2));
assertEquals("rrrr", TestCreateString(3));
assertEquals("rrrrrrrr", TestCreateString(6));