// Regression test for issue #594
// Map keys pushed into a vector via .first should remain valid
// after the map goes out of scope.

def keys(Map map)
{
  var v = Vector();
  for( i : map )
  {
    v.push_back(i.first);
  }
  return v;
}

var k = Vector();
if ( true )
{
  var m = ["a":"x", "b":"y", "c":"z"];
  k = keys(m);
}

// After the map is out of scope, the keys should still be valid strings
assert_equal(3, k.size())

// Verify each element is a non-empty string
for (elem : k)
{
  assert_true(elem.size() > 0)
}