static void _chainCoreFuture(_Future source, _Future target)
{
D.assert(target._mayAddListener); // Not completed, not already chained.
while (source._isChained)
{
source = source._chainSource;
}
if (source._isComplete)
{
_FutureListener listeners = target._removeListeners();
target._cloneResult(source);
_propagateToListeners(target, listeners);
}
else
{
_FutureListener listeners = (_FutureListener)target._resultOrListeners;
target._setChained(source);
source._prependListeners(listeners);
}
}
