private QilNode CompileSingleKey(List <Key> defList, QilNode key, IFocus env)
{
Debug.Assert(defList != null && defList.Count > 0);
if (defList.Count == 1)
{
return(_f.Invoke(defList[0].Function, _f.ActualParameterList(env.GetCurrent(), key)));
}
QilIterator i = _f.Let(key);
QilNode result = _f.Sequence();
foreach (Key keyDef in defList)
{
result.Add(_f.Invoke(keyDef.Function, _f.ActualParameterList(env.GetCurrent(), i)));
}
return(_f.Loop(i, result));
}
