public void TestExt_AsList()
{
var add = F.Call(S.Add, a, one);
var assign = F.Call(S.Assign, a, b);
var splice = F.Splice(add, assign);
ExpectList(add.AsList(S.Splice), add);
ExpectList(splice.AsList(S.Splice), add, assign);
ExpectList(splice.AsList(S.Tuple), splice);
}