create a new trie should only be used with K = *token.Token and V = ast.Alias.

though generic it is only meant to be used with K = *token.Token and V = ast.Alias.

generate keys for the trie it is given a unique, incrementing index for the node visited and the key of the possible child should return false if there are no keys left on the path should not be stateful or be able to revert to a previous state using the index.