Change `AttrTokenStream::to_tokenstream` to `to_token_trees`.

I.e. change the return type from `TokenStream` to `Vec<TokenTree>`.

Most of the callsites require a `TokenStream`, but the recursive call
used to create `target_tokens` requires a `Vec<TokenTree>`. It's easy
to convert a `Vec<TokenTree>` to a `TokenStream` (just call
`TokenStream::new`) but it's harder to convert a `TokenStream` to a
`Vec<TokenTree>` (either iterate/clone/collect, or use `Lrc::into_inner`
if appropriate).

So this commit changes the return value to simplify that `target_tokens`
call site.

0 files changed, 0 insertions, 0 deletions