Refactor TokenStream to hold Vec<TokenTree> instead of tt::Subtree

`TokenStream` assumes that its subtree's delimeter is `None`, and this
should be encoded in the type system instead of having a delimiter field
that is mostly ignored.

`tt::Subtree` is just `pub delimiter: Option<Delimiter>, pub
token_trees: Vec<TokenTree>`, so a Subtree that is statically guaranteed
not to have a delimiter is just Vec<TokenTree>.

1 files changed, 3 insertions, 3 deletions

diff --git a/crates/proc_macro_srv/src/dylib.rs b/crates/proc_macro_srv/src/dylib.rs
index 28a6ee547..baf10fea9 100644
--- a/crates/proc_macro_srv/src/dylib.rs
+++ b/crates/proc_macro_srv/src/dylib.rs
@@ -138,7 +138,7 @@ impl Expander {
                         parsed_body,
                         false,
                     );
-                    return res.map(|it| it.subtree);
+                    return res.map(|it| it.into_subtree());
                 }
                 bridge::client::ProcMacro::Bang { name, client } if *name == macro_name => {
                     let res = client.run(
@@ -147,7 +147,7 @@ impl Expander {
                         parsed_body,
                         false,
                     );
-                    return res.map(|it| it.subtree);
+                    return res.map(|it| it.into_subtree());
                 }
                 bridge::client::ProcMacro::Attr { name, client } if *name == macro_name => {
                     let res = client.run(
@@ -157,7 +157,7 @@ impl Expander {
                         parsed_body,
                         false,
                     );
-                    return res.map(|it| it.subtree);
+                    return res.map(|it| it.into_subtree());
                 }
                 _ => continue,
             }