Merge #7892

7892: Fix TokenStream::from_str for input consisting of a single group with delimiter r=edwin0cheng a=kevinmehall

TokenStream holds a `tt::Subtree` but assumes its `delimiter` is always `None`. In particular, the iterator implementation iterates over the inner `token_trees` and ignores the `delimiter`.

However, `TokenStream::from_str` violated this assumption when the input consists of a single group by producing a Subtree with an outer delimiter, which was ignored as seen by a procedural macro.

`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>`.

Fixes #7810
Fixes #7875

Co-authored-by: Kevin Mehall <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/proc_macro_srv/src/proc_macro/bridge/client.rs b/crates/proc_macro_srv/src/proc_macro/bridge/client.rs
index ca6749b9b..b036d4e20 100644
--- a/crates/proc_macro_srv/src/proc_macro/bridge/client.rs
+++ b/crates/proc_macro_srv/src/proc_macro/bridge/client.rs
@@ -238,7 +238,7 @@ macro_rules! define_client_side {
         $(impl $name {
             #[allow(unused)]
             $(pub(crate) fn $method($($arg: $arg_ty),*) $(-> $ret_ty)* {
-                panic!("hello");
+                panic!("crates should be linked against the sysroot version of proc_macro, not this one from rust-analyzer");
                 // Bridge::with(|bridge| {
                 //     let mut b = bridge.cached_buffer.take();