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/tests/utils.rs b/crates/proc_macro_srv/src/tests/utils.rs
index 22813052d..0484c3af4 100644
--- a/crates/proc_macro_srv/src/tests/utils.rs
+++ b/crates/proc_macro_srv/src/tests/utils.rs
@@ -52,7 +52,7 @@ pub fn assert_expand(
     let expander = dylib::Expander::new(&path).unwrap();
     let fixture = parse_string(ra_fixture).unwrap();
 
-    let res = expander.expand(macro_name, &fixture.subtree, None).unwrap();
+    let res = expander.expand(macro_name, &fixture.into_subtree(), None).unwrap();
     assert_eq_text!(&expect.trim(), &format!("{:?}", res));
 }