From 0950da97ae12ff30367dda482e73e9e3f4bf07b3 Mon Sep 17 00:00:00 2001
From: Keith-Cancel <Keith-Cancel@users.noreply.github.com>
Date: Sat, 22 Nov 2025 16:59:32 -0800
Subject: [PATCH 1/2] Make `proc_macro::Group` take up less space remove
 redundant field.

The field `entire` is redundant. This saves 4 bytes and makes the DelimSpan match up with what the compiler uses.
---
 compiler/rustc_expand/src/proc_macro_server.rs | 6 +-----
 library/proc_macro/src/bridge/mod.rs           | 5 ++---
 library/proc_macro/src/lib.rs                  | 3 ++-
 3 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/compiler/rustc_expand/src/proc_macro_server.rs b/compiler/rustc_expand/src/proc_macro_server.rs
index 0e063011eea49..cd17b6e2ed028 100644
--- a/compiler/rustc_expand/src/proc_macro_server.rs
+++ b/compiler/rustc_expand/src/proc_macro_server.rs
@@ -151,11 +151,7 @@ impl FromInternal<(TokenStream, &mut Rustc<'_, '_>)> for Vec<TokenTree<TokenStre
                     trees.push(TokenTree::Group(Group {
                         delimiter: rustc_proc_macro::Delimiter::from_internal(delim),
                         stream: Some(stream),
-                        span: DelimSpan {
-                            open: span.open,
-                            close: span.close,
-                            entire: span.entire(),
-                        },
+                        span: DelimSpan { open: span.open, close: span.close },
                     }));
                     continue;
                 }
diff --git a/library/proc_macro/src/bridge/mod.rs b/library/proc_macro/src/bridge/mod.rs
index b0ee9c0cc3027..a2a797307fb6e 100644
--- a/library/proc_macro/src/bridge/mod.rs
+++ b/library/proc_macro/src/bridge/mod.rs
@@ -420,16 +420,15 @@ compound_traits!(
 pub struct DelimSpan<Span> {
     pub open: Span,
     pub close: Span,
-    pub entire: Span,
 }
 
 impl<Span: Copy> DelimSpan<Span> {
     pub fn from_single(span: Span) -> Self {
-        DelimSpan { open: span, close: span, entire: span }
+        DelimSpan { open: span, close: span }
     }
 }
 
-compound_traits!(struct DelimSpan<Span> { open, close, entire });
+compound_traits!(struct DelimSpan<Span> { open, close });
 
 #[derive(Clone)]
 pub struct Group<TokenStream, Span> {
diff --git a/library/proc_macro/src/lib.rs b/library/proc_macro/src/lib.rs
index 4efdfcad924b5..d4e5e458e723c 100644
--- a/library/proc_macro/src/lib.rs
+++ b/library/proc_macro/src/lib.rs
@@ -847,7 +847,8 @@ impl Group {
     /// ```
     #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
     pub fn span(&self) -> Span {
-        Span(self.0.span.entire)
+        let sp = self.0.span;
+        Span(sp.open.join(sp.close).unwrap_or(sp.open))
     }
 
     /// Returns the span pointing to the opening delimiter of this group.

From b02300eacab8613f7c023c305f4007ac7fe575d6 Mon Sep 17 00:00:00 2001
From: Keith-Cancel <Keith-Cancel@users.noreply.github.com>
Date: Sat, 22 Nov 2025 18:38:08 -0800
Subject: [PATCH 2/2] Update to match.

---
 .../crates/proc-macro-srv/src/server_impl/token_stream.rs        | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/tools/rust-analyzer/crates/proc-macro-srv/src/server_impl/token_stream.rs b/src/tools/rust-analyzer/crates/proc-macro-srv/src/server_impl/token_stream.rs
index c5019a5917221..8a9a22b6a044d 100644
--- a/src/tools/rust-analyzer/crates/proc-macro-srv/src/server_impl/token_stream.rs
+++ b/src/tools/rust-analyzer/crates/proc-macro-srv/src/server_impl/token_stream.rs
@@ -104,7 +104,6 @@ impl<S: Copy> TokenStream<S> {
                         span: bridge::DelimSpan {
                             open: subtree.delimiter.open,
                             close: subtree.delimiter.close,
-                            entire: join_spans(subtree.delimiter.open, subtree.delimiter.close),
                         },
                     }))
                 }