From 436ce07eedae4db7e0138d3d8d55d8666b2ba3a4 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Fri, 5 Jan 2024 18:46:57 -0800
Subject: [PATCH] Add link to dead_code autotrait bug

https://github.com/rust-lang/rust/issues/119645
---
 src/marker.rs                 | 5 ++++-
 tests/ui/test-not-send.stderr | 2 +-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/marker.rs b/src/marker.rs
index 25c1555..e8874bd 100644
--- a/src/marker.rs
+++ b/src/marker.rs
@@ -12,7 +12,10 @@ mod value {
     pub(crate) use core::marker::PhantomData as Marker;
 }
 
-pub(crate) struct ProcMacroAutoTraits(#[allow(dead_code)] Rc<()>);
+pub(crate) struct ProcMacroAutoTraits(
+    #[allow(dead_code)] // https://github.com/rust-lang/rust/issues/119645
+    Rc<()>,
+);
 
 impl UnwindSafe for ProcMacroAutoTraits {}
 impl RefUnwindSafe for ProcMacroAutoTraits {}
diff --git a/tests/ui/test-not-send.stderr b/tests/ui/test-not-send.stderr
index d215533..abaab5a 100644
--- a/tests/ui/test-not-send.stderr
+++ b/tests/ui/test-not-send.stderr
@@ -31,7 +31,7 @@ error[E0277]: `Rc<()>` cannot be sent between threads safely
 note: required because it appears within the type `proc_macro2::marker::ProcMacroAutoTraits`
  --> $WORKSPACE/src/marker.rs
   |
-  | pub(crate) struct ProcMacroAutoTraits(#[allow(dead_code)] Rc<()>);
+  | pub(crate) struct ProcMacroAutoTraits(
   |                   ^^^^^^^^^^^^^^^^^^^
 note: required because it appears within the type `PhantomData<proc_macro2::marker::ProcMacroAutoTraits>`
  --> $RUST/core/src/marker.rs