From dfbb7c264dae448e92500c0e7cc5816fc4086a0e Mon Sep 17 00:00:00 2001
From: Jason Merrill <jason@redhat.com>
Date: Thu, 25 Jul 2024 23:09:31 -0400
Subject: c++: trait as typename scope [PR116052]

The stdexec library currently wrongly ends up using __decay as the scope of
a typename, which leads to a crash.  Let's give an error instead.

	PR c++/116052

gcc/cp/ChangeLog:

	* mangle.cc (write_prefix): Handle TRAIT_EXPR.

gcc/testsuite/ChangeLog:

	* g++.dg/ext/decay1.C: New test.
---
 gcc/cp/mangle.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'gcc/cp/mangle.cc')

diff --git a/gcc/cp/mangle.cc b/gcc/cp/mangle.cc
index a04bc58..e739122 100644
--- a/gcc/cp/mangle.cc
+++ b/gcc/cp/mangle.cc
@@ -1300,7 +1300,8 @@ write_prefix (const tree node)
 
   MANGLE_TRACE_TREE ("prefix", node);
 
-  if (TREE_CODE (node) == DECLTYPE_TYPE)
+  if (TREE_CODE (node) == DECLTYPE_TYPE
+      || TREE_CODE (node) == TRAIT_TYPE)
     {
       write_type (node);
       return;
-- 
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