[gcc r14-3651] libstdc++: Add missing target selector to std::expected test

[Jonathan Wakely]

https://gcc.gnu.org/g:c34ad4bc1970dc168b0081edf9994d108ff0f130

commit r14-3651-gc34ad4bc1970dc168b0081edf9994d108ff0f130
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Sep 1 21:19:36 2023 +0100

    libstdc++: Add missing target selector to std::expected test
    
    This test should use a target selector of c++23 so that the explicit
    -std=gnu++23 option can be removed, to allow testing with later
    standards too.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/20_util/expected/bad.cc: Add missing target
            selector.

Diff:
---
 libstdc++-v3/testsuite/20_util/expected/bad.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/testsuite/20_util/expected/bad.cc b/libstdc++-v3/testsuite/20_util/expected/bad.cc
index 17bc6d69e886..e5d7ba4afb04 100644
--- a/libstdc++-v3/testsuite/20_util/expected/bad.cc
+++ b/libstdc++-v3/testsuite/20_util/expected/bad.cc
@@ -1,5 +1,5 @@
 // { dg-options "-std=gnu++23" }
-// { dg-do compile }
+// { dg-do compile { target c++23 } }
 
 #include <expected>