[gcc r14-6557] c++: adjust class-deduction67.C for C++23

[Marek Polacek]

https://gcc.gnu.org/g:767e2674875139ac8f354ceee655c1a9561b9779

commit r14-6557-g767e2674875139ac8f354ceee655c1a9561b9779
Author: Marek Polacek <polacek@redhat.com>
Date:   Thu Dec 14 12:29:23 2023 -0500

    c++: adjust class-deduction67.C for C++23
    
    The test says that CTAD from inherited constructors doesn't work
    before C++23 so we should use c++20_down for the error.
    
    gcc/testsuite/ChangeLog:
    
            * g++.dg/cpp1z/class-deduction67.C: Correct dg-error target.

Diff:
---
 gcc/testsuite/g++.dg/cpp1z/class-deduction67.C | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/g++.dg/cpp1z/class-deduction67.C b/gcc/testsuite/g++.dg/cpp1z/class-deduction67.C
index 74f92325d7a..fa1523d99d5 100644
--- a/gcc/testsuite/g++.dg/cpp1z/class-deduction67.C
+++ b/gcc/testsuite/g++.dg/cpp1z/class-deduction67.C
@@ -16,5 +16,5 @@ int main()
 {
   B b = 42;			// { dg-line init }
   // { dg-prune-output "no matching function" }
-  // { dg-error "class template argument deduction" "" { target c++23_down } init }
+  // { dg-error "class template argument deduction" "" { target c++20_down } init }
 }