[gcc r13-2996] libstdc++: Fix broken dg-prune-output

[Jonathan Wakely]

https://gcc.gnu.org/g:7069d03ba4ad6133225b89d433d9e86f0b0745b8

commit r13-2996-g7069d03ba4ad6133225b89d433d9e86f0b0745b8
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Sep 30 19:10:29 2022 +0100

    libstdc++: Fix broken dg-prune-output
    
    The new pattern in the dg-prune-output directive doesn't work. Instead
    of a messy regex full of leaning toothpicks, just match on the
    diagnostic text instead of the header paths.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/20_util/bind/ref_neg.cc: Fix dg-prune-output
            directive.

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

diff --git a/libstdc++-v3/testsuite/20_util/bind/ref_neg.cc b/libstdc++-v3/testsuite/20_util/bind/ref_neg.cc
index 1e9f3e7fece..a78935775c2 100644
--- a/libstdc++-v3/testsuite/20_util/bind/ref_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/bind/ref_neg.cc
@@ -50,7 +50,7 @@ void test02()
 
 // Ignore the reasons for deduction/substitution failure in the headers.
 // Arrange for the match to work on installed trees as well as build trees.
-// { dg-prune-output "[/\\](functional|bits/invoke.h):" }
+// { dg-prune-output "no type named 'type' in 'struct std::result_of" }
 
 int main()
 {