[PATCH v2 1/2] libstdc++: Silence a warning in a test for span.

[Luc Grosheintz]

In a test of span, there's an unused variable myspan. This
commit silences the warning.

libstdc++-v3/ChangeLog:

        * testsuite/23_containers/span/contiguous_range_neg.cc: Silence
        warning about unused variable myspan.

Signed-off-by: Luc Grosheintz <luc.groshei...@gmail.com>
---
 .../testsuite/23_containers/span/contiguous_range_neg.cc         | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libstdc++-v3/testsuite/23_containers/span/contiguous_range_neg.cc 
b/libstdc++-v3/testsuite/23_containers/span/contiguous_range_neg.cc
index c9e9112ed6d..890fdf8aea0 100644
--- a/libstdc++-v3/testsuite/23_containers/span/contiguous_range_neg.cc
+++ b/libstdc++-v3/testsuite/23_containers/span/contiguous_range_neg.cc
@@ -25,6 +25,7 @@ main()
 {
   std::deque<int> d{};
   std::span<int, std::dynamic_extent> myspan(d); // { dg-error "no match" }
+  (void) myspan;
 }
 
 // { dg-prune-output "data" }
-- 
2.49.0