[gcc r16-7137] libstdc++: Fix non-ASCII characters in <contracts> header

[Jonathan Wakely]

https://gcc.gnu.org/g:95ed4da2291b1f108f6c50bb06953777e2c80113

commit r16-7137-g95ed4da2291b1f108f6c50bb06953777e2c80113
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Jan 29 12:12:45 2026 +0000

    libstdc++: Fix non-ASCII characters in <contracts> header
    
    This fixes:
    FAIL: 17_intro/headers/c++1998/charset.cc  -std=gnu++26 (test for excess errors)
    
    libstdc++-v3/ChangeLog:
    
            * include/std/contracts: Replace non-ASCII characters.

Diff:
---
 libstdc++-v3/include/std/contracts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libstdc++-v3/include/std/contracts b/libstdc++-v3/include/std/contracts
index 2cf67ac1dd88..0fd9b10247ea 100644
--- a/libstdc++-v3/include/std/contracts
+++ b/libstdc++-v3/include/std/contracts
@@ -52,7 +52,7 @@ namespace contracts
     post = 2,
     assert = 3,
 
-    /* Implementation−defined values should have a minimum value of 1000. */
+    /* Implementation-defined values should have a minimum value of 1000. */
   };
 
   enum class evaluation_semantic : __UINT16_TYPE__ {
@@ -61,14 +61,14 @@ namespace contracts
     enforce = 3,
     quick_enforce = 4,
 
-    /* Implementation−defined values should have a minimum value of 1000.  */
+    /* Implementation-defined values should have a minimum value of 1000.  */
   };
 
   enum class detection_mode : __UINT16_TYPE__ {
     predicate_false = 1,
     evaluation_exception = 2,
 
-    /* Implementation−defined values should have a minimum value of 1000. */
+    /* Implementation-defined values should have a minimum value of 1000. */
   };
 
   using __vendor_ext = void;