commit 3a7f3e87680cc0ca20318b0983d517cd32851fc5
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Nov 13 22:27:59 2019 +0000

    libstdc++: Rename disable_sized_sentinel [P1871R1]
    
            * include/bits/iterator_concepts.h (disable_sized_sentinel): Rename to
            disable_sized_sentinel_for.
            * testsuite/24_iterators/headers/iterator/synopsis_c++20.cc: Adjust.

diff --git a/libstdc++-v3/include/bits/iterator_concepts.h b/libstdc++-v3/include/bits/iterator_concepts.h
index 8b398616a56..7cc058eb8c9 100644
--- a/libstdc++-v3/include/bits/iterator_concepts.h
+++ b/libstdc++-v3/include/bits/iterator_concepts.h
@@ -524,11 +524,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       && __detail::__weakly_eq_cmp_with<_Sent, _Iter>;
 
   template<typename _Sent, typename _Iter>
-    inline constexpr bool disable_sized_sentinel = false;
+    inline constexpr bool disable_sized_sentinel_for = false;
 
   template<typename _Sent, typename _Iter>
     concept sized_sentinel_for = sentinel_for<_Sent, _Iter>
-    && !disable_sized_sentinel<remove_cv_t<_Sent>, remove_cv_t<_Iter>>
+    && !disable_sized_sentinel_for<remove_cv_t<_Sent>, remove_cv_t<_Iter>>
     && requires(const _Iter& __i, const _Sent& __s)
     {
       { __s - __i } -> same_as<iter_difference_t<_Iter>>;
diff --git a/libstdc++-v3/include/bits/stl_iterator.h b/libstdc++-v3/include/bits/stl_iterator.h
index 411feba90e0..a707621c9ed 100644
--- a/libstdc++-v3/include/bits/stl_iterator.h
+++ b/libstdc++-v3/include/bits/stl_iterator.h
@@ -449,9 +449,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #  if __cplusplus > 201703L && defined __cpp_lib_concepts
   template<typename _Iterator1, typename _Iterator2>
     requires (!sized_sentinel_for<_Iterator1, _Iterator2>)
-    inline constexpr bool disable_sized_sentinel<reverse_iterator<_Iterator1>,
-						 reverse_iterator<_Iterator2>>
-						   = true;
+    inline constexpr bool
+    disable_sized_sentinel_for<reverse_iterator<_Iterator1>,
+			       reverse_iterator<_Iterator2>> = true;
 #  endif // C++20
 # endif // C++14
 
diff --git a/libstdc++-v3/testsuite/24_iterators/headers/iterator/synopsis_c++20.cc b/libstdc++-v3/testsuite/24_iterators/headers/iterator/synopsis_c++20.cc
index 824b0b4f38c..fb3bb420a54 100644
--- a/libstdc++-v3/testsuite/24_iterators/headers/iterator/synopsis_c++20.cc
+++ b/libstdc++-v3/testsuite/24_iterators/headers/iterator/synopsis_c++20.cc
@@ -79,7 +79,7 @@ namespace std
 }
 
 struct I { };
-template<> constexpr bool std::disable_sized_sentinel<I, I> = true;
+template<> constexpr bool std::disable_sized_sentinel_for<I, I> = true;
 
 namespace __gnu_test
 {
@@ -87,8 +87,8 @@ namespace __gnu_test
   constexpr auto* iter_move = &std::ranges::iter_move;
   constexpr auto* iter_swap = &std::ranges::iter_swap;
   // sized sentinels
-  constexpr bool const* disable_sized_sentinel
-    = &std::disable_sized_sentinel<void, void>;
+  constexpr bool const* disable_sized_sentinel_for
+    = &std::disable_sized_sentinel_for<void, void>;
   // default sentinels
   constexpr std::default_sentinel_t const* default_sentinel
     = &std::default_sentinel;