[PATCH] libstdc++: Ensure <bits/ranges_util.h> defines __pair_like

[Jonathan Wakely]

We need to include <bits/stl_pair.h> in C++23 and later, so that
__pair_like_convertible_from can use __pair_like.

libstdc++-v3/ChangeLog:

	* include/bits/ranges_util.h: Include <bits/stl_pair.h>.
---

Very lightly tested on x86_64-linux.

I noticed this because I wanted to use ranges::subrange in a new header
which didn't include <bits/stl_pair.h>.

 libstdc++-v3/include/bits/ranges_util.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libstdc++-v3/include/bits/ranges_util.h b/libstdc++-v3/include/bits/ranges_util.h
index 51024ecbebe..d9039e75bf9 100644
--- a/libstdc++-v3/include/bits/ranges_util.h
+++ b/libstdc++-v3/include/bits/ranges_util.h
@@ -35,6 +35,9 @@
 # include <bits/utility.h>
 # include <bits/invoke.h>
 # include <bits/cpp_type_traits.h> // __can_use_memchr_for_find
+#if __glibcxx_tuple_like // >= C++23
+# include <bits/stl_pair.h> // __pair_like
+#endif
 
 #ifdef __glibcxx_ranges
 namespace std _GLIBCXX_VISIBILITY(default)
-- 
2.48.1