From 95d404d85c53e4ab821ac28cbbbedf0d68cac8da Mon Sep 17 00:00:00 2001
From: Jonathan Wakely <jwakely@redhat.com>
Date: Wed, 15 Sep 2021 21:49:29 +0100
Subject: [PATCH] libstdc++: Add missing constraint to std::span deduction
 guide [PR102280]

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	PR libstdc++/102280
	* include/std/span (span(Range&&)): Add constraint to deduction
	guide.

(cherry picked from commit e67917f5df9d84f5aed3513b3931a82870d25135)
---
 libstdc++-v3/include/std/span | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/std/span b/libstdc++-v3/include/std/span
index b44e3b9e9c79..86fe042e7245 100644
--- a/libstdc++-v3/include/std/span
+++ b/libstdc++-v3/include/std/span
@@ -407,7 +407,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     span(_Iter, _End)
       -> span<remove_reference_t<iter_reference_t<_Iter>>>;
 
-  template<typename _Range>
+  template<ranges::contiguous_range _Range>
     span(_Range &&)
       -> span<remove_reference_t<ranges::range_reference_t<_Range&>>>;
 
-- 
2.47.2