[committed] libstdc++: Add comment to #include in <variant>

[Jonathan Wakely]

Tested x86_64-linux. Pushed to trunk.

-- >8 --

It's not obvious why <variant> needs <bits/parse_numbers.h> so add a
comment to it.

libstdc++-v3/ChangeLog:

	* include/std/variant: Add comment to #include.
---
 libstdc++-v3/include/std/variant | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/std/variant b/libstdc++-v3/include/std/variant
index f79d95db7a8..748e9bae1cb 100644
--- a/libstdc++-v3/include/std/variant
+++ b/libstdc++-v3/include/std/variant
@@ -42,7 +42,7 @@
 #include <bits/exception_defines.h>
 #include <bits/functional_hash.h>
 #include <bits/invoke.h>
-#include <bits/parse_numbers.h>
+#include <bits/parse_numbers.h> // _Select_int
 #include <bits/stl_iterator_base_funcs.h>
 #include <bits/stl_construct.h>
 #include <bits/utility.h> // in_place_index_t
-- 
2.44.0