This is a forbidden name that shows up as a false positive when I grep
for uses of _T in the headers. Change it to just 'T'.

libstdc++-v3/ChangeLog:

        * include/bits/regex.h (basic_regex::assign(I, I, * flag_type)):
        Tweak comment to use T instead of _T.
---

Pushed to trunk.

 libstdc++-v3/include/bits/regex.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/bits/regex.h 
b/libstdc++-v3/include/bits/regex.h
index dce420251db0..92aa6ec2210b 100644
--- a/libstdc++-v3/include/bits/regex.h
+++ b/libstdc++-v3/include/bits/regex.h
@@ -733,7 +733,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
              __glibcxx_requires_valid_range(__first, __last);
              if constexpr (is_pointer_v<_InputIterator>)
                _M_compile(__first, __last, __flags);
-             else // __normal_iterator<_T*, C>
+             else // __normal_iterator<T*, C>
                _M_compile(__first.base(), __last.base(), __flags);
            }
          else
-- 
2.56.0

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