[PATCH] libstdc++: Make chrono::hh_mm_ss more compact

[Stephan Bergmann]

On 12/12/2022 12:18, Jonathan Wakely wrote:
> If Clang already treats __is_signed as a conditionally-active
> built-in, it should do the same for __is_unsigned.

Wasn't aware of that special handling of __is_signed.  Filed 
<https://reviews.llvm.org/D139847> "Also allow __is_unsigned to be used 
as an identifier" now (just in case, even if the use in libstdc++ is 
already gone again).