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

[Stephan Bergmann via Gcc-patches]

On 11/21/22 21:43, Jonathan Wakely via Libstdc++ wrote:
+       static constexpr bool __is_unsigned
+         = __and_v<is_integral<typename _Duration::rep>,
+                   is_unsigned<typename _Duration::rep>>;

Using `__is_unsigned` as an identifier here causes compilation issues 
with Clang, which predefines that as a builtin predicate.