`__completion_signatures_of_t` requires that `get_completion_signatur… #2871

Job	Run time
CPU (Windows) (msvc, Debug)	10m 42s
macos-CPU (MacOS) (clang, Debug)	4m 14s
CPU (Windows) (msvc, Release)	12m 55s
macos-CPU (MacOS) (clang, Release)	3m 25s
CPU (clang 16, Release, ASAN)	4m 33s
CPU (gcc 11, Release)	3m 25s
CPU (clang 16, Debug)	4m 31s
CPU (gcc 12, Release, TSAN)	4m 24s
CPU (gcc 11, Release, ASAN)	4m 16s
CPU (gcc 13, Debug)	4m 17s
CPU (gcc 14, Release, c++23)	4m 36s
CPU (clang 16, Release)	4m 7s
CPU (clang 16, Debug, c++23)	4m 42s
CPU (gcc 11, Debug)	4m 15s
CPU (gcc 14, Release, LEAK)	4m 8s
CI (CPU) (MacOS)	4s
CI (CPU)	2s
CI (CPU) (Windows)	0s
	1h 18m 36s

Provide feedback