Build

constexpr and decltype parsing #133

Job	Run time
macOS (11, 3.6, 5.9.*, release)	12m 40s
oldschool (centos, 7, python-debug, debug)	9m 55s
macOS (11, 3.6, 5.9.*, debug)	6m 45s
windows (win64_mingw73, 3.10, 5.12.*, x64)	5m 46s
oldschool (centos, 7, python-debug, release)	8m 7s
ubuntu (ubuntu:20.04)	14m 53s
macOS (12, 3.11, 5.12.*, debug)	5m 41s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	8m 6s
oldschool (rockylinux, 9, python3-devel, release)	9m 31s
ubuntu (ubuntu:22.04)	13m 15s
windows (win32_mingw53, 3.6, x86, 5.11.*)	9m 2s
	1h 43m 41s

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