100644 blob 15140014a093e5a8cf9c3ed2ae994f6c8a037fdb	constexpr.cc
100644 blob c5aee2256c0f9458d2f4bb5b6e843a5b5e94aad8	constrained.cc
100644 blob 4372a7443f2a39c08fcf16246cc677aaf41d118a	moveable.cc
040000 tree d8149b928331c5c3280cb378f50ae983074611f2	requirements