040000 tree 10275669c6c6165627b95a456b296ec80da51889	assignment
040000 tree 5d28a3a69a0ad9028b23e4b4aeb82aefc5e8daca	cons
040000 tree 4fdf697aa793712a911083600477b00aeaddfa44	constexpr
100644 blob 66525b27af49f58a4f97e59c5ff612cbae66bb4f	in_place.cc
100644 blob 99122c01839914ac3af682fc727943cf3f8c94e7	make_optional.cc
100644 blob 560579791140540a83884b82546e6975a0e059b7	nullopt.cc
040000 tree 5a7ab3337340158041d8f13a8fa4f20d9cffc1d4	observers
040000 tree 0ef2509b02d13123d707cda8c9a4fd8aac294d9b	relops
100644 blob 4b0535b4709390f330fe264f32b5bdc02188b358	requirements.cc
040000 tree b29aac2defa8d9ce156868ba6b74992926e9e3df	swap