redefine Bifunctor #2268

Job	Run time
build (supported)	3m 11s
opam-build (supported, ubuntu-latest)	4m 35s
build (latest)	3m 13s
nix	2m 6s
quick-build (supported, ubuntu-latest)	2m 50s
opam-build (8.18, ubuntu-latest)	4m 35s
build (dev, --warnings)	3m 0s
quick-build (latest, ubuntu-latest)	2m 51s
opam-build (latest, ubuntu-latest)	4m 39s
quick-build (dev, ubuntu-latest)	2m 48s
opam-build (dev, ubuntu-latest)	4m 32s
doc-alectryon	13m 17s
doc-dep-graphs	7m 11s
doc-coqdoc	1m 5s
coqchk (supported)	1m 37s
doc-timing	1m 8s
install (supported)	1m 9s
coqchk (latest)	1m 35s
install (latest)	1m 10s
coqchk (dev)	1m 40s
install (dev)	1m 8s
deploy-doc	0s
delete-artifacts	3s
	1h 9m 23s

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