quotient by a trivial group #3223

Job	Run time
nix	2m 8s
build (supported)	2m 52s
opam-build (supported, ubuntu-latest)	4m 5s
quick-build (supported, ubuntu-latest)	2m 39s
build (latest)	2m 46s
opam-build (latest, ubuntu-latest)	4m 3s
quick-build (latest, ubuntu-latest)	2m 41s
build (dev, --warnings)	2m 52s
opam-build (dev, ubuntu-latest)	3m 38s
quick-build (dev, ubuntu-latest)	2m 43s
doc-alectryon	0s
coqchk	0s
doc-coqdoc	0s
doc-dep-graphs	0s
doc-timing	0s
install	0s
deploy-doc	0s
delete-artifacts	6s
	30m 33s

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