prove nat_div_div_r #2798

Job	Run time
opam-build (supported, ubuntu-latest)	4m 34s
opam-build (latest, ubuntu-latest)	4m 44s
nix	2m 7s
build (supported)	3m 21s
opam-build (dev, ubuntu-latest)	4m 19s
quick-build (supported, ubuntu-latest)	3m 11s
build (latest)	3m 13s
quick-build (latest, ubuntu-latest)	3m 9s
build (dev, --warnings)	3m 51s
quick-build (dev, ubuntu-latest)	3m 8s
doc-timing	1m 33s
doc-alectryon	14m 40s
doc-coqdoc	1m 27s
coqchk (supported)	2m 2s
doc-dep-graphs	7m 42s
coqchk (latest)	2m 7s
install (supported)	1m 41s
coqchk (dev)	1m 50s
install (latest)	1m 35s
install (dev)	1m 33s
deploy-doc	0s
delete-artifacts	4s
	1h 11m 51s

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