prove twist hexagon in twist construction #3919

Job	Run time
build (supported)	3m 36s
build (latest)	3m 35s
build (dev, --warnings)	3m 49s
opam-build (dev, ubuntu-latest)	4m 10s
opam-build (supported, ubuntu-latest)	4m 48s
nix	2m 14s
quick-build (latest, ubuntu-latest)	3m 22s
quick-build (supported, ubuntu-latest)	3m 33s
opam-build (latest, ubuntu-latest)	4m 35s
quick-build (dev, ubuntu-latest)	3m 12s
doc-dep-graphs	7m 5s
doc-alectryon	13m 57s
coqchk (dev)	2m 6s
coqchk (latest)	2m 10s
doc-coqdoc	1m 44s
coqchk (supported)	2m 22s
install (latest)	1m 43s
doc-timing	1m 46s
install (supported)	1m 43s
install (dev)	1m 47s
deploy-doc	0s
delete-artifacts	8s
	1h 13m 25s

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