Merge pull request #3401 from buzden/fixity-in-do #945

Job	Run time
initialise	8s
quick-check	12m 46s
macos-bootstrap-chez	7m 23s
nix-bootstrap-chez	20m 45s
ubuntu-bootstrap-chez	7m 11s
ubuntu-bootstrap-racket	12m 23s
ubuntu-self-host-previous-version	10m 39s
windows-bootstrap-chez	23m 4s
ubuntu-self-host-chez	10m 32s
ubuntu-build-api	4m 9s
macos-self-host-chez	25m 34s
ub-pack-test-pack	11m 59s
ub-test-frex	3m 54s
ub-test-collie	22s
ub-pack-test-lsp	14m 41s
ub-test-elab-util	38s
ub-test-katla-and-html	6m 10s
ubuntu-self-host-racket	0s
windows-self-host-racket	10m 42s
	3h 3m 0s

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