[ new ] System.Concurrency.(Linear/Session) (#3294) #686

Job	Run time
initialise	6s
quick-check	23s
ubuntu-bootstrap-chez	1s
ubuntu-bootstrap-racket	1s
nix-bootstrap-chez	1s
macos-bootstrap-chez	1s
ubuntu-self-host-previous-version	1s
windows-bootstrap-chez	1s
ub-pack-test-pack	1s
ub-pack-test-lsp	1s
macos-self-host-chez	1s
ub-test-collie	1s
ub-test-frex	1s
ub-test-elab-util	1s
ub-test-katla-and-html	1s
ubuntu-build-api	1s
ubuntu-self-host-chez	1s
ubuntu-self-host-racket	1s
windows-self-host-racket	1s
	46s

Provide feedback