Expose bindings in _: {} blocks #407

Job	Run time
fmt	12s
readme	1m 14s
docs	16s
clippy	55s
nightly/--features default test --doc	2m 14s
nightly/test --all-targets	2m 3s
nightly/check --all-targets	1m 55s
beta/test --all-targets	2m 7s
beta/check --all-targets	2m 1s
miri ()	1m 51s
os-check (macos-latest)	1m 31s
miri (-Zmiri-tree-borrows)	1m 56s
miri (-Zmiri-tree-borrows -Zmiri-strict-provenance)	1m 54s
os-check (windows-latest)	3m 28s
miri (-Zmiri-strict-provenance)	1m 22s
ui-tests	1m 29s
sanitizers (--all-targets)	50s
link-heartbeat	32s
signed-off-by	7s
msrv/check	3m 13s
beta/--features default test --doc	1m 46s
nightly-msrv	2m 10s
sanitizers (--doc)	1s
msrv/test	4m 51s
apply	54s
update	1m 31s
	42m 23s

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