[Merged by Bors] - Optional .system()
, part 4 (run criteria)
#2431
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Objective
.system
#2398 and friends..system()
optional in run criteria APIs.Solution
RunCriteriaDescriptorCoercion
signature and implementors.IntoRunCriteria
forIntoSystem
rather thanSystem
..system()
with run criteria in tests ofstage.rs
, to verify the implementation.