mathlib

94285983 - feat(tactic/rcases): add `rintro (x y : t)` support (#4722)

feat(tactic/rcases): add `rintro (x y : t)` support (#4722) As requested on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/rintros/near/213999254