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chore: update RELEASES.md

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Leonardo de Moura 2022-05-04 15:31:57 -07:00
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RELEASES.md
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Unreleased
---------
* `Option` is again a monad. The auxiliary type `OptionM` has been removed. See [Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/Do.20we.20still.20need.20OptionM.3F/near/279761084).
* Improve `split` tactic. It used to fail on `match` expressions of the form `match h : e with ...` where `e` is not a free variable.
The failure used to occur during generalization.