d4f10bc07e
To prevent user confusion as in this [Zulip message](https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Matching.20on.20prop/near/341456011)
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invalidMutualError.lean:8:0-17:3: error: invalid mutual block: either all elements of the block must be inductive declarations, or they must all be definitions/theorems/abbrevs
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