feat(tactic/obtain): make type argument optional #1327
Merged
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https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/obtain/near/173183243
obtain ⟨h, h2⟩ := and.intro trivial trivial
is equivalent torcases and.intro trivial trivial with ⟨h, h2⟩
, but I think there's no reason not to support it withobtain
as well.TO CONTRIBUTORS:
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