5cd9f805b7
this is an amendment to #4177, after @kmill pointed out an issue: Users might expect that within a tactic combinator like `first`, `simp [h]` fails if `h` does not exist. Therefore the behavior introduced in PR #4177, which is really most useful in mormal interactive use of `skip`, is restricted to when `recover := true`.
179 lines
9.5 KiB
Text
179 lines
9.5 KiB
Text
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"```lean\nt a n✝ : Nat\na✝ : t * (a + n✝) = t * a + t * n✝\n⊢ t * (a + n✝) + t = t * a + t * (n✝ + 1)\n```\n---\n```lean\nt a n✝ : Nat\na✝ : t * (a + n✝) = t * a + t * n✝\n⊢ t * (a + n✝) + t = t * a + (t * n✝ + t)\n```\n---\n```lean\nt a n✝ : Nat\na✝ : t * (a + n✝) = t * a + t * n✝\n⊢ t * (a + n✝) + t = t * a + (t * n✝ + t)\n```",
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