fix: without recover bad simp arg should fail #4359
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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`.
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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 ifhdoes not exist. Therefore the behavior introduced inPR #4177, which is really most useful in mormal interactive use of
skip, is restricted to whenrecover := true.