fix: apply? produces a non-synthetic sorry
#8231
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This PR changes the behaviour of `apply?` so that the `sorry` it uses to close the goal is non-synthetic. (Recall that correct use of synthetic sorries requires that the tactic also generates an error message, which we don't want to do in this situation.) Either this PR or #8230 are sufficient to defend against the problem reported in #8212. (cherry picked from commit 77b9e51)
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This PR changes the behaviour of `apply?` so that the `sorry` it uses to close the goal is non-synthetic. (Recall that correct use of synthetic sorries requires that the tactic also generates an error message, which we don't want to do in this situation.) Either this PR or #8230 are sufficient to defend against the problem reported in #8212. (cherry picked from commit 77b9e51)
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This PR changes the behaviour of
apply?so that thesorryit uses to close the goal is non-synthetic. (Recall that correct use of synthetic sorries requires that the tactic also generates an error message, which we don't want to do in this situation.) Either this PR or #8230 are sufficient to defend against the problem reported in #8212.