`MVarId.congr?` and `MVarId.hcongr?` should return `none` if an exception is thrown while applying congruence theorem. `MVarId.hcongr?` should try `eq_of_heq` before trying to apply `hcongr` theorem. closes #1787 BTW: Lean 4 `congr` tactic is applying `assumption`. Lean 3 version does not. |
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