6514385bb9
This adds the ability to add the converse direction of a rewrite rule not just in simp arguments `simp [← thm]`, but also as a global attribute ```lean attribute [simp ←] thm ``` This fixes #5828. This can be undone with `attribute [-simp]`, although note that `[-simp]` wins and cannot be undone at the moment (#5868). Like `simp [← thm]` (see #4290), this will do an implicit `attribute [-simp] thm` if the other direction is already defined. |
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| stdlib | ||