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[Merged by Bors] - fix(data/set/function): do not use reducible #12377
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See also leanprover-community/mathport#118 |
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Reducible should only be used if the definition if it occurs as an explicit argument in a type class and must reduce during type class search, or if it is a type that should inherit instances. Propositions should only be reducible if they are trivial variants (`<` and `>` for example). These reducible attributes here will cause issues in Lean 4. In Lean 4, the simplifier unfold reducible definitions in simp lemmas. This means that tagging an `inj_on`-theorem with `@[simp]` creates the simp lemma `?a = ?b` (i.e. match anything).
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Reducible should only be used if the definition if it occurs as an explicit argument in a type class and must reduce during type class search, or if it is a type that should inherit instances. Propositions should only be reducible if they are trivial variants (
<and>for example).These reducible attributes here will cause issues in Lean 4. In Lean 4, the simplifier unfold reducible definitions in simp lemmas. This means that tagging an
inj_on-theorem with@[simp]creates the simp lemma?a = ?b(i.e. match anything).