[Merged by Bors] - chore: clean up more unused Decidable* instances in types#31934
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thorimur wants to merge 2 commits intoleanprover-community:masterfrom
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[Merged by Bors] - chore: clean up more unused Decidable* instances in types#31934thorimur wants to merge 2 commits intoleanprover-community:masterfrom
Decidable* instances in types#31934thorimur wants to merge 2 commits intoleanprover-community:masterfrom
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PR summary b3cf7a02d3Import changes for modified filesNo significant changes to the import graph Import changes for all files
Declarations diffNo declarations were harmed in the making of this PR! 🐙 You can run this locally as follows## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>
## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>The doc-module for No changes to technical debt.You can run this locally as
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Decidable* instances in typesDecidable* instances in types
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This PR turns on the `unusedDecidableInType` syntax linter (#31142) after fixing the remaining violations in #31831, #31934, and #32153. This also imports the linter into Mathlib.Init and adds the linter to the Mathlib standard set. Given that classicality is embedded in Lean, this is probably the behavior downstream repos who use the mathlib standard set want; if they are specifically constructive repos, the linter can always be turned off in the lakefile. We exempt the entirety of [Mathlib/Data/Fintype/Quotient.lean](https://github.com/leanprover-community/mathlib4/pull/31747/files#diff-9591d2f3828bee189ea954bc33586ce451536bf00792362f7cdca4f5a8551207), [Mathlib/Order/Heyting/Regular.lean](https://github.com/leanprover-community/mathlib4/pull/31747/files#diff-af85d99e5d2f5561fe837f662f179c58f1ebe2a4ed0432a15260199883850c50), [Mathlib/Logic/Encodable/Basic.lean](https://github.com/leanprover-community/mathlib4/pull/31747/files#diff-db01c9a2d4726fe7ca0e6eb18a7cd485b5a9c6b26ba422dfbe501dcebef3cf77) and a declaration in [Mathlib/Computability/Halting.lean](https://github.com/leanprover-community/mathlib4/pull/31747/files#diff-d47323ee8b4b2321052b4be93715f8b2f3f840f76ec441d8bf75c834b8665b32) since constructivity is desired there. We also exempt `dec_em'`, which is a variant of `Decidable.em` but with the disjuncts reversed. Many prior violations have already been fixed through the use of #10235, hence the small number of violations picked up by the syntax linter. Co-authored-by: thorimur <thomasmurrills@gmail.com> Co-authored-by: Michael Rothgang <rothgang@math.uni-bonn.de>
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…lib4 * 'master' of https://github.com/leanprover-community/mathlib4: (3130 commits) feat(SetTheory/ZFC): add `ZFSet.card` (leanprover-community#29365) feat: grind annotations for `choose_spec` (leanprover-community#31927) chore(scripts): update nolints.json (leanprover-community#31975) feat(Analysis): cos (n * π) = (-1) ^ n (leanprover-community#31971) chore: rename `mul_le_mul_right'` to `mul_le_mul_left` (leanprover-community#30242) chore: update Mathlib dependencies 2025-11-22 (leanprover-community#31955) feat(MeasureTheory): ae-measurability notation wrt non-standard sigma-algebra (leanprover-community#31910) doc: add missing spaces around doc code blocks (leanprover-community#31917) chore: update Mathlib dependencies 2025-11-22 (leanprover-community#31945) chore: shortcut instance for `Nat` to be mul-torsion-free (leanprover-community#31027) doc(Topology/Algebra/Algebra): outdated TODO (leanprover-community#31944) feat(EqHaar): add `addHaar_nnreal_smul` (leanprover-community#31922) chore(Algebra): make invertibleInv an instance (leanprover-community#31916) chore(Algebra): change two statements in CubicDiscriminant (leanprover-community#31912) chore(MeasureTheory): mark `map_dirac` as simp (leanprover-community#31909) feat: `LinearOrder` instance for `Empty` (leanprover-community#31889) chore: deprecate all remaining modules in `Analysis/NormedSpace` (leanprover-community#31913) feat(SimpleGraph): weaker condition for paths in acyclic graphs (leanprover-community#25814) chore: do not set `group` when declaring option (leanprover-community#31888) chore: clean up more unused `Decidable*` instances in types (leanprover-community#31934) ...
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Found by #10235 and #31142.