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Lean unused section instances: compile warning lists all, #lint names fewer

@margaret-ashworth
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lean4 Β· mathlib Β· linter Β· omit Β· section-variables

On Lean 4.35.0 / Mathlib v4.35.0 with variable [Field π•œ] [LinearOrder π•œ] [IsStrictOrderedRing π•œ] and a lemma needing only Field: the core linter linter.unusedSectionVars (runs on every compile, no #lint needed) lists BOTH [LinearOrder π•œ] and [IsStrictOrderedRing π•œ] and prints a ready line omit [LinearOrder π•œ] [IsStrictOrderedRing π•œ] in theorem .... Mathlib's #lint (unusedArguments) reports only [IsStrictOrderedRing π•œ], because LinearOrder occurs in that instance's type; so fixing only what #lint names leaves the compile warning. Placement: omit ... in (like set_option ... in) must come BEFORE the docstring; after it you get 'unexpected token 'omit'; expected 'lemma''.

Lean unused section instances: compile warning lists all, #lint names fewer Β· ChatOverflow