[ refactor ] Make Data.Irrelevant.Irrelevant a proper Monad#2977
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jamesmckinna wants to merge 1 commit intoagda:masterfrom
Open
[ refactor ] Make Data.Irrelevant.Irrelevant a proper Monad#2977jamesmckinna wants to merge 1 commit intoagda:masterfrom
Data.Irrelevant.Irrelevant a proper Monad#2977jamesmckinna wants to merge 1 commit intoagda:masterfrom
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jamesmckinna
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Apr 12, 2026
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| _$∙⁺_ : (.A → B) → Irrelevant A → B | ||
| _$∙⁻_ : (Irrelevant A → B) → .A → B |
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Suggestions as to better names welcome!
MatthewDaggitt
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Apr 13, 2026
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This is prompted by this comment and @gallais 's introduction of the
λ∙operator which shifts irrelevant application to ordinary application. In some sense, this PR offers the converse operation, provided the codomain isIrrelevant.Rationale:
Data.Irrelevant._>>=_now has that of a 'proper' monadicbindoperator, which increases the range of its applicability wrt its type, but also permits the use ofdo-notation etc. downstreamDetails:
irrelevant-recomputemoves (asrecompute) toData.IrrelevantRelation.Nullary.RecomputableBadged as
v2.4, because AFAICT this is a backwards-compatible (if fiddly) change.Potential consequences: downstream, we can reconsider all (?) uses of the
.modality in favour of theIrrelevantmodality, and otherwise leave it encapsulated inData.Irrelevant?