Add properties relating Vec.lookup to head and tail#3004
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jamesmckinna
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Jun 9, 2026
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Happy enough with things as they are here, but with some questions to at least consider.
Also: CHANGELOG
| lookup-head : lookup xs zero ≡ head xs | ||
| lookup-head {xs = x ∷ xs} = refl | ||
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| lookup-tail : ∀ {i} → lookup xs (suc i) ≡ lookup (tail xs) i |
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Should we maybe consider lifting i out as a variable declaration?
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I'm holding off adding a changelog for this and my other PRs until after 2.4 is released |
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Yeah, but this is such low-hanging fruit that it could easily be a v2.4 contribution? |
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We've already made a release candidate for v2.4 and I'm very reluctant to add anything else to it. |
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Really surprised these didn't already exist!