this post was submitted on 01 Nov 2023
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[โ€“] kronicmage@lemmy.ca 23 points 1 year ago (1 children)

This is referencing Philip Wadler's 1989 paper "Theorems for Free", which is fairly well known in the Haskell community: https://home.ttic.edu/~dreyer/course/papers/wadler.pdf

[โ€“] spicyemu@programming.dev 3 points 1 year ago

That looks like something I've seen somewhere and didn't understand.