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It's interesting he discusses Liquid Haskell (proofs via refinement types) extensively:

"So, for me, that’s as far as increasing our ability to give you statically guaranteed theorems about Haskell programs.

My money’s on Liquid Haskell at the moment and I hope that we the Haskell community"

My experience is that other refinement type systems are way less complex. See: https://github.com/hwayne/lets-prove-leftpad

In particular, compare https://github.com/hwayne/lets-prove-leftpad/blob/master/liq... to https://github.com/hwayne/lets-prove-leftpad/blob/master/daf...

For me this has been a bit of a disappointment.



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