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Second, as aid in design. I had the pleasure to use languages capable of deriving implementations from types directly (where otherwise you'd use reflection) and ones with type-directed search and typed-holes (even though unsafeCoerce fitting every hole is a bit annoying :)



What language was this?


Sounds very much like Haskell. The search engine is Hoogle.

https://www.haskell.org/hoogle/


Haskell and Purescript (a close-relative compiled to Javascript). Have yet to 'use it in anger', though :)




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