Haskell in Production

Re:Haskell in Production by ppseafield on Thursday October 17, 2019 @08:36PM (#21287646)

Maybe just one extra line like this?

    Prelude> print 2 + 3

    <interactive>:3:1: error:
        • No instance for (Num (IO ())) arising from a use of ‘+’
        • The expression `print 2` :: IO ()
        • In the expression: print 2 + 3
          In an equation for ‘it’: it = print 2 + 3

Just adding the one line telling telling you what was `IO ()` is helpful. ghci obviously knows what it was here.

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Re:Haskell in Production by sullyj3 on Thursday October 17, 2019 @11:54PM (#21288515)

This suggestion is a straightforward, easy to implement improvement. Many compilers have serious UX problems because their authors don't take UX seriously. Elm and Rust are two languages getting this right.

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