[Haskell-cafe] Re: Is 78 characters still a good option? Was: breaking too long lines

Xiao-Yong Jin wrote:

Gwern Branwen writes:

...

I was cabalizing a package once, and I chucked into the build-depends 'ghc' and made it build. About 30 seconds later, it occurred to me that this was a geometry library and what the heck was it doing with the GHC API? So I go looking, and I find a module of utility functions. It's importing GHC.Base. I remove the import and scroll down to see the error.

It turns out that 20 megabytes of GHC code was being linked into this program for one function. I took the quick way out and typed into the module: 'isJust Nothing = False; isJust (Just a) = True'.

Probably I'm missing something, but why didn't you just import Data.Maybe? I believe both 'isJust' and 'isNothing' is defined in the module.

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