[Haskell-beginners] GHC warnings

[Patrick Mylund Nielsen]

It's hlint: http://community.haskell.org/~ndm/hlint/

e.g.:

# sudo apt-get install hlint
# hlint src

(where src is the folder containing Haskell files)

or

# hlint src --report

to generate an HTML report.


On Sat, Feb 23, 2013 at 10:25 PM, Emanuel Koczwara <
poczta at emanuelkoczwara.pl> wrote:

> Hi,
>
>   Why GHC doesn't tell me such things like hpaste? (example here:
> http://hpaste.org/82917)
>
> 27:12: Error: Use replicateM
> Found:
>   sequence $ replicate gridSize getLine
> Why not:
>   Control.Monad.replicateM gridSize getLine
>
>
> 50:14: Warning: Use list comprehension
> Found:
>   if y > 0 then [(UP, (x, y - 1))] else []
> Why not:
>   [(UP, (x, y - 1)) | y > 0]
>
>
> 81:1: Error: Eta reduce
> Found:
>   sortByPathCost p ps = sortBy compareHeuristic ps
> Why not:
>   sortByPathCost p = sortBy compareHeuristic
>
>
>   Can I enable this kind of verbosity in GHC somehow?
>
> Emanuel
>
>
>
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