[Haskell-cafe] FIXME pragma

[Christopher Done]

I found WARNING fell short because it doesn't work on module-local
definitions, and only triggers on use.

On 18 May 2015 at 08:25, Zilin Chen <zilinc.dev at gmail.com> wrote:

>  I also wanted such a feature but eventually I just went with:
>
> __todo :: String -> a
> {-# WARNING __todo "TODO" #-}
> __todo msg = error $ "TODO: " ++ msg
>
> __fixme :: a -> a
> {-# WARNING __fixme "FIXME" #-}
> __fixme = id
>
> Cheers,
> Zilin
>
> On 18/05/15 12:47, Richard Eisenberg wrote:
>
> -1
>
> I like the idea of having GHC spit out warnings and such of this form, but this is so straightforward to do with Template Haskell:
>
> $([] <$ reportWarning "Fix this function!")
>
> You could do something similar in terms, spitting out `id` instead of an empty list of declarations. (You'd have to be careful where you do this, admittedly.)
>
> If it's this easy to do in userland without affecting the compiler, let's do it that way. And, even better, with some library support, you could customize this behavior in all sorts of ways.
>
> Richard
>
> On May 17, 2015, at 4:10 PM, Roman Cheplyaka <roma at ro-che.info> <roma at ro-che.info> wrote:
>
>
>  On 17/05/15 19:42, Christopher Done wrote:
>
>  What's the feeling on having a FIXME pragma so that I can attach
> warnings to unfinished things?
>
> |{-# FIXME foo "Reasons here." #-}|
>
> I would use the WARNING pragma but that doesn't work within a module and
> only triggers on use. Compiler errors are the one thing I and everyone
> else pays attention to, it would be very handy to have more control over
> things GHC reports to the developer to aid development.
>
>  +1. I actively use WARNING in such cases, and I'd prefer the warning to
> be reported at the definition site.
>
> It'd also be great to allow this pragma anywhere in the code, but I
> realize it'd complicate the parser.
>
> Roman
>
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