Warning suppression pragmas

[Эдгар Жаворонков]

Hi Ben!

I concreted some points in local warnings suppression pragmas wiki page
with specification.
https://ghc.haskell.org/trac/ghc/wiki/Design/LocalWarningPragmas
Do you know something about defining custom pragmas in GHC?
I suppose, i need to add it to the lexer and parser.
In that case, how can i understand, that GHC recognizes my pragma?
I want to try a few things on my local machine

Thanks in advance!
Cheers!

---
С уважением,
Жаворонков Эдгар

Best regards,
Edgar A. Zhavoronkov

2015-10-27 2:35 GMT+03:00 Howard B. Golden <howard_b_golden at yahoo.com>:

> On US TV, Archie Bunker said "Stifle!"
>
> Howard
>
> > On Oct 26, 2015, at 1:59 PM, Alexey Shmalko <rasen.dubi at gmail.com>
> wrote:
> >
> > Hi!
> >
> > I think SUPPRESS could be enough.
> >
> > Hope this helps
> >
> > On Mon, Oct 26, 2015 at 8:59 PM, Эдгар Жаворонков
> > <edzhavoronkov at gmail.com> wrote:
> >> Hi Ben!
> >> Thanks for your feedback
> >> I thought a little and fixed some in wiki page
> >>
> >> In my opinion SUPPRESS_WARNINGS is not a real long name for pragma, but
> i
> >> can't come up with whort name that clearly describes purpose of such
> pragma
> >> =(
> >> Your suggestions are really welcome)
> >>
> >> ---
> >> С уважением,
> >> Жаворонков Эдгар
> >>
> >> Best regards,
> >> Edgar A. Zhavoronkov
> >>
> >> 2015-10-26 19:45 GMT+03:00 Ben Gamari <ben at well-typed.com>:
> >>>
> >>> Эдгар Жаворонков <edzhavoronkov at gmail.com> writes:
> >>>
> >>>> Hello Richard!
> >>>>
> >>>> Can you take a look at some sort of specification i wrote week ago?
> >>>> I placed it here:
> >>>> https://ghc.haskell.org/trac/ghc/wiki/Design/LocalWarningPragmas
> >>>> I can imagine only two use cases, and i'm not sure about correcteness
> of
> >>>> it
> >>> Thanks for writing this up!
> >>>
> >>> The specification is a good start but it really needs more detail. For
> >>> instance, what syntactic elements do you want this pragma to apply to?
> >>> Bindings? Expressions? Top-level definitions like classes, types, and
> >>> instances? Any lexical scope?
> >>>
> >>> It would be nice if the use-cases you mention were a bit more concrete.
> >>> It wouldn't hurt to mention particular warnings that you might imagine
> >>> that this would be useful for.
> >>>
> >>> It would likely be useful to draw inspiration from some of the schemes
> >>> used by other languages listed on the ticket (Rust and C# IIRC). It
> >>> wouldn't hurt to draw attention to the similarities and differences to
> >>> these other schemes in the proposal text.
> >>>
> >>> On a more bike-shed-y note, `SUPPRESS_WARNINGS` is arguably a bit on
> the
> >>> long side.
> >>>
> >>> Personally I would prefer not to see the pragma be bracketed as you
> >>> propose in your last example as its effect then becomes quite
> >>> "non-local". This pragma should, in my opinion, be a tool of precision,
> >>> used sparingly for well-understood reasons. Allowing bracketed regions
> >>> makes it too easy for definitions to "sneak in" to the supressed
> region,
> >>> hiding legitimate warnings. In the interest of keeping the proposal
> >>> concrete and concise I would either remove this alternative or move it
> >>> to a dedicated "Alternatives" section.
> >>>
> >>> I'm looking forward to seeing what becomes of this. You might consider
> >>> submitting the next iteration of the proposal to the Haskell subreddit
> >>> to get a few more eyes on it. Onwards!
> >>>
> >>> Cheers,
> >>>
> >>> - Ben
> >>
> >>
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