Annotations

[Johan Tibell]

I agree. I would like a warning if I use {-# ANN ... #-} without the
language pragma. I clearly meant to write an annotation!


On Wed, Nov 6, 2013 at 11:55 AM, Simon Peyton-Jones
<simonpj at microsoft.com>wrote:

>  I’ve just noticed that there is no GHC language extension for annotations
>
>
> http://www.haskell.org/ghc/docs/latest/html/users_guide/extending-ghc.html#annotation-pragmas
>
> That feels like an oversight. Yes, they are in a pragma, but you may get
> an error message if you compile with a stage-1 compiler, for example.
> Plus, the language extensions should truthfully report what extra stuff you
> are using.
>
>
>
> I’m inclined to add a language extension “Annotations”.
>
> ·         Without it {-# ANN … #-} pragmas are ignored as comments
>
> ·         With it, they are treated as annotations
>
> Do you agree?
>
> I don’t know whether this can (or even should) land in 7.8.1.  Do you care
> either way?
>
> Guidance welcome
>
> Simon
>
>
>
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