[ghc-steering-committee] Underscores in numbers proposal

[Iavor Diatchki]

I am fine with this.  Related to our recent discussion: we should probably
require that this be protected by a language extension, like all other
literal notations.  Perhaps `UnderscoreLiterals`?

-Iavor

PS:  technically, this is not backward compatible :-)  Here is an example:

    instance Num b => Num (a -> b) where
      fromInteger = const . fromInteger

    test :: Integer
    test = 1_1
      where _1 = 2

Currently this evaluates to 1, but with the extension it will evaluate to
11.  I don't think that any real code would be affected by this, I just had
a bit of fun writing it.





On Wed, Nov 1, 2017 at 2:33 PM Christopher Allen <cma at bitemyapp.com> wrote:

>
> https://github.com/ghc-proposals/ghc-proposals/pull/76#issuecomment-339952996
>
> This appears to have near universal approval. It's certainly a feature
> I've been grateful for when writing Rust code. I wasn't able to find a
> thread about this proposal in my email archives, so I apologize if
> this was redundant.
>
> Could this be moved to a decision soon?
>
> Thank you,
> Chris Allen
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