Permitting trailing commas for record syntax ADT declarations

[Johan Tibell]

Don't worry about supporting trailing/leading commas everywhere for now.
Have it work for records first. We can always add support in more places
later.

On Mon, Sep 22, 2014 at 9:07 PM, Simon Peyton Jones <simonpj at microsoft.com>
wrote:

>  I’m all for it.  To progress it you need to
>
> ·        open a Trac ticket,
>
> ·        start a wiki page to describe the design specifically (e.g give
> all the changed syntax rules)
>
> ·        have a language extension TrailingCommas (or something) to
> enable the extension
>
> ·        perhaps suggest switching on the extension if the program parses
> with it, but fails without
>
> ·        develop a patch
>
>
>
> Easy really!  I doubt it’s controversial.
>
>
> Simon
>
>
>
> *From:* ghc-devs [mailto:ghc-devs-bounces at haskell.org] *On Behalf Of *Johan
> Tibell
> *Sent:* 22 September 2014 14:28
> *To:* Alexander Berntsen
> *Cc:* ghc-devs at haskell.org
> *Subject:* Re: Permitting trailing commas for record syntax ADT
> declarations
>
>
>
> +1
>
>
>
> I think this makes sense and we should allow trailing commas wherever the
> syntax allows it without adding ambiguity (e.g. tuple sections prevent
> trailing commas for tuple declarations.)
>
>
>
> P.S. Last time we tried to discuss something like this (on libraries@ I
> believe) the whole discussion devolved into a "lets rewrite all of
> Haskell". Lets not do that here. Thanks!
>
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