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 <simo...@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-boun...@haskell.org] *On Behalf Of *Johan > Tibell > *Sent:* 22 September 2014 14:28 > *To:* Alexander Berntsen > *Cc:* ghc-devs@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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