On 23/09/14 10:11, Alexander Berntsen wrote: > On 22/09/14 21:07, Simon Peyton Jones wrote: >> have a language extension TrailingCommas (or something) to enable >> the extension > For clarification: are you overruling the "do we sneak it in HEAD or > use pragma(s)"-vote and telling me to do the latter? > > If we can sneak it into HEAD (this is @ you Johan, too), I suggest > that someone applies my patches to make import and export lists > support leading commas (presently they only support trailing commas, > per the report) -- and following this I can just send a bunch of > "Permit leading/trailing ',' in Foo" patches to Phabricator, and you > guys can bikeshed over there about which ones you actually want to > commit. ;-) > > If I am to go down the pragma route, I guess I can make a > RudundantCommas pragma or something like that, that implements > trailing commas for imports/exports, and leading/trailing commas for > the suggestions in this thread. > > I'm +1 on the GHC HEAD route, but I'm not exactly violently opposed to > the pragma route either.
Here's my reasoning: If you invoke ghc with -XHaskell2010, then trailing commas shouldn't be accepted, because they do not belong to Haskell 2010. Which means that you do need an extension to identify this difference in behavior. Roman
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