Proposal to extend FieldPat in Template Haskell
simonpj at microsoft.com
Wed Jan 30 09:43:28 CET 2013
Fine with me! We need people to update TH.
We plan to release 7.8 in mid Feb, and then have a TH upheaval shortly thereafter (I hope). So let’s put this in afterwards.
From: glasgow-haskell-users-bounces at haskell.org [mailto:glasgow-haskell-users-bounces at haskell.org] On Behalf Of Iavor Diatchki
Sent: 29 January 2013 21:25
To: GHC Users Mailing List; Eric Mertens
Subject: Proposal to extend FieldPat in Template Haskell
(sorry for the repost, I forgot to add a subject.)
I was just doing some work with Template Haskell and I noticed that the AST does not have support for record puns and wild-cards. I know that these could be desugared into ordinary record patterns but I think that it would be more convenient for users (and also more consistent with the rest of the AST) if we provided direct support for them.
So I propose to change:
type FieldPat = (Name, Pat)
data FieldPat = RecordFileldP Name Pat -- x = P
| RecordPunP Name -- x
| RecordWildP -- ..
Would there be any objections to doing so? If not, I'd be happy to have a go at making the change.
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