Hi Fons, On Mon, Oct 29, 2007 at 12:31:07PM +0100, Alfonso Acosta wrote:
I'm a bit confused about TupleT . Is is supposed to be only used when synthesizing types? (i.e. reify will never output such a type)?
Quasiquotes produce it: Prelude Language.Haskell.TH> $( do t <- [t| (Int, Bool) |]; runIO $ print t; [| 1 |] ) AppT (AppT (TupleT 2) (ConT GHC.Base.Int)) (ConT GHC.Base.Bool)
Should this be considered a bug or a feature? IMHO it's quite ugly to have two valid representations for the same type in the same AST structure.
I wouldn't be opposed to removing it (in fact, I think there is a general feeling that lots of redundancies in the TH syntax should be removed, e.g. the subthread starting with http://www.haskell.org/pipermail/template-haskell/2006-August/000572.html but no-one has yet taken the lead and proposed something). Thanks Ian