| -- Hugs allows this. GHC rejects it on the grounds that a is unused
| -- on the right-hand side of the (=). I think this is arguably a bug
| -- in GHC.
| f3 :: (Show a, ?foo :: a) = String
| f3 = show ?foo
Hugs is right here. GHC 6.8 accepts this too, and has done for some time;
there's
G'day all.
Quoting Simon Peyton-Jones [EMAIL PROTECTED]:
| -- GHC rejects this. Hugs compiles it, but I can't call it as
| -- let ?foo = Hello in show Foo
| --
| -- Is there a good reason to disallow this?
| data Foo = Foo
|
| instance (?foo :: String) = Show Foo where
| showsPrec _ Foo =
On Thu, Sep 06, 2007 at 06:49:21AM -0400, [EMAIL PROTECTED] wrote:
For completeness, here's the final solution, courtesy of int-e (whose
real name I don't know; sorry), which is much more elegant than I
Bertram Felgenhauer
bindString :: (forall s. StringAsType s = Mark s a) - String - a
