Can anyone tell me what's wrong with this?
-- ghc -fglasgow-exts -c TH.hs
module TH where
{
import Language.Haskell.THSyntax;
class HasZero a where
{
zero :: a;
};
aninstance :: TypQ -> Q [Dec];
aninstance t = [d|
instance HasZero $t where -- error here
{
zero = 0;
};
|];
$(aninstance [t|Int|])
$(aninstance [t|Integer|])
}
$ ghc -fglasgow-exts -c TH.hs
TH.hs:14: Malformed context in instance header
All I want to do is spin off a number instances for a number of types...
--
Ashley Yakeley, Seattle WA
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