At 21:40 22/11/04 +0100, Ralf Laemmel wrote:
Instance selection and thereby overlapping resolution
is *independent* of constraints. It is defined to be purely
syntactical in terms of instance heads. See the HList paper
for some weird examples.
That explains it. Thanks!
#g
--
Ralf
Graham Klyne wrote:
The reported overlapping instance is [Char], which I take to be derived
from the type constructor [] applied to type Char, this yielding a form
that matches (cw c). But the instance ConceptExpr (cw c) is declared to
be dependent on the context ConceptWrapper cw c, which has *not* been
declared for the type constructor [].
GHCi with -fglasgow-exts is no more informative.
What am I missing here?
------------
Graham Klyne
For email:
http://www.ninebynine.org/#Contact
_______________________________________________
Haskell-Cafe mailing list
[EMAIL PROTECTED]
http://www.haskell.org/mailman/listinfo/haskell-cafe
