Hi there,
When I compile the module below with ghc-4.01
and -fglasgow-exts, I get the following error message:
YouCantDoThat.lhs:8:
Kind mis-match between `_a :: *' and `Int# :: *#'
Expected type: _a -> Int'
Inferred type: Int# -> Int'
In the first argument of `$', namely `Int''
In the right-hand side of an equation for `disallowed':
Int' $ (a +# a)
The function @allowed@ seems perfectly ok.
> module YouCantDoThat( disallowed, allowed ) where
> import GlaExts
> data Int' = Int' Int#
> disallowed :: Int# -> Int'
> disallowed a = Int' $ a +# a
> allowed :: Int# -> Int'
> allowed a = Int' (a +# a)
One additional comment. I frequently use quotes (') as suffixes
for identifier and type names. As can be seen above ghc loves adding
quotes (` and ') around parts of its messages. This becomes *very*
confusing when the last part of the message consists of an
identifier suffixed by a one or more quote symbols.
Regards,
Marc van Dongen
