Hello,
when I try to compile the program below with "ghc -fglasgow-exts"
it says
ghc-5.02: panic! (the `impossible' happened, GHC version 5.02):
NoCgInfo!
I couldn't find a smaller example because little modifications make
the problem go away, e.g.
- removing the type signature for `k'
- replacing `y ([] ++ [[]] ++ [])' by `y ([] ++ [[]])'
- changing the definition of `g' or `h', e.g.
h ys = map (k (y [[0]])) ys
Regards,
Armin
module Test where
import List (transpose)
data X a = X a
class Y a b | a -> b where
y :: a -> X b
instance Y [[a]] a where
y ((x:_):_) = X x
g :: Num a => [X a] -> [X a]
g xs = h xs
where
h ys = ys ++ map (k (y [[0]])) xs
k :: X a -> X a -> X a
k _ _ = y ([] ++ [[]] ++ [])
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