Parse error on input 'where'

[william2011]

Haskell : ghc test1.hs
Parse error on input 'where'

promote f = Gen (\n r -> \a -> m n r where Gen m = f a)

change heireachy

promote :: (a -> Gen b) -> (Gen (a->b))
promote f = Gen (\n r ->
\a ->
m n r
where Gen m = f a)

i do not see any problem in above code, why error

[cgroza]

You can't have a where inside a lamda. You still can put it outside the lambda and it will still have tho same effects.
Example:


f = (\x -> 5 + z) where z = 5 -- correct

f = (\x -> 5 + z where z = 5) -- incorrect


Also, please use code tags since the indentation in Haskell matters.