QuantifiedConstraints parse error

[georgefst]

Hlint reports a parse error at the line:

deriving instance (forall a. Show (t a)) => Show (E t c)

Despite trying everything I can to tell hlint to enable QuantifiedConstraints.

GHC is fine with it.

It's very possible this has the same cause as #850.

[georgefst]

Ok, I was running an older version of hlint than I realised. This appears to have been fixed.

[georgefst]

Well actually, there is something odd going on here, but maybe it's an issue with hie.

On version 2.2.10, hlint is able to parse the file when I use the standalone executable, but not when used as part of hie (the parser reports 'Illegal class assertion').

I have checked, and my hie executable was built with hlint-2.2.10.

[ndmitchell]

I'd bring the issue over to hie - if it works standalone then I guess it's something hie is doing? Or maybe they are using the API which is doing the wrong thing?

[ndmitchell]

HIE depended on an old version, so they can fix it.