parse failure: invalid doc after constructor

[shapr]

haddock fails to parse a file that has an invalid doc comment after a constructor.

module Main where

main = print "hi"

data Foo = Bar Int {- | Docs -}

[Kleidukos]

Indeed, it's rather unfortunate that the error isn't better.

[harpocrates]

In upcoming GHC 9.0 release, this will just be a warning instead of an error.