Rendered haddock of `Eq` and `Ord` classes are missing class methods

[christiaanb]

The rendered haddock (included in the GHC 8.0.1 release) for the Eq and Ord classes are missing:

• Their class methods
• Their source links

See:

​http://hackage.haskell.org/package/base-4.9.0.0/docs/Data-Eq.html#t:Eq
​http://hackage.haskell.org/package/base-4.9.0.0/docs/Prelude.html#t:Eq
​http://hackage.haskell.org/package/base-4.9.0.0/docs/Data-Ord.html#t:Ord
​http://hackage.haskell.org/package/base-4.9.0.0/docs/Prelude.html#t:Ord

Other (deriviable) classes, for example Show, or Enum, do not have these problems.

I've also reported this as a GHC issue: https://ghc.haskell.org/trac/ghc/ticket/12519

[k-bx]

In #552 duplicate I've provided a repo with easy reproduction steps.

[niteria]

I have a fix here, but due to poor internet it's difficult for me to commit/send a pull request. https://ghc.haskell.org/trac/ghc/ticket/12519#comment:6

[ysangkok]

I think this was fixed with 240bc38 ?