Pretty print type signatures

[coot]

trafficstars

It would be nice to have a pretty printer for type signatures in haddock. Complex types are not very readable, and often don't even fit into a single screen line.

[sjakobi]

Duplicate of https://github.com/haskell/haddock/issues/472?

[coot]

I don't think so. #472 only applies to type signatures which have haddoc annotations, which are pretty printed (at least split into separate lines), an example of type signature that is not pretty printed.