Bundled library haddocks don't have source links on instances
Instance haddocks usually come with source links, for example https://hackage.haskell.org/package/binary-0.8.8.0/docs/Data-Binary.html#t:Get:
In the haddocks bundled with the GHC releases, these source links are not present:
The source links are also missing from the
base haddocks on Hackage: https://hackage.haskell.org/package/base-18.104.22.168/docs/Control-Applicative.html#t:WrappedMonad
This makes it unreasonably hard to find the instance definitions.