[Haskell-cafe] haddock (on hackage/stackage) missing references to external libraries

[Johannes Waldmann]

Dear Cafe,

it seems that haddock (as used on hackage)
does not link to identifiers from other packages
(neither in HTML nor in hyperlinked source).

This hurts, especially if a project has several packages
that are meant to be used together, but are split
for others reasons (modularity, maintenance).

Example: This index has an entry for "bpf",
with a non-linked module name Csound.Base:
https://hackage.haskell.org/package/csound-expression-5.3.2/docs/doc-index-B.html

The reason is (I think) that "bpf" is defined elsewhere,
but re-exported, and "elsewhere" is in a different package.

It is very hard to find the name of this package!
(in this case, csound-expression-opcodes)

Of course, in no way is this a complaint about Anton's
csound-* project. I use it in teaching, and I wonder
how could we make documentation more accessible -
without extra manual work.

Now, :doc of ghc-8.6 works, and :info  helps somewhat:
:info bpf ...
  	-- Defined in ‘Csound.Typed.Opcode.SignalGenerators’
but it still does not show the name of the package.
But at least we know the name of the module to look for.

- J.W.