replace ghc dependency with ghc-lib

[peterbecich]

I think this may solve an issue: input-output-hk/haskell.nix#1829 (comment)

DocTests: <command line>: cannot satisfy -package ghc

https://hackage.haskell.org/package/ghc-lib

I will confirm shortly if it actually solves the issue. Thanks

[martijnbastiaan]

Thanks for the PR, I'll have CI run but I'll be upfront and say that I don't expect to merge this. ghc-lib is a very heavy dependency, and it seems to me that ghc not being accessible as a library is a Nix issue.

Could you run with --debug and post the logs here? I'm interested to see where doctest-parallel fails. Also, if you start a nix shell and do ghci -package ghc and try to import something from that package, does it work?

I'm eager to get Nix support; I've already invested some time in getting Nix to work, but it all seems kinda flaky (pun intended :-)).

[martijnbastiaan]

If this happened after upgrading to the latest doctest-parallel it might be worth trying to disable Nix support with --no-nix.

[martijnbastiaan]

I'm assuming this PR is obsolete given haskell/hackage-server#1154 (comment). Feel free to re-open.

[peterbecich]

Yes, thanks, sorry I didn't follow up on this