ghc-boot process seems to have failed

[etanter]

ghc-boot process seems to have failed

[iquiw]

It is correct behavior that % boot or % check ... is written. However, outputs of their command should follow them when ghc-mod correctly works.
Did you run ghc-mod boot in /Users/etanter/Develop/Haskell? If not, please try.

[etanter]

Yes, I did do that, and it gives a huge list of identifiers, which I guess is the expected behavior.

[iquiw]

Ya, ghc-mod boot seems to work.
I have no idea about the cause.
I suppose it is ghc-mod issue (ghc-modi or ghc-mod's elisp).

[etanter]

Thanks. If you have any further suggestion on how to identify the source of the problem, that'd be very welcome. For now I'm stuck. I installed ghc-mod and company-ghc on another machine (same Mac OS 10.10), and have exactly the same issue...

[iquiw]

Can you check if ghc-modi works?

$ /Users/etanter/Develop/Haskell
$ ghc-modi
boot

[etanter]

ghc-modi seems to work as well, as boot gives me a huge list of symbols.

[iquiw]

So the suspect is ghc-mod's elisp.
Which version (MELPA, Hackage, etc.) of ghc-mod are you using?

[etanter]

I have installed emacs packages through MELPA, and haskell packages through cabal.

$ cabal list ghc-mod
* ghc-mod
    Synopsis: Happy Haskell Programming
    Default available version: 5.2.1.2
    Installed versions: 5.2.1.2
    Homepage: http://www.mew.org/~kazu/proj/ghc-mod/
    License:  BSD3

As for emacs packages:

ghc-20150713.400/
company-ghc-20150613.123/ 

Maybe a clue: when I try to run M-x ghc-debug, it complains that ghc-interactive-command is void...

[iquiw]

I got what is happening.
MELPA version of ghc-mod uses legacy-interactive argument when calling ghc-mod process.
It is not supported by Hackage version of ghc-mod.

So possible solutions are:

• Build ghc-mod command from github master.
• Use MELPA-stable version of ghc-mod elisp. (I am not sure it works or not.)

[etanter]

brilliant! I used the elisp from MELPA-stable and it works like a charm.

Thank you very much for your help in diagnosing and fixing this!!

[iquiw]

You are welcome 😉