"Suspicious state from syntax checker haskell-stack-ghc"

[flycheck]

"Suspicious state from syntax checker haskell-stack-ghc"

[bigos]

Since Google lists this issue at the top I thought I would add my comment. I had this error:

Suspicious state from syntax checker haskell-stack-ghc: Flycheck checker haskell-stack-ghc returned non-zero exit code 1, but its output contained no errors: Run from outside a project, using implicit global project config
Compiler version mismatched, found ghc-7.10.3 (x86_64), but expected minor version match with ghc-8.0.2 (x86_64) (based on resolver setting in /home/jacek/.stack/global-project/stack.yaml).

I have edited the relevant file
nano ~/.stack/global-project/stack.yaml
and changed the resolver from resolver: lts-8.15 to:
resolver: ghc-7.10.3

Please comment on the above and perhaps point me to a better solution. Other places discussing the problem mention it's some king of stack cabal environment mismatch, but none of the offers a guide to solve the problem.

[ocramz]

FIXED, after modifying my ~.emacs.d/init.el as follows:

• INSTALLING exec-path-from-shell (https://github.com/purcell/exec-path-from-shell)
• COMMENTING OUT

(eval-after-load 'flycheck      
   '(add-hook 'flycheck-mode-hook #'flycheck-haskell-setup))

• ACTIVATING global-flycheck-mode (adding the entry '(global-flycheck-mode t) in the list (custom-set-variables ) in init.el).

Thank you @lunaryorn , also for the blog about emacs -Q , which taught me a few useful things.

[swsnr]

Hello.

Thank you very much for reporting this issue. We will try to address it as soon as possible. However, we need additional information from you. Please tell us

• your Flycheck version, as in M-x flycheck-version,
• and the output of M-x flycheck-verify-setup in an affected buffer.

Please also include the complete error message. You can copy it from the *Messages* buffer.

It'd be awesome if you could try to reproduce the bug in emacs -Q as well, and provide a step-by-step recipe for us to reproduce the issue as well.

Please add a comment with all this information. If you think that you already provided all necessary information please tell us as well. If you have difficulties with specific steps please do not hesitate to ask.

Thank you very much for using Flycheck, and for taking the time to report this issue. We are looking forward to work with you to solve this problem 😊

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[ocramz]

• Flycheck version 26
• M-x flycheck-verify-setup : I don't understand why, even after restarting Emacs, flycheck isn't found (it's in my .local/bin):

$ which hlint
/Users/ocramz/.local/bin/hlint

$ hlint --version
HLint v1.9.31, (C) Neil Mitchell 2006-2016

Syntax checkers for buffer Vec.hs in haskell-mode:

  haskell-stack-ghc
    - predicate:  t
    - executable: Found at /usr/bin/stack

  haskell-ghc
    - predicate:  t
    - executable: Found at /Applications/ghc-7.10.3.app/Contents/bin/ghc

  haskell-hlint
    - predicate:  nil
    - executable: Not found

Flycheck Mode is enabled.  Use C-u C-c ! x to enable disabled
checkers.

• After turning on Flycheck, the following appears:

Suspicious state from syntax checker haskell-stack-ghc: 
Checker haskell-stack-ghc returned non-zero exit code 1, but no errors from output: 
No compiler found, expected minor version match with ghc-7.10.3 (x86_64) 
(based on resolver setting in /Users/ocramz/Dropbox/RESEARCH/Haskell/petsc-hs/stack.yaml). 
Try running stack setup to locally install the correct GHC
Checker definition probably flawed.

[swsnr]

@ocramz You're welcome. I'm happy to hear that you could solve this problem. Thanks for reporting the issue.

[raghuugare]

Was about to report a similar issue here. Thank you @ocramz & @lunaryorn !
(In my case, the issue cropped up when I switched from cabal to stack & back to cabal--in any case, I wish that we all move towards 1 preferred system soon which means less headaches for everyone!)

@lunaryorn - special thanks for your blog on the emacs -Q option. Will definitely share it on!

Keep up the great work!