FlyCheck unable to find sandboxed packages

[geraldus]

Currently I'm using shared sandbox created by Stackage CLI¹, but I had same problem with normal sandbox. FlyCheck reports me a lot of haskell-ghc checker "Could not find module" errors when checking sandboxed project (output of C-c ! C-c haskell-ghc RET):

-- mode: compilation; default-directory: "~/Haskell/SandBox/" --
Compilation started at Tue May 26 17:52:21

ghc -Wall -fno-code -i/Users/arthurfayzrakhmanov/Haskell/SandBox/ -x hs /Users/arthurfayzrakhmanov/Haskell/SandBox/Foundation.hs

Handler/Form/Import.hs:13:18:
Could not find module ‘Text.Shakespeare.I18N’
Use -v to see a list of the files searched for.

Handler/Form/Import.hs:14:18:
Could not find module ‘Yesod.Core’
Use -v to see a list of the files searched for.

Handler/Form/Import.hs:15:18:
Could not find module ‘Yesod.Form.Fields’
Use -v to see a list of the files searched for.
… and so on

And cabal list --installed from project root makes sure that modules are actually installed:

$ cabal list --installed

…

* shakespeare
    Synopsis: A toolkit for making compile-time interpolated templates
    Default available version: 2.0.5
    Installed versions: 2.0.5
    Homepage: http://www.yesodweb.com/book/shakespearean-templates
    License:  MIT 
…

* yesod-core
    Synopsis: Creation of type-safe, RESTful web applications.
    Default available version: 1.4.9.1
    Installed versions: 1.4.9.1
    Homepage: http://www.yesodweb.com/
    License:  MIT

* yesod-form
    Synopsis: Form handling support for Yesod Web Framework
    Default available version: 1.4.4.1
    Installed versions: 1.4.4.1
    Homepage: http://www.yesodweb.com/
    License:  MIT

…

I guess this is because of checker use ghc -Wall -fno-code -i<path> command; should it use cabal in case of sandboxed projects?

[swsnr]

Please show the output of C-c ! v. Does it work after M-x normal-mode?

[swsnr]

Besides, it's Flycheck, not FlyCheck, and there's no reason to emphasize it…

[swsnr]

And, additionally, please show me your Flycheck Haskell setup from your init file.

[geraldus]

Please excuse me, I've updated flycheck-haskell and now the issue is not relevant!
BTW, C-c ! v showed me green statuses for each checker and I don't know where did I get this capital C from! (:

[swsnr]

@geraldus Never mind :) I'm unsure how a Flycheck update could have solved this, unless you used a very old version, but I'm happy that it works for you now :)