Stack deleting lines in Cabal file.

[aditya siram]

Hi all,

Stack 1.5.1 appears to be deleting lines from a project's .cabal file. For example, if you run `stack build` on a standard Scotty web app [1] the build dies with:

../haskell-rest-demo/app/Main.hs:6:1: error:
    Failed to load interface for ‘Web.Scotty’
    Use -v to see a list of the files searched for.

If I then add a scotty dependency in the appropriate place [2] and re-run `stack build` that line actually disappears from the cabal file.

Before I opened an issue I just wanted to make sure I wasn't missing something obvious.

Apologies if this is a known issue.

Thanks!
-deech

[1] https://github.com/mvolkmann/haskell-rest-demo
[2] https://github.com/mvolkmann/haskell-rest-demo/blob/master/rest-demo.cabal#L43

[Christopher Allen]

Is there a package.yaml in the project? If so, it's using hpack w/ the
package.yaml.

The project you linked is also using hpack. The Cabal files are
checked into source control as a courtesy to Cabal and Hackage users.

Delete the package.yaml and use the Cabal file solely or edit the
package.yaml instead.

Cf. https://github.com/sol/hpack

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--
Chris Allen
Currently working on http://haskellbook.com

[aditya siram]

I upgraded to 1.6.1 and that fixed it.
Thanks!