Invalid character in name when main module has a directory path

[nc6]

Given an executable qualified by a directory, snack complains about an invalid character in the derivation name:

With this package.yaml section:

executables:
  ffexecutord:
    main: app/FFExecutorD.hs

[nc@lorien:~/topos/tweag/funflow/funflow]$ snack build --package-yaml ./package.yaml
error: invalid character '/' in name 'app/FFExecutorD.hs-single-out'

This may be the same issue as #29

[nmattia]

@nc6 while trying to reproduce, I realized that I'm actually unclear on the semantics of this. Here's what I assumed thus far:

  main: Foo.hs
  source-dirs: src/

--> meaning "the main module Foo.hs is located at src/Foo.hs"

but then I'm not sure how that works if you have

  main: app/Foo.hs
  source-dirs: src/

can you explain what's supposed to happen, or point me to the relevant cabal/hpack docs? thanks!