cabal-dev ghci masks wrong packages

[s9gf4ult]

Here is the test project https://github.com/s9gf4ult/conduplay/tree/tag1.

cabal-dev ghci masks packages which are set in build-depends of this file

Loading package bytestring-0.9.2.1 ... linking ... done.
Loading package text-0.11.2.3 ... linking ... done.
Loading package blaze-builder-0.3.1.0 ... linking ... done.
Ok, modules loaded: Main.
Prelude Main> :load conduplay.hs

conduplay.hs:13:8:
    Could not find module `Control.Monad.Trans'
    It is a member of the hidden package `mtl-2.1.2'.
    Perhaps you need to add `mtl' to the build-depends in your .cabal file.
    Use -v to see a list of the files searched for.
Failed, modules loaded: none.

but in the cabal file

executable conduplay
  main-is:             conduplay.hs
  -- other-modules:       
  build-depends:       base,
                       conduit,
                       text,
                       mtl,
                       unordered-containers,
                       containers

mtl is set as build-depends.

I belive this is because cabal-dev masks packages accoring .cabal file, but it should not, this is not right, because of different dependencies of different executables/libraries and different source files as well.