Hi,

I have experienced difficulties using the overlays system together with other 
'established' practices.

For instance, given such a 'overlays' definition 
(https://github.com/CIRB/nixpkgs-config/blob/master/overlays/default.nix#L12) 
(which works perfectly fine),
this other local nix file 
(https://github.com/Gabriel439/Haskell-Dhall-Bash-Library/blob/master/release.nix#L3)
  is going to fail with:

error: attribute ‘dhall-bash’ missing, at 
/home/vagrant/projects/haskell/Haskell-Dhall-Bash-Library/release.nix:26:18

Somehow it looks like the 'overlays' definition wins in this case, shadowing 
the local one for haskellPackages ?

As an overlays user, how am I supposed to deal with this ?

Thanks for your help
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