stack does not allow using an external package from ghci

[UnkindPartition]

I have a library that I want to debug. For that, I need a package that's not among the library's dependencies (base16-bytestring). But stack ghci would not allow me to do that, even if I pass --package:

% stack ghci --package base16-bytestring presta-lib:lib 
The following GHC options are incompatible with GHCi and have not been passed to it: -O0
Configuring GHCi with the following packages: presta-lib
GHCi, version 7.10.2: http://www.haskell.org/ghc/  :? for help
...
Ok, modules loaded: ...
> :m +Data.ByteString.Base16 Data.SafeCopy Data.Serialize

<no location info>:
    Could not find module ‘Data.ByteString.Base16’
    It is a member of the hidden package ‘base16-bytestring-0.1.1.6@base1_LGFgY5jaffY4IePNqJx55U’.

% stack --version
Version 0.1.11.0, Git revision 189d677ca6d63012ebe56083c9bee49f635bcc0d (dirty) (2919 commits) x86_64

[UnkindPartition]

I just discovered --no-package-hiding, but it doesn't quite work either. I guess I'll open a separate issue for that.

[UnkindPartition]

Ok, so one problem with --no-package-hiding isn't really a bug, just unfortunate expected behaviour:

    Ambiguous module name ‘Crypto.MAC.HMAC’:
      it was found in multiple packages:
      cryptonite-0.6@crypt_1A87AV0e5C8BaBsLLV3mNF cryptohash-0.11.6@crypt_5epyAhdyCoGIBkp2icUC24

[mgsloan]

Good point, looks like a bug.

[luigy]

In the meantime I think you can get around it by:

stack ghci --ghci-options "-package base16-bytestring" --package base16-bytestring presta-lib:lib

@mgsloan I wonder if it should be the default to pass a formatted ghciAdditionalPackages to ghci
Are there any edge cases to consider, though?

[mgsloan]

@luigy I don't think there are any funky edge cases. I've pushed a couple commits resolving this.

Feel free to re-open if the problem is still around after these changes.