Package: haskell-devscripts Severity: important haskell-devscripts does not currently support packages with internal libraries (correctly). Partial support was added to support GHC registration with a directory of files instead of a single file, where the first file in the directory was selected, but this unfortunately was too naive and does not work in all cases.
Packages currently have to be patched to remove the internal libraries (e.g., attoparsec), so ideally we should add proper support for internal libraries to the tooling.