SlackBuildsOrg/haskell/haskell-hashable

A class for types that can be converted to a hash value.

This package defines a class, Hashable, for types that can be
converted to a hash value. This class exists for the benefit of
hashing-based data structures. The package provides instances for
basic types and a way to combine hash values.

After uninstalling, run this command to unregister the package from
the ghc package database:   ghc-pkg recache