libghc-hashable-dev - 1.4.3.0-1+b1 main

It 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.
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This package provides a library for the Haskell programming language.
See http://www.haskell.org/ for more information on Haskell.