libghc-bitarray-dev 0.0.1.1-6build2 (amd64 binary) in ubuntu hirsute

 This package provides mutable and immutable bit arrays
 implemented as packed arrays of 64 bit words. It provides a
 pure interface as well as monadic interfaces for the IO and
 ST monad.
 .
 This package provides a library for the Haskell programming language.
 See http://www.haskell.org/ for more information on Haskell.