Some concrete implementations of the abstract interface of the edison library for haskell for use with ghc.

edison is a library of purely function data structures for haskell originally written by chris okasaki. conceptually, it consists of two things:
- a set of type classes defining data the following data structure
abstractions: 'sequences', 'collections' and 'associative
collections'
- multiple concrete implementations of each of the abstractions
this package contains the concrete implementations.