@hackage fclabels0.3.0

First class labels that act as bidirectional records fields. The labels are fully composable and can be used to get, set and modify part of datatypes in a consistent way. The label datatype, conveniently called :->, is an instance of the Category type class, so is has a proper identity and composition. The library has support for automatically deriving labels from record selectors that start with an underscore.