Extensible records for Haskell with lenses.
CoRec (co-record) type constructed in the same style as the existing
Rec type for records. A
CoRec is an open sum type: a value of
CoRec [a,b,c] is either an
b, or a
c. In contrast a
Rec [a,b,c] includes an
b, and, a
Added a concise
Show instance for
Ported the tutorial to haddocks (andrewthad)
Added utilities for working with the
Vinyl 0.5 combines the generality of Vinyl 0.4 with the ease-of-use of previous versions by eschewing the defunctionalized type families and just using plain type constructors; Vinyl 0.4-style records can be recovered in most cases in a modular manner without baking it into the fabric of Vinyl itself.
Also new in 0.5 is a unified lens-based approach to subtyping, coercion and projection.
Vinyl 0.4 is a big departure from previous versions, in that it introduces a universe encoding as a means to generalize the space of keys from strings to any arbitrary space. This means that you can have closed universes for your records.
For details on how to use the new Vinyl, please see
tests/Intro.lhs or view
Jon’s talk at BayHac 2014, Programming in