constraints-0.8: Constraint manipulation

# constraints-0.8: Constraint manipulation

GHC 7.4 gave us the ability to talk about `ConstraintKinds`. They stopped crashing the compiler in GHC 7.6.

This package provides a vocabulary for working with them.

Modules

- Data
  - Data.Constraint
    - Data.Constraint.Deferrable
    - Data.Constraint.Forall
    - Data.Constraint.Lifting
    - Data.Constraint.Unsafe