Module `Library.Modes`

Configuration for the "modes" field of library.

Some examples as found in dune files:

  (modes byte)
  (modes byte native)
  (modes best)
  (modes :standard melange)

module Predicate : sig ... end

A very crucial design points here is that the predicates are syntactic. They do not talk about the evaluation of the ordered set, but refer to what is written in the dune file, literally.