Module Base.Comparable

Defines functors for making modules comparable.

Usage example:

        module Foo = struct
          module T = struct
            type t = ... [@@deriving_inline compare, sexp][@@@end]
          end
          include T
          include Comparable.Make (T)
        end

Then include Comparable.S in the signature

        module Foo : sig
          type t = ...
          include Comparable.S with type t := t
        end

To add an Infix submodule:

        module C = Comparable.Make (T)
        include C
        module Infix = (C : Comparable.Infix with type t := t)

A common pattern is to define a module O with a restricted signature. It aims to be (locally) opened to bring useful operators into scope without shadowing unexpected variable names. E.g., in the Date module:

        module O = struct
          include (C : Comparable.Infix with type t := t)
          let to_string t = ..
        end

Opening Date would shadow now, but opening Date.O doesn't:

        let now = .. in
        let someday = .. in
        Date.O.(now > someday)