module type S : sig ... endmodule type S1 : sig ... endmodule type S2 : sig ... endmodule type Indexable : sig ... endThe functor Hexdump.Of_indexable uses length and get to iterate over the
characters in a value and produce a hex dump.
module type Indexable1 : sig ... endmodule type Indexable2 : sig ... endmodule type Hexdump : sig ... end