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Three more examples of monotonicity failures in OCaml #12

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yallop wants to merge 1 commit into stedolan:main from yallop:more-monotonicity

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yallop commented Jul 15, 2021

This PR adds three more examples of monotonicity failures in OCaml, relating to

the relaxed value restriction and strict positivity
compatibility
labeled arguments

Another possible addition involves constructor disambiguation:

type t = A | B

module M :
sig
  type t (* = A *)
end =
struct
  type t = A
end

let f = M.[A;B]

but I think that one's less convincing, because it's more about namespacing than type systems as such.


          Some more examples of monotonicity failures.

eac1d47

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