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Pitometsu/m.ml

Created August 21, 2019 17:40
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first-class modules type limitation
Raw
m.ml
utop # let (module M) = (module Caml.Map.Make(Int64) : Caml.Map.S) in let to_ : unit -> _ M.t = fun () -> failwith "und" in to_;;
Error: This expression has type unit -> 'a M.t
but an expression was expected of type 'b
The type constructor M.t would escape its scope
utop # let module M = Caml.Map.Make(Int64) in let to_ : unit -> _ M.t = fun () -> failwith "und" in to_;;
- : unit -> 'a Map.Make(Core_kernel__Int64).t = <fun>
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