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Backend type change in OCaml EDSL

The change​

The backend EDSL constructor now accepts a Backend.t (which includes name and flags) instead of a Backend.Name.t.

Sexp configs are not affected. If you write your dunolint config using s-expressions, this change is backward compatible -- (backend bisect_ppx) still works.

OCaml EDSL users must update. If you build predicates in OCaml, the constructor changed from Backend.Name.v to Backend.v.

Migration​

Replace Backend.Name.v with Backend.v:

(* Before *)
let bisect_ppx = Dune.Instrumentation.Backend.Name.v "bisect_ppx"

(* After *)
let bisect_ppx = Dune.Instrumentation.Backend.v "bisect_ppx"

To specify backend flags, use the optional ~flags parameter:

let ppx_windtrap = Dune.Instrumentation.Backend.v "ppx_windtrap" ~flags:["--coverage"]