97 lines
2.7 KiB
OCaml
97 lines
2.7 KiB
OCaml
open Ppxlib
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let () =
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let unused_code_warnings = true in
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Deriving.add "zero_do_warn"
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~str_type_decl:
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(Deriving.Generator.make_noarg ~unused_code_warnings
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(fun ~loc ~path:_ _ ->
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[%str
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module Zero = struct
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type t = T0
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end
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let zero = Zero.T0]))
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~sig_type_decl:
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(Deriving.Generator.make_noarg ~unused_code_warnings
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(fun ~loc ~path:_ _ ->
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[%sig:
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module Zero : sig
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type t
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end
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val zero : Zero.t]))
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|> Deriving.ignore
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let () =
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let unused_code_warnings = false in
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Deriving.add "one_no_warn"
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~str_type_decl:
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(Deriving.Generator.make_noarg ~unused_code_warnings
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(fun ~loc ~path:_ _ ->
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[%str
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module One = struct
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type 'a t = T1 of 'a
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end
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let one = One.T1 zero]))
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~sig_type_decl:
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(Deriving.Generator.make_noarg ~unused_code_warnings
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(fun ~loc ~path:_ _ ->
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[%sig:
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module One : sig
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type 'a t
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end
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val one : Zero.t One.t]))
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|> Deriving.ignore
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let () =
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let unused_code_warnings = true in
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Deriving.add "two_do_warn"
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~str_type_decl:
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(Deriving.Generator.make_noarg ~unused_code_warnings
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(fun ~loc ~path:_ _ ->
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[%str
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module Two = struct
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type ('a, 'b) t = T2 of 'a * 'b
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end
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let two = Two.T2 (zero, one)]))
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~sig_type_decl:
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(Deriving.Generator.make_noarg ~unused_code_warnings
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(fun ~loc ~path:_ _ ->
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[%sig:
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module Two : sig
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type ('a, 'b) t
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end
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val two : (Zero.t, Zero.t One.t) Two.t]))
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|> Deriving.ignore
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let () =
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let alias_do_warn =
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let unused_code_warnings = true in
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Deriving.add "alias_do_warn"
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~str_type_decl:
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(Deriving.Generator.make_noarg ~unused_code_warnings
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(fun ~loc ~path:_ _ -> [%str let unit_one = ()]))
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~sig_type_decl:
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(Deriving.Generator.make_noarg ~unused_code_warnings
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(fun ~loc ~path:_ _ -> [%sig: val unit_one : unit]))
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in
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let alias_no_warn =
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let unused_code_warnings = false in
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Deriving.add "alias_no_warn"
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~str_type_decl:
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(Deriving.Generator.make_noarg ~unused_code_warnings
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(fun ~loc ~path:_ _ -> [%str let unit_two = unit_one]))
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~sig_type_decl:
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(Deriving.Generator.make_noarg ~unused_code_warnings
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(fun ~loc ~path:_ _ -> [%sig: val unit_two : unit]))
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in
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(* The derivers are added from right to left *)
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Deriving.add_alias "alias_warn" [ alias_no_warn; alias_do_warn ]
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|> Deriving.ignore
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let () = Driver.standalone ()
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