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|
(* TEST
expect;
*)
module Non_recursive_let_bad = struct
type 'a t =
| N of 'a
| C of 'a t * 'a t
let[@tail_mod_cons] rec map f l =
match l with
| N v -> N (f v)
| C (a, b) ->
let map' l = map f l in
C (map' a, (map' [@tailcall]) b)
end
[%%expect {|
Lines 6-11, characters 30-40:
6 | ..............................f l =
7 | match l with
8 | | N v -> N (f v)
9 | | C (a, b) ->
10 | let map' l = map f l in
11 | C (map' a, (map' [@tailcall]) b)
Warning 71 [unused-tmc-attribute]: This function is marked @tail_mod_cons
but is never applied in TMC position.
Line 11, characters 19-39:
11 | C (map' a, (map' [@tailcall]) b)
^^^^^^^^^^^^^^^^^^^^
Warning 51 [wrong-tailcall-expectation]: expected tailcall
Line 11, characters 19-39:
11 | C (map' a, (map' [@tailcall]) b)
^^^^^^^^^^^^^^^^^^^^
Warning 51 [wrong-tailcall-expectation]: expected tailcall
module Non_recursive_let_bad :
sig
type 'a t = N of 'a | C of 'a t * 'a t
val map : ('a -> 'b) -> 'a t -> 'b t
end
|}]
module Non_recursive_let_good = struct
type 'a t =
| N of 'a
| C of 'a t * 'a t
let[@tail_mod_cons] rec map f l =
match l with
| N v -> N (f v)
| C (a, b) ->
let[@tail_mod_cons] map' l = map f l in
C (map' a, (map' [@tailcall]) b)
end
[%%expect {|
module Non_recursive_let_good :
sig
type 'a t = N of 'a | C of 'a t * 'a t
val map : ('a -> 'b) -> 'a t -> 'b t
end
|}]
|
