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|
(* TEST
* expect
*)
(* empty variant *)
type t = |;;
[%%expect{|
type t = |
|}];;
let f (x:t) = match x with _ -> .
[%%expect{|
val f : t -> 'a = <fun>
|}];;
type m = A of t | B of int * t | C of {g:t}
[%%expect{|
type m = A of t | B of int * t | C of { g : t; }
|}]
let g (x:m) =
match x with
| A _ | B _ | C _ -> .
[%%expect{|
val g : m -> 'a = <fun>
|}]
let f : t option -> int = function None -> 3
[%%expect{|
val f : t option -> int = <fun>
|}]
type nothing = |
type ('a, 'b, 'c) t = | A of 'a | B of 'b | C of 'c
module Runner : sig
val ac : f:((unit, _, unit) t -> unit) -> unit
end = struct
let ac ~f =
f (A ());
f (C ());
;;
end
let f () =
Runner.ac
~f:(fun (abc : (_,nothing,_) t) ->
let value =
match abc with
| A _ -> 1
in
Printf.printf "%i\n" value
)
[%%expect{|
type nothing = |
type ('a, 'b, 'c) t = A of 'a | B of 'b | C of 'c
module Runner : sig val ac : f:((unit, 'a, unit) t -> unit) -> unit end
Lines 16-17, characters 8-18:
16 | ........match abc with
17 | | A _ -> 1
Warning 8 [partial-match]: this pattern-matching is not exhaustive.
Here is an example of a case that is not matched:
C ()
val f : unit -> unit = <fun>
|}]
type nothing = |
type 'b t = A | B of 'b | C
let g (x:nothing t) = match x with A -> ()
[%%expect{|
type nothing = |
type 'b t = A | B of 'b | C
Line 3, characters 22-42:
3 | let g (x:nothing t) = match x with A -> ()
^^^^^^^^^^^^^^^^^^^^
Warning 8 [partial-match]: this pattern-matching is not exhaustive.
Here is an example of a case that is not matched:
C
val g : nothing t -> unit = <fun>
|}]
|
