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(* TEST *)
(* Evaluation order for class expressions *)
(* Everything in a class definition is evaluated at object creation time,
except for any toplevel let-bindings which are lifted away and
evaluated at class creation time. *)
let () = print_endline "M1:"
module M1 = struct
let () = print_endline "Before class"
class c =
let () = print_endline "Class init" in
object end
let () = print_endline "After class"
let o1 = new c
let o2 = new c
end
(* PR 13179 *)
let () = print_endline "M2:"
module M2 = struct
let () = print_endline "Before class"
class c =
let open Unit in
let () = print_endline "Class init" in
object end
let () = print_endline "After class"
let o1 = new c
let o2 = new c
end
(* Applications: argument evaluated later *)
let () = print_endline "M3:"
module M3 = struct
class with_param p = object end
let () = print_endline "Before class"
class c =
let () = print_endline "Class init" in
with_param (print_endline "Class param")
let () = print_endline "After class"
let o1 = new c
let o2 = new c
end
(* Nested bindings are not toplevel *)
(* Not testing for side effects in arguments, as bytecode and native compilers
produce different evaluation orders *)
let () = print_endline "M4:"
module M4 = struct
class with_param p = object end
let () = print_endline "Before class"
class c =
(let () = print_endline "Class init" in
with_param)
()
let () = print_endline "After class"
let o1 = new c
let o2 = new c
end
(* Constraints prevent lifting *)
let () = print_endline "M5:"
module M5 = struct
let () = print_endline "Before class"
class c =
(let () = print_endline "Class init" in
object end : object end)
let () = print_endline "After class"
let o1 = new c
let o2 = new c
end
|
