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(** Test that matching multiple values doesn't allocate a block. *)
let f x y =
match x, y with
| Some x, None
| None, Some x -> x + 1
| None, None -> 0
| Some x, Some y -> x + y
| exception _ -> -1
let test_multiple_match_does_not_allocate =
let allocated_bytes = Gc.allocated_bytes () in
let allocated_bytes' = Gc.allocated_bytes () in
let a = Some 3 and b = None in
let allocated_bytes'' = Gc.allocated_bytes () in
let _ = f a b in
let allocated_bytes''' = Gc.allocated_bytes () in
if allocated_bytes' -. allocated_bytes = allocated_bytes''' -. allocated_bytes''
then
Printf.printf "no allocations for multiple-value match\n"
else
Printf.printf "multiple-value match allocated %f bytes\n"
((allocated_bytes''' -. allocated_bytes'') -.
(allocated_bytes' -. allocated_bytes))
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