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(* Check the effectiveness of structured constant propagation and
static allocation.
Ref: http://caml.inria.fr/mantis/view.php?id=5779
*)
let () =
let x0 = Gc.allocated_bytes () in
let x1 = Gc.allocated_bytes () in
let pair x y = (x, y) in
let a = pair 1 2 in
let b = pair a ["x";"y"] in
let g () = (a, fst b) in
assert (g () == ((1,2), (1,2)));
assert (fst (pair a a) == (1, 2));
assert (snd b != ["x"; "y"]); (* mutable "constant", cannot be shared *)
let x2 = Gc.allocated_bytes () in
assert(x1 -. x0 = x2 -. x1)
(* check that we did not allocated anything between x1 and x2 *)
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