ocaml/testsuite/tests/letrec/evaluation_order_2.ml

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(* A variant of evaluation_order_1.ml where the side-effects
are inside the blocks. Note that this changes the evaluation
order, as y is considered recursive.
*)
type tree = Tree of tree list
let test =
let rec x = (Tree [(print_endline "x"; y); z])
and y = Tree (print_endline "y"; [])
and z = Tree (print_endline "z"; [x])
in
match (x, y, z) with
| (Tree [y1; z1], Tree[], Tree[x1]) ->
assert (y1 == y);
assert (z1 == z);
assert (x1 == x)
| _ ->
assert false