let id = Some 42;;
match id with
| Some x
when x
= 10 -> Printf.printf
"%d" x
bGV0IGlkID0gU29tZSA0Mjs7CgptYXRjaCBpZCB3aXRoCgl8IFNvbWUgeCB3aGVuIHggPSAxMCAtPiBQcmludGYucHJpbnRmICIlZCIgeAoJfCBOb25lIC0+IFByaW50Zi5wcmludGYgImhtIgoJfCBfIC0+IFByaW50Zi5wcmludGYgImthcHBhIg==