//ww:run-exit 60
// Migrated from 775_io_vtable_run row closer_set.
package main;
import io;
fn myclose(s: io.stream) (void | io.error) = {
    return void;
};
export fn main() i32 = {
    let vt: io.vtable;
    vt.closer = (&myclose): *io.closer;
    let v: io.stream = &vt;
    let r = io.close(v);
    if (r is void) { return 60; };
    return 99;
};