//ww:run-exit 50
// Migrated from 775_io_vtable_run row closer_void_noop.
package main;
import io;
export fn main() i32 = {
    let vt: io.vtable;
    let v: io.stream = &vt;
    let r = io.close(v);
    if (r is void) { return 50; };
    return 99;
};