//@ run-pass
#![allow(dead_code)]
#![allow(unconditional_recursion)]
trait Foo {
}
fn b(_x: Box<dyn Foo+Send>) {
fn c(x: Box<dyn Foo+Sync+Send>) {
e(x);
fn d(x: Box<dyn Foo+Send>) {
fn e(x: Box<dyn Foo>) {
pub fn main() { }