#![feature(test)]
extern crate test;

use std::sync::Arc;

struct DA;

trait Drain {
    fn log(&self, &DA);
}

struct BlackBoxDrain;

impl Drain for BlackBoxDrain {
    fn log(&self, da : &DA) {
       test::black_box::<&DA>(da);
    }
}

fn f(d : Arc<Drain>) {
    d.log(&DA)
}

fn main() {

    let arc_d = Arc::new(BlackBoxDrain);
    f(arc_d);
}

movq    16(%r15), %rdi
leaq    15(%rdi), %rax
negq    %rdi
andq    %rax, %rdi
addq    %r14, %rdi