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// run-pass
#![allow(dead_code)]
#![deny(unused_mut)]
#[derive(Debug)]
struct A {}
fn init_a() -> A {
A {}
}
#[derive(Debug)]
struct B<'a> {
ed: &'a mut A,
}
fn init_b<'a>(ed: &'a mut A) -> B<'a> {
B { ed }
}
#[derive(Debug)]
struct C<'a> {
pd: &'a mut B<'a>,
}
fn init_c<'a>(pd: &'a mut B<'a>) -> C<'a> {
C { pd }
}
#[derive(Debug)]
struct D<'a> {
sd: &'a mut C<'a>,
}
fn init_d<'a>(sd: &'a mut C<'a>) -> D<'a> {
D { sd }
}
fn main() {
let mut a = init_a();
let mut b = init_b(&mut a);
let mut c = init_c(&mut b);
let d = init_d(&mut c);
println!("{:?}", d)
}
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