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// check-pass
use std::io::Write;
struct A(Vec<u8>);
struct B<'a> {
one: &'a mut A,
two: &'a mut Vec<u8>,
three: Vec<u8>,
}
impl<'a> B<'a> {
fn one(&mut self) -> &mut impl Write {
&mut self.one.0
}
fn two(&mut self) -> &mut impl Write {
&mut *self.two
}
fn three(&mut self) -> &mut impl Write {
&mut self.three
}
}
struct C<'a>(B<'a>);
impl<'a> C<'a> {
fn one(&mut self) -> &mut impl Write {
self.0.one()
}
fn two(&mut self) -> &mut impl Write {
self.0.two()
}
fn three(&mut self) -> &mut impl Write {
self.0.three()
}
}
fn main() {}
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