struct Foo;

impl Foo {
    fn do_mut_stuff(&mut self) {}

    fn do_immut_stuff(&self) {}
}

fn run(mut really_long_name: Foo) {
    let alias = &mut really_long_name;

    alias.do_mut_stuff();
    alias.do_immut_stuff();
    alias.do_mut_stuff();
}

fn main() {}