os-rust/tests/ui/borrowck/borrowck-uniq-via-lend.rs

fn borrow(_v: &isize) {}





fn local() {
    let mut v: Box<_> = Box::new(3);
    borrow(&*v);
}

fn local_rec() {
    struct F { f: Box<isize> }
    let mut v = F {f: Box::new(3)};
    borrow(&*v.f);
}

fn local_recs() {
    struct F { f: G }
    struct G { g: H }
    struct H { h: Box<isize> }
    let mut v = F {f: G {g: H {h: Box::new(3)}}};
    borrow(&*v.f.g.h);
}

fn aliased_imm() {
    let mut v: Box<_> = Box::new(3);
    let w = &v;
    borrow(&*v);
    w.use_ref();
}

fn aliased_mut() {
    let mut v: Box<_> = Box::new(3);
    let w = &mut v;
    borrow(&*v); //~ ERROR cannot borrow `*v`
    w.use_mut();
}

fn aliased_other() {
    let mut v: Box<_> = Box::new(3);
    let mut w: Box<_> = Box::new(4);
    let x = &mut w;
    borrow(&*v);
    x.use_mut();
}

fn aliased_other_reassign() {
    let mut v: Box<_> = Box::new(3);
    let mut w: Box<_> = Box::new(4);
    let mut x = &mut w;
    x = &mut v;
    borrow(&*v); //~ ERROR cannot borrow `*v`
    x.use_mut();
}

fn main() {
}

trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { }  }
impl<T> Fake for T { }