2 fn takes_ref(_: &Foo) {}
5 let ref opt = Some(Foo);
6 opt.map(|arg| takes_ref(arg));
7 //~^ ERROR mismatched types [E0308]
8 opt.and_then(|arg| Some(takes_ref(arg)));
9 //~^ ERROR mismatched types [E0308]
10 let ref opt: Result<_, ()> = Ok(Foo);
11 opt.map(|arg| takes_ref(arg));
12 //~^ ERROR mismatched types [E0308]
13 opt.and_then(|arg| Ok(takes_ref(arg)));
14 //~^ ERROR mismatched types [E0308]
15 let x: &Option<usize> = &Some(3);
16 let y: Option<&usize> = x;
17 //~^ ERROR mismatched types [E0308]
18 let x: &Result<usize, usize> = &Ok(3);
19 let y: Result<&usize, &usize> = x;
20 //~^ ERROR mismatched types [E0308]
21 // note: do not suggest because of `E: usize`
22 let x: &Result<usize, usize> = &Ok(3);
23 let y: Result<&usize, usize> = x;
24 //~^ ERROR mismatched types [E0308]