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