main()1 fn main() {
2     let foo = &mut 1;
3 
4     // (separate lines to ensure the spans are accurate)
5 
6      let &_ //~  ERROR mismatched types
7             //~| expected mutable reference `&mut {integer}`
8             //~| found reference `&_`
9             //~| types differ in mutability
10         = foo;
11     let &mut _ = foo;
12 
13     let bar = &1;
14     let &_ = bar;
15     let &mut _ //~  ERROR mismatched types
16                //~| expected reference `&{integer}`
17                //~| found mutable reference `&mut _`
18                //~| types differ in mutability
19          = bar;
20 }
21