error[E0499]: cannot borrow `cache` as mutable more than once at a time
  --> tests/ui/double-get-without-scope.rs:9:13
   |
7  |     let x = cache.get(&"a").unwrap().as_str();
   |             ----- first mutable borrow occurs here
8  |     // Should failed here, since `x` already mutually borrowed cache.
9  |     let y = cache.get(&"b").unwrap().as_str();
   |             ^^^^^ second mutable borrow occurs here
10 |     let z = cache.get(&"c").unwrap().as_str();
11 |     [x, y, z].join(" ");
   |      - first borrow later used here

error[E0499]: cannot borrow `cache` as mutable more than once at a time
  --> tests/ui/double-get-without-scope.rs:10:13
   |
7  |     let x = cache.get(&"a").unwrap().as_str();
   |             ----- first mutable borrow occurs here
...
10 |     let z = cache.get(&"c").unwrap().as_str();
   |             ^^^^^ second mutable borrow occurs here
11 |     [x, y, z].join(" ");
   |      - first borrow later used here