src/test/ui/hrtb/hrtb-debruijn-in-receiver.stderr

   1 error[E0499]: cannot borrow `foo` as mutable more than once at a time
   2   --> $DIR/hrtb-debruijn-in-receiver.rs:17:5
   3    |
   4 LL |     foo.insert();
   5    |     ------------ first mutable borrow occurs here
   6 LL |     foo.insert();
   7    |     ^^^^^^^^^^^^
   8    |     |
   9    |     second mutable borrow occurs here
  10    |     first borrow later used here
  11
  12 error: aborting due to previous error
  13
  14 For more information about this error, try `rustc --explain E0499`.