error[E0499]: cannot borrow `f` as mutable more than once at a time
  --> $DIR/borrowck-call-is-borrow-issue-12224.rs:23:16
   |
23 |     f(Box::new(|| {
   |     -          ^^ second mutable borrow occurs here
   |     |
   |     first mutable borrow occurs here
24 |     //~^ ERROR: cannot borrow `f` as mutable more than once
25 |         f((Box::new(|| {})))
   |         - borrow occurs due to use of `f` in closure
26 |     }));
   |       - first borrow ends here

error: cannot borrow immutable borrowed content `*f` as mutable
  --> $DIR/borrowck-call-is-borrow-issue-12224.rs:36:5
   |
35 | fn test2<F>(f: &F) where F: FnMut() {
   |                -- use `&mut F` here to make mutable
36 |     (*f)(); //~ ERROR: cannot borrow immutable borrowed content `*f` as mutable
   |     ^^^^

error: cannot borrow immutable `Box` content `*f.f` as mutable
  --> $DIR/borrowck-call-is-borrow-issue-12224.rs:44:5
   |
44 |     f.f.call_mut(()) //~ ERROR: cannot borrow immutable `Box` content `*f.f` as mutable
   |     ^^^

error[E0504]: cannot move `f` into closure because it is borrowed
  --> $DIR/borrowck-call-is-borrow-issue-12224.rs:63:13
   |
62 |     f(Box::new(|a| {
   |     - borrow of `f` occurs here
63 |         foo(f);
   |             ^ move into closure occurs here

error[E0507]: cannot move out of captured outer variable in an `FnMut` closure
  --> $DIR/borrowck-call-is-borrow-issue-12224.rs:63:13
   |
63 |         foo(f);
   |             ^ cannot move out of captured outer variable in an `FnMut` closure

error: aborting due to 5 previous errors