1error[E0499]: cannot borrow `*self` as mutable more than once at a time
2  --> $DIR/unboxed-closures-recursive-fn-using-fn-mut.rs:22:21
3   |
4LL |         (self.func)(self, arg)
5   |         ----------- ^^^^ second mutable borrow occurs here
6   |         |
7   |         first mutable borrow occurs here
8   |         first borrow later used by call
9
10error: aborting due to previous error
11
12For more information about this error, try `rustc --explain E0499`.
13