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