| error[E0500]: closure requires unique access to `f` but `*f` is already borrowed | |
| --> $DIR/borrowck-insert-during-each.rs:27:9 | |
| | | |
| LL | f.foo( | |
| | - borrow occurs here | |
| LL | |a| { //~ ERROR closure requires unique access to `f` | |
| | ^^^ closure construction occurs here | |
| LL | f.n.insert(*a); | |
| | - borrow occurs due to use of `f` in closure | |
| LL | }) | |
| | - borrow ends here | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0500`. |