struct Foo;
impl Foo {
fn get(&self) -> usize {
42
}
fn set(&mut self, b: usize) {
}
}
fn main() {
let mut f = Foo;
f.set(f.get());
}
results in
<anon>:15:11: 15:12 error: cannot borrow `f` as immutable because it is also borrowed as mutable [E0502]
<anon>:15 f.set(f.get());
^
<anon>:15:5: 15:6 note: previous borrow of `f` occurs here; the mutable borrow prevents subsequent moves, borrows, or modification of `f` until the borrow ends
<anon>:15 f.set(f.get());
^
<anon>:15:19: 15:19 note: previous borrow ends here
<anon>:15 f.set(f.get());
^
error: aborting due to previous error
playpen: application terminated with error code 101
Почему? Здесь всё верно, иммутабельное заимствование f при вызове get() кончается до вызова set().
