rust/tests/ui/borrowck/borrowck-loan-blocks-mut-uniq.rs
2023-01-11 09:32:08 +00:00

19 lines
314 B
Rust

fn borrow<F>(v: &isize, f: F) where F: FnOnce(&isize) {
f(v);
}
fn box_imm() {
let mut v: Box<_> = Box::new(3);
borrow(&*v,
|w| { //~ ERROR cannot borrow `v` as mutable
v = Box::new(4);
assert_eq!(*v, 3);
assert_eq!(*w, 4);
})
}
fn main() {
}