struct Node { elem: i32, next: Option<Box<Node>>, } fn a() { let mut node = Node { elem: 5, next: None, }; let mut src = &mut node; {src}; src.next = None; //~ ERROR use of moved value: `src` [E0382] } fn b() { let mut src = &mut (22, 44); {src}; src.0 = 66; //~ ERROR use of moved value: `src` [E0382] } fn main() { a(); b(); }