rust/tests/ui/moves/move-of-addr-of-mut.rs

// Ensure that taking a mutable raw ptr to an uninitialized variable does not change its
// initializedness.

struct S;

fn main() {
    let mut x: S;
    std::ptr::addr_of_mut!(x); //~ ERROR E0381

    let y = x; // Should error here if `addr_of_mut` is ever allowed on uninitialized variables
    drop(y);
}
Sanity check for move from an uninit variable whose address is taken 2021-11-11 16:55:58 -06:00			`// Ensure that taking a mutable raw ptr to an uninitialized variable does not change its`
			`// initializedness.`

			`struct S;`

			`fn main() {`
			`let mut x: S;`
On partial uninit error point at where we need init When a binding is declared without a value, borrowck verifies that all codepaths have one assignment to them to initialize them fully. If there are any cases where a condition can be met that leaves the binding uninitialized or we attempt to initialize a field of an unitialized binding, we emit E0381. We now look at all the statements that initialize the binding, and use them to explore branching code paths that don't and point at them. If we find no potential places where an assignment to the binding might be missing, we display the spans of all the existing initializers to provide some context. 2022-06-21 13:57:45 -05:00			`std::ptr::addr_of_mut!(x); //~ ERROR E0381`
Sanity check for move from an uninit variable whose address is taken 2021-11-11 16:55:58 -06:00
			let y = x; // Should error here if `addr_of_mut` is ever allowed on uninitialized variables
			`drop(y);`
			`}`