error[E0381]: used binding `y` isn't initialized --> $DIR/privately-uninhabited-mir-call.rs:28:5 | LL | let y: &mut u32; | - binding declared here but left uninitialized ... LL | *y = 2; | ^^^^^^ `y` used here but it isn't initialized | help: consider assigning a value | LL | let y: &mut u32 = todo!(); | +++++++++ error: aborting due to previous error For more information about this error, try `rustc --explain E0381`.