error[E0381]: used binding `bar` isn't initialized --> $DIR/borrowck-uninit-after-item.rs:4:9 | LL | let bar; | --- binding declared here but left uninitialized LL | fn baz(_x: isize) { } LL | baz(bar); | ^^^ `bar` used here but it isn't initialized | help: consider assigning a value | LL | let bar = 0; | +++ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0381`.