error[E0381]: used binding `i` isn't initialized --> $DIR/borrowck-init-in-called-fn-expr.rs:4:9 | LL | let i: isize; | - binding declared here but left uninitialized LL | i | ^ `i` used here but it isn't initialized | help: consider assigning a value | LL | let i: isize = 0; | +++ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0381`.