error[E0381]: used binding `x` isn't initialized --> $DIR/borrowck-break-uninit-2.rs:9:20 | LL | let x: isize; | - binding declared here but left uninitialized ... LL | println!("{}", x); | ^ `x` used here but it isn't initialized | = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info) help: consider assigning a value | LL | let x: isize = 0; | +++ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0381`.