error[E0381]: used binding `v` is possibly-uninitialized --> $DIR/borrowck-while-break.rs:7:20 | LL | let v; | - binding declared here but left uninitialized LL | while cond { | ---- if this condition isn't met and the `while` loop runs 0 times, `v` is not initialized ... LL | println!("{}", v); | ^ `v` used here but it is possibly-uninitialized | = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info) error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0381`.