error[E0381]: used binding `i` is possibly-uninitialized --> $DIR/borrowck-or-init.rs:5:20 | LL | let i: isize; | - binding declared here but left uninitialized LL | LL | println!("{}", false || { i = 5; true }); | ----- binding initialized here in some conditions LL | println!("{}", i); | ^ `i` used here but it is possibly-uninitialized | = note: this error originates in the macro `$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`.