error: Undefined Behavior: using uninitialized data, but this operation requires initialized memory --> $DIR/uninit_byte_read.rs:LL:CC | LL | let undef = unsafe { *v.get_unchecked(5) }; | ^^^^^^^^^^^^^^^^^^^ using uninitialized data, but this operation requires initialized memory | = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information = note: backtrace: = note: inside `main` at $DIR/uninit_byte_read.rs:LL:CC note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace error: aborting due to previous error