error: Undefined Behavior: type validation failed: encountered 0x02, but expected a boolean --> $DIR/invalid_bool.rs:LL:CC | LL | let _b = unsafe { std::mem::transmute::(2) }; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered 0x02, but expected a boolean | = 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: inside `main` at $DIR/invalid_bool.rs:LL:CC note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace error: aborting due to previous error