error: Undefined Behavior: overflow executing `unchecked_mul` --> $DIR/unchecked_mul2.rs:LL:CC | LL | let _val = unsafe { 1_000_000_000i32.unchecked_mul(-4) }; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ overflow executing `unchecked_mul` | = 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/unchecked_mul2.rs:LL:CC note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace error: aborting due to previous error