error: Undefined Behavior: overflow executing `unchecked_sub` --> $DIR/unchecked_sub2.rs:LL:CC | LL | let _val = unsafe { 30000i16.unchecked_sub(-7000) }; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ overflow executing `unchecked_sub` | = 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_sub2.rs:LL:CC note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace error: aborting due to previous error