error: Undefined Behavior: writing to ALLOC which is read-only --> $DIR/modifying_constants.rs:LL:CC | LL | *y = 42; | ^^^^^^^ writing to ALLOC which is read-only | = 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/modifying_constants.rs:LL:CC note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace error: aborting due to previous error