error: Undefined Behavior: constructing invalid value: encountered invalid reference metadata: total size is bigger than largest supported object --> $DIR/too-big-unsized.rs:LL:CC | LL | let _x: &MySlice = mem::transmute((ptr, isize::MAX as usize)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered invalid reference metadata: total size is bigger than largest supported object | = 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/too-big-unsized.rs:LL:CC note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace error: aborting due to previous error