error[E0080]: it is undefined behavior to use this value --> $DIR/issue-83182.rs:7:1 | LL | const MYSTR_NO_INIT: &MyStr = unsafe { mem::transmute::<&[_], _>(&[&()]) }; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ unable to turn pointer into raw bytes | = help: this code performed an operation that depends on the underlying bytes representing a pointer = help: the absolute address of a pointer is not known at compile-time, so such operations are not supported = note: the raw bytes of the constant (size: $SIZE, align: $ALIGN) { HEX_DUMP } error: aborting due to previous error For more information about this error, try `rustc --explain E0080`.