Alignment is hard.

gistfile1.rs

enum NewType<T> = T;
struct UnAligned<T> { a: u8, b: T }

fn main() {
    unsafe {
        let p: *UnAligned<u32> = ptr::null();
        io::println(fmt!("%?", ptr::addr_of(&(*p).b) as uint));
    }
    unsafe {
        let p: *UnAligned<NewType<u32>> = ptr::null();
        io::println(fmt!("%?", ptr::addr_of(&(*p).b) as uint));
    }
}