fix the copy impl for Registers

src/arch.rs

@@ -8,12 +8,12 @@ use stack::Stack;
 #[allow(non_camel_case_types)]
 pub type uintptr_t = u64;
 
+#[allow(raw_pointer_derive)]
+#[derive(Copy, Clone)]
 pub struct Registers {
   rsp: *mut uintptr_t
 }
 
-impl Copy for Registers {}
-
 #[inline(always)]
 pub unsafe fn swap(regs: &mut Registers) {
   asm!(include_str!("swap.s")