0a1,2
> ///! Version of main.rs with no dependancies, for compiling with rustc 1.14.1 on otter
> ///! compile with `build.sh`
7c9,12
< use derive_more::{Add, AddAssign, Sub, SubAssign};
---
> use std::u16;
> 
> // Macros we could use on Addr, but don't because otter doesn't have cargo.
> // use derive_more::{Add, AddAssign, Sub, SubAssign};
11c16
< #[derive(Default, Copy, Clone, Add, AddAssign, Sub, SubAssign)]
---
> #[derive(Default, Copy, Clone)] //, Add, AddAssign, Sub, SubAssign
21c26
<         addr.0.0
---
>         (addr.0).0
26c31
<         addr.0.0 as usize
---
>         (addr.0).0 as usize
37c42,71
<         f.write_fmt(format_args!("{:#04x}", self.0.0))
---
>         f.write_fmt(format_args!("{:#04x}", (self.0).0))
>     }
> }
> 
> // Could use derive_more instead of manual impl, but cargo isn't installed on the lab machines :(
> // (these impl's were generated by `cargo expand`)
> impl ::core::ops::Add for Addr {
>     type Output = Addr;
>     #[inline]
>     fn add(self, rhs: Addr) -> Addr {
>         Addr(self.0.add(rhs.0))
>     }
> }
> impl ::core::ops::AddAssign for Addr {
>     #[inline]
>     fn add_assign(&mut self, rhs: Addr) {
>         self.0.add_assign(rhs.0);
>     }
> }
> impl ::core::ops::Sub for Addr {
>     type Output = Addr;
>     #[inline]
>     fn sub(self, rhs: Addr) -> Addr {
>         Addr(self.0.sub(rhs.0))
>     }
> }
> impl ::core::ops::SubAssign for Addr {
>     #[inline]
>     fn sub_assign(&mut self, rhs: Addr) {
>         self.0.sub_assign(rhs.0);