```
compile_and_link: x86_64-unknown-linux-gnu/stage0/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd
/home/clark/development/rust/rust/src/libstd/hashmap.rs:1233:9: 1238:15 error: failed to find an implementation of trait to_bytes::IterBytes for K
/home/clark/development/rust/rust/src/libstd/hashmap.rs:1233         for _ in self {}
/home/clark/development/rust/rust/src/libstd/hashmap.rs:1234 
/home/clark/development/rust/rust/src/libstd/hashmap.rs:1235         // Don't let destructors run twice! Without these, the vector destructor
/home/clark/development/rust/rust/src/libstd/hashmap.rs:1236         // will try to destruct all the elements (which are now uninitalized),
/home/clark/development/rust/rust/src/libstd/hashmap.rs:1237         // and we will be very sad.
/home/clark/development/rust/rust/src/libstd/hashmap.rs:1238         unsafe {
```

Any ideas?