Fix for rust commit 3dcd2157403163789aaf21a9ab3c4d30a7c6494d 'Switch to purely namespaced enums'
Update for changes to rust-encoding
Merge pull request #47 from CraZySacX/master

Fix for rust commit 3dcd2157403163789aaf21a9ab3c4d30a7c6494d 'Switch to ...
Rust update.

`[T, ..n]` used to coerce to `&[T]` but it must now be done manually.
Merge pull request #48 from chris-morgan/master

Rust update: no more `[T, ..n]` -> `&[T]` coercion