Macro statements need semicolons now.

[csouth3]

Trying to compile collect with rustc-dev at current HEAD (commit 840de0720) results in:

/home/csouth3/.cargo/registry/src/garden.eu.org-1ecc6299db9ec823/collect-0.0.5/src/iter/ordered_iter.rs:311:9: 311:18 error: expected one of `.`, `;`, or `}`, found `assert_eq`
/home/csouth3/.cargo/registry/src/garden.eu.org-1ecc6299db9ec823/collect-0.0.5/src/iter/ordered_iter.rs:311         assert_eq!(Some((12, 6, 4)), powers_of_two_and_three.next())
                                                                                                                 ^~~~~~~~~
Could not compile `collect`.

This is because rust-lang/rust#19984 makes it so that macros being used as statements need to be terminated by semicolons.