unhelpful debug messages on a crash

gistfile1.txt

$ rustc shootout-chameneos-redux.rs 
shootout-chameneos-redux.rs:225:11: 225:26 warning: value assigned to `second_creature` is never read
shootout-chameneos-redux.rs:225    let mut second_creature = { name: 0, color: Red }; // of initializing to junk?
                                           ^~~~~~~~~~~~~~~
$ 
$ 
$ RUST_LOG=shootout-chameneos-redux ./shootout-chameneos-redux 50
blue + blue -> blue
blue + red -> yellow
blue + yellow -> red
red + blue -> yellow
red + red -> red
red + yellow -> blue
yellow + blue -> red
yellow + red -> blue
yellow + yellow -> yellow

rust: ~"0"
rust: ~"1"
rust: ~"0"
rust: task failed at 'option none', shootout-chameneos-redux.rs:1
rust: ~"no data available on 140141160079328, going to sleep."
rust: ~"no data available on 140141160049824, going to sleep."
rust: domain main @0x1163bd0 root task failed
rust: ~"3"
rust: task failed at 'option none', shootout-chameneos-redux.rs:1
rust: task failed at 'killed', /code/rust/src/libcore/task.rs:513
rust: ~"woke up, p.state = 3"
rust: ~"woke up, p.state = 3"
rust: ~"3"
rust: ~"3"
rust: task failed at 'option none', shootout-chameneos-redux.rs:1
rust: task failed at 'option none', shootout-chameneos-redux.rs:1

That's with this source code: https://github.com/killerswan/chameneos-redux/blob/877eadea98a4698a512bf8325c8222ad400d4bac/shootout-chameneos-redux.rs

And the 4bb13c6 version of rustc (incoming).