Steven Fackler 4037f2a368 Update debug helpers and add list builder
The collections debug helpers no longer prefix output with the
collection name, in line with the current conventions for Debug
implementations. Implementations that want to preserve the current
behavior can simply add a `try!(write!(fmt, "TypeName "));` at the
beginning of the `fmt` method.

[breaking-change]
2015-03-28 10:33:51 -07:00
..