std: rename fmt::Default to `Show`.
This is a better name with which to have a #[deriving] mode. Decision in: https://github.com/mozilla/rust/wiki/Meeting-weekly-2014-01-28
Showing
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This is a better name with which to have a #[deriving] mode. Decision in: https://github.com/mozilla/rust/wiki/Meeting-weekly-2014-01-28