Steven Fackler eb0473df93 Make Result::{unwrap, unwrap_err} require Show
`foo.ok().unwrap()` and `foo.err().unwrap()` are the fallbacks for types
that aren't `Show`.

Closes #13379
2014-04-13 23:47:53 -07:00
..
2014-04-06 15:39:56 -07:00