rust-lang/rust — pull request #17366 by ohazi (2014-09-18 07:58:12+00:00)
Title: from_str has an impl for uint, not Option<uint>

See: http://doc.rust-lang.org/std/from_str/trait.FromStr.html
```
let input_num = from_str::>("5");
```
```
:2:21: 2:45 error: failed to find an implementation of trait std::from_str::FromStr for core::option::Option
:2 let input_num = from_str::>("5");
^~~~~~~~~~~~~~~~~~~~~~~~
```