Rust cookbook examples in need of :
https://github.com/brson/rust-cookbook/issues/240
https://github.com/brson/rust-cookbook/issues/241
https://github.com/brson/rust-cookbook/issues/242
https://github.com/brson/rust-cookbook/issues/243
https://github.com/brson/rust-cookbook/issues/244
https://github.com/brson/rust-cookbook/issues/245
https://github.com/brson/rust-cookbook/issues/222
https://github.com/brson/rust-cookbook/issues/216
https://github.com/brson/rust-cookbook/issues/215