Example

```rust

[macro_use]

extern crate derivetryfrom_primitive;

[derive(TryFromPrimitive)]

[repr(u16)]

enum Foo { Bar, Baz = 100, Quix = 200, }

fn main() { let bar = Foo::tryfrom(0); let baz = Foo::tryfrom(100); let quix = Foo::tryfrom(200); let bad = Foo::tryfrom(300); asserteq!(bar.unwrap() as u16, 0); asserteq!(baz.unwrap() as u16, 100); asserteq!(quix.unwrap() as u16, 200); assert!(bad.isnone()); } ```