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/// Trait to implement the `.toogle()` method, to switch between two values
///
/// ## Exemple
/// ```rust
/// use toogle::Toggle;
///
/// #[derive(PartialEq, Eq)]
/// pub enum TwoEnum {
/// Value1, Value2
/// };
///
/// impl Toggle for TwoEnum {
/// fn toggle(&mut self) {
/// *self = match *self {
/// TwoEnum::Value1 => TwoEnum::Value2,
/// TwoEnum::Value2 => TwoEnum::Value1,
/// }
/// }
/// }
///
/// ```