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FEATURE_MATCH

Macro FEATURE_MATCH 

Source
macro_rules! FEATURE_MATCH {
    ($($feature:ident => $expr:expr),+ , * => $default:expr $(,)?) => { ... };
    ($($feature:ident => $expr:expr),+ , _ => $default:expr $(,)?) => { ... };
    ($($feature:ident => $expr:expr),+ $(,)?) => { ... };
}