objc2 0.6.4

Objective-C interface and runtime bindings
Documentation 
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#[doc(hidden)]
#[macro_export]
macro_rules! __fallback_if_not_set {
    (
        ()
        ($($fallback:tt)*)
    ) => {
        $($fallback)*
    };
    (
        ($($actual:tt)+)
        ($($_fallback:tt)*)
    ) => {
        $($actual)+
    };
}