Macro aspen::AlwaysFail
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macro_rules! AlwaysFail { ( $e:expr ) => { ... }; ( ) => { ... }; }
Convenience macro for creating AlwaysFail nodes.
Examples
Without a child:
let fail: Node<()> = AlwaysFail!{};
With a child:
let fail_child = AlwaysFail!{ Condition!{ |a: &u32| *a < 12 } };