Macro match_ast 

macro_rules! match_ast {
    (@arms($node:tt)
        $( $path:ident )::+ ($it:pat)
        $(if $guard:expr)?
        => $res:expr
        $(, $($t:tt)*)?
    ) => { ... };
    (@arms($node:expr) _ => $catch_all:expr $(,)?) => { ... };
    (match $node:tt {$($t:tt)+}) => { ... };
    ($i:ident $expr:tt) => { ... };
    (match $expr:tt {}) => { ... };
}

Match AST AstNode::cast()

Examples

match_ast!{match node {
    grammar::Rule(rule) => rule.name(),
    grammar::Slice(slice) => slice.name(),
    _ => unnamed(),
}}