Macro test

macro_rules! test {
    ($($(#[$($attr:tt)+])* fn $name:ident() $body:block)*) => { ... };
    ($(other:tt)*) => { ... };
    (@meta_chain
        => [$($builtmeta:tt)*]
        {$should_panic:expr, $ignore:expr}
        fn $name:ident() $body:block
    ) => { ... };
    (@meta_chain
        [should_panic] $([$($rest:tt)+])* => [$($builtmeta:tt)*]
        {$should_panic:expr, $ignore:expr}
        fn $name:ident() $body:block
    ) => { ... };
    (@meta_chain
        [ignore] $([$($rest:tt)+])* => [$($builtmeta:tt)*]
        {$should_panic:expr, $ignore:expr}
        fn $name:ident() $body:block
    ) => { ... };
    (@meta_chain
        [$($first:tt)+] $([$($rest:tt)+])* => [$($builtmeta:tt)*]
        {$should_panic:expr, $ignore:expr}
        fn $name:ident() $body:block
    ) => { ... };
    (@final
        [$($builtmeta:tt)*]
        {$should_panic:expr, $ignore:expr}
        fn $name:ident() $body:block
    ) => { ... };
}