{"ast_node_type":"function","tokens":[{"end":93,"kind":"keyword","start":0,"text":"$(fn"}]}
        $(fn $method(&mut self, node: &$lt $ty $(, $extra_name:$extra_ty)?) -> Self::Result {
    ) => {
            impl_visitable!(|&$lt self: $ty, visitor: &mut V, extra: ($($extra_ty)?)| {