{"ast_node_type":"function","tokens":[{"end":105,"kind":"keyword","start":0,"text":"fn"}]}
            fn visit_ident(&mut self, Ident { name: _, span }: &$($lt)? $($mut)? Ident) -> Self::Result {
            // forget to add handling for it.
                impl_visitable!(|&$($lt)? $($mut)? self: Ident, visitor: &mut V, _extra: ()| {