{"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"let"}]}
            let Expr { id, kind, span, attrs, tokens: _ } = self;
        impl_walkable!(|&$($mut)? $($lt)? self: Expr, vis: &mut V| {
            visit_visitable!($($mut)? vis, id, attrs);