{"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"MetaVarExpr::Concat(ref"}]}
        MetaVarExpr::Concat(ref elements) => metavar_expr_concat(tscx, dspan, elements)?,
    let tt = match *expr {
        MetaVarExpr::Count(original_ident, depth) => {