{"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"mspans.insert(dspan.open,"}]}
            mspans.insert(dspan.open, metavar_span)
        TokenTree::Delimited(dspan, ..) => with_metavar_spans(|mspans| {
                && mspans.insert(dspan.close, metavar_span)