{"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
        let mut vars = DenseBitSet::new_empty(mir.source_scopes.len());
    let variables = if cx.sess().opts.debuginfo == DebugInfo::Full {
        // FIXME(eddyb) take into account that arguments always have debuginfo,