{"ast_node_type":"variable","tokens":[{"end":87,"kind":"keyword","start":0,"text":"let"}]}
            let reason = if let PlaceBase::Upvar(upvar_id) = closure_kind_origin.base {
        if let Some((span, closure_kind_origin)) = tcx.closure_kind_origin(closure_local_def_id) {
                let upvar = ty::place_to_string_for_capture(tcx, closure_kind_origin);