{"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let"}]}
                    let start = start.try_to_value()?.try_to_bits(tcx, typing_env)?;
                ty::PatternKind::Range { start, end } => {
                    let end = end.try_to_value()?.try_to_bits(tcx, typing_env)?;