{"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"types::I128"}]}
                    types::I128 => {
                let niche_start = match fx.bcx.func.dfg.value_type(tag) {
                        let lsb = fx.bcx.ins().iconst(types::I64, niche_start as u64 as i64);