{"ast_node_type":"variable","tokens":[{"end":80,"kind":"keyword","start":0,"text":"let"}]}
                let cast_tag = clif_intcast(fx, relative_discr, cast_to, false);
                let relative_discr = fx.bcx.ins().isub(tag, niche_start);
                let is_niche = crate::common::codegen_icmp_imm(