{"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"fx.bcx.ins().iconst(cast_to,"}]}
                    fx.bcx.ins().iconst(cast_to, niche_variants.start().as_u32() as i64);
                let tagged_discr =
                (is_niche, tagged_discr, 0)