{"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
                    let raw_val = dest_layout.size.truncate(discr_val);
                    let clif_ty = fx.clif_type(dest_layout.ty).unwrap();
                    fx.bcx.ins().iconst(clif_ty, raw_val as i64)