{"ast_node_type":"variable","tokens":[{"end":40,"kind":"keyword","start":0,"text":"let"}]}
    let val = fx.bcx.ins().isub(gt, lt);
    let lt = fx.bcx.ins().icmp(lt_cc, lhs, rhs);
    CValue::by_val(val, fx.layout_of(fx.tcx.ty_ordering_enum(fx.mir.span)))