isAggregate := func(t *types.Type) bool {
		return t.IsStruct() || t.IsArray() || t.IsComplex() || t.IsInterface() || t.IsString() || t.IsSlice()
	}

	wOff := 0
	n := 0
	writebyte := func(o uint8) { wOff = objw.Uint8(x, wOff, o) }

	// Write one non-aggregate arg/field/element.
	write1 := func(sz, offset int64) {
		if offset >= rtabi.TraceArgsSpecial {
			writebyte(rtabi.TraceArgsOffsetTooLarge)