811 	return rangeValue{start: start, stop: stop, step: step, len: rangeLen(start, stop, step)}, nil
817 type rangeValue struct{ start, stop, step, len int }  argument
820 	_ Indexable  = rangeValue{}
821 	_ Sequence   = rangeValue{}
822 	_ Comparable = rangeValue{}
823 	_ Sliceable  = rangeValue{}
826 func (r rangeValue) Len() int          { return r.len }  argument
827 func (r rangeValue) Index(i int) Value { return MakeInt(r.start + i*r.step) }  argument
828 func (r rangeValue) Iterate() Iterator { return &rangeIterator{r, 0} }  argument
848 func (r rangeValue) Slice(start, end, step int) Value {  argument
852 	return rangeValue{
860 func (r rangeValue) Freeze() {} // immutable  argument
861 func (r rangeValue) String() string {  argument
870 func (r rangeValue) Type() string          { return "range" }  argument
871 func (r rangeValue) Truth() Bool           { return r.len > 0 }  argument
872 func (r rangeValue) Hash() (uint32, error) { return 0, fmt.Errorf("unhashable: range") }  argument
874 func (x rangeValue) CompareSameType(op syntax.Token, y_ Value, depth int) (bool, error) {  argument
875 	y := y_.(rangeValue)
886 func rangeEqual(x, y rangeValue) bool {  argument
900 func (r rangeValue) contains(x Int) bool {  argument
911 	r rangeValue