random access-range without lower-power range kinds?

[spir]

Hello,

It seems impossible to define a random-access range (opIndex + length) alone. In fact, I cannot have it used by the language. Am I missing something?
Random-access looks enough to provide fonctionality for both input and bidirectional ranges without any additional method. "Lowering" for forward iteration means I guess ;-)
	for (uint i=0 ; i < coll.length ; i++) {
	    element = coll[i];
	    doSomethingWith(element);
	}
What is the reason for requiring methods of lower-power range types to be defined? (This makes 5 methods!)

Denis
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vit esse estrany ☣

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