The reason is that joiner does not only consume its range argument, it
eats every item of every item of the range argument (which must be a
range of ranges). Therefore, it destructively chews through its input.
Andrei
David Simcha wrote:
Why is std.algorithm.joiner explicitly *not* a forward range even when
it can be? This is not an oversight. It appears to be an explicit
decision. From the unittest:
static assert(isInputRange!(typeof(joiner([""], ""))));
static assert(!isForwardRange!(typeof(joiner([""], ""))));
Maybe I'm missing something obvious, but I just can't think of any good
reason for this decision.
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