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The semantics of a bidirectional range (not checkable during
compilation) are assumed to be the following (
r is an object of
rreturns (possibly a reference to) the last element in the range. Calling
ris allowed only if calling
rhas, or would have, returned
enum isBidirectionalRange(R) = isForwardRange!R && is(typeof((R r) => r
.popBack)) && is(ReturnType!((R r) => r .back) == ElementType!R);