Equality of ForwardRanges

[Tobias Pankrath]

Given:

void foo(Range)(Range fwdR)
    if(isForwardRange!Range)
{
     auto tmp = fwdR.save;
     assert(tmp == fwdR);
}

May I assume that the assert holds for generic forward range 
types?

Reason: I try to write an algorithm, that is easily implementable 
with random access ranges, but to make it work with forward 
ranges I need a comparison similar to the one above.