mismatch

Tuple!(Ranges) mismatch(alias  pred = (a,  b)  =>  a ==  b,  Ranges...)(Ranges rs) if (rs.length >=  2 &&  allSatisfy!(isInputRange,  Ranges))

Sequentially compares elements in rs in lockstep, and stops at the first mismatch (according to pred, by default equality). Returns a tuple with the reduced ranges that start with the two mismatched values. Performs min(r0.length, r1.length, ...) evaluations of pred.