## Function: COMMON-LISP:MISMATCH
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> The specified subsequences of SEQUENCE1 and SEQUENCE2 are compared
> element-wise. If they are of equal length and match in every element, the
> result is NIL. Otherwise, the result is a non-negative integer, the index
> within SEQUENCE1 of the leftmost position at which they fail to match; or,
> if one is shorter than and a matching prefix of the other, the index within
> SEQUENCE1 beyond the last position tested is returned. If a non-NIL
> :FROM-END argument is given, then one plus the index of the rightmost
> position in which the sequences differ is returned.

### Lambda list
```cl
(sb-impl::sequence1 sb-impl::sequence2 &rest sb-impl::args &key sb-impl::from-end
 sb-impl::test sb-impl::test-not sb-impl::start1 sb-impl::end1 sb-impl::start2
 sb-impl::end2 sb-impl::key)
```