@example
>> 4
ans =  4
@end example

@example
>> ans
ans =  4
@end example

@example
>> 5                @c doctest: +SKIP
ans =  5
@end example

@example
>> ans
ans =  4
@end example

@example
>> 6                @c doctest: +XFAIL
ans =  7
@end example

@example
>> ans
ans =  6
@end example
