program volatile_doctest use stringifor_string_t type(string) :: string1 logical :: test_passed(2) string1 = 'llo' test_passed(1) = scan(s='Hello World Hello!', set=string1)==scan(string='Hello World Hello!', set='llo') test_passed(2) = scan(s='Hello World Hello!', set=string1, back=.true.)==scan(string='Hello World Hello!', & set='llo', back=.true.) print '(L1)', all(test_passed) endprogram volatile_doctest