program volatile_doctest use stringifor_string_t type(string) :: astring logical :: test_passed(4) astring = 'this is string example....wow!!!' test_passed(1) = astring%fill(width=40)//''=='00000000this is string example....wow!!!' test_passed(2) = astring%fill(width=50)//''=='000000000000000000this is string example....wow!!!' test_passed(3) = astring%fill(width=50, right=.true.)//''=='this is string example....wow!!!000000000000000000' test_passed(4) = astring%fill(width=40, filling_char='*')//''=='********this is string example....wow!!!' print '(L1)', all(test_passed) endprogram volatile_doctest