Nodes of different colours represent the following:
Solid arrows point from a file to a file which it depends on. A file is dependent upon another if the latter must be compiled before the former can be.
program volatile_doctest use stringifor_string_t type(string) :: astring logical :: test_passed(2) astring = ' -1212112.3 ' test_passed(1) = astring%is_digit().eqv..false. astring = '12121123' test_passed(2) = astring%is_digit().eqv..true. print '(L1)', all(test_passed) endprogram volatile_doctest