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 astring = 'Hello World! ' print "(L1)", astring%len_trim()==len_trim('Hello World! ') endprogram volatile_doctest