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 befor64 use befor64 use penf character(:), allocatable :: code64 code64 = repeat(' ',5) call b64_decode(code='aGVsbG8=',s=code64) print "(L1)", code64=='hello' endprogram volatile_doctest