Nodes of different colours represent the following:
Solid arrows point from a file to a file which depends upon it. 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(len=:), allocatable :: code64 call b64_encode(n=2023_I4P, code=code64) print "(A)", code64 endprogram volatile_doctest