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.
Source Code
program volatile_doctestuse befor64use befor64use penfcharacter(:),allocatable::code64code64=repeat(' ',5)call b64_decode(code='aGVsbG8=',s=code64)print"(L1)",code64=='hello'endprogram volatile_doctest