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 penf_stringifyuse penfcharacter(128)::bb=bstr(n=1._R16P)print"(A)",b(17:)endprogram volatile_doctest