Nodes of different colours represent the following:
Solid arrows point from a procedure to one which it calls. Dashed
arrows point from an interface to procedures which implement that interface.
This could include the module procedures in a generic interface or the
implementation in a submodule of an interface in a parent module.
SUBROUTINE assert4(n1,n2,n3,n4,string)CHARACTER(LEN=*),INTENT(IN)::stringLOGICAL,INTENT(IN)::n1,n2,n3,n4if(.not.(n1.and.n2.and.n3.and.n4))then write(*,*)'nrerror: an assertion failed with this tag:',&stringSTOP'program terminated by assert4'end if END SUBROUTINE assert4