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 integer_to_string(i,s)integer,intent(in),optional::i!! integer valuecharacter(len=*),intent(out)::s!! integer value stringifiedinteger::istat!! IO statuswrite(s,int_fmt,iostat=istat)iif(istat/=0)thenerrorstop'Error converting integer to string'elses=adjustl(s)end if end subroutine integer_to_string