The rules stated in section 14.7 of the Fortran 90 standard will apply to variables defined in HPF_SERIAL scoping units. In particular, if the definition status, association status, or allocation status of a variable is defined upon execution of a RETURN statement or an END statement in a Fortran 90 subprogram, such a variable in an HPF_SERIAL subprogram will be defined upon execution of a RETURN statement or an END statement.
As is the case with HPF_LOCAL, any I/O performed within an HPF_SERIAL subprogram, and the correspondence of file names and unit numbers used to those used in global HPF and HPF_LOCAL code will be implementation-defined.