The following is a common vendor extension but to my knowledge not allowed up to Fortran 2003 (and probably also Fortran 2008):
write(*,*), 'Hello' read(*,*), a end gfortran -pedantic -std=f95 -Wall accepts simply accepts it. ifort -stand f03 reports correctly: fortcom: Warning: a.f90, line 1: Use of comma to separate io-access spec and io_list is non_standard. write(*,*), 'Hello' ----------^ fortcom: Warning: a.f90, line 2: Use of comma to separate io-access spec and io_list is non_standard. read(*,*), a ---------^ -- Summary: Diagnose comma in "read()," and "write()," Product: gcc Version: 4.3.0 Status: UNCONFIRMED Keywords: diagnostic Severity: normal Priority: P3 Component: fortran AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: burnus at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33232