As of Fortran 2018 it's allowed to open the same file on multiple
units.
libgfortran/ChangeLog:
2019-05-15 Janne Blomqvist <jb@gcc.gnu.org>
PR fortran/90461
* io/open.c (new_unit): Don't check if the file is already open
for F2018.
testsuite/ChangeLog:
2019-05-15 Janne Blomqvist <jb@gcc.gnu.org>
PR fortran/90461
* gfortran.dg/open_errors_2.f90: Add -std=f2008, adjust line number.
* gfortran.dg/open_errors_3.f90: New test.
From-SVN: r271260