I think this caused:
FAIL: gfortran.dg/io_constraints_8.f90 -O (test for errors, line 64)
FAIL: gfortran.dg/io_constraints_8.f90 -O (test for errors, line 65)
FAIL: gfortran.dg/io_constraints_8.f90 -O (test for errors, line 66)
FAIL: gfortran.dg/io_constraints_8.f90 -O (test for errors, line 67)
FAIL: gfortran.dg/io_constraints_8.f90 -O (test for errors, line 68)
FAIL: gfortran.dg/io_constraints_8.f90 -O (test for errors, line 70)
FAIL: gfortran.dg/io_constraints_8.f90 -O (test for errors, line 71)
FAIL: gfortran.dg/io_constraints_8.f90 -O (test for excess errors)
on 4.8 branch on Linux/x86-32.