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-rw-r--r--gcc/fortran/io.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/gcc/fortran/io.c b/gcc/fortran/io.c
index bb4295b..0bff511 100644
--- a/gcc/fortran/io.c
+++ b/gcc/fortran/io.c
@@ -2669,6 +2669,11 @@ if (condition) \
"REC tag at %L is incompatible with internal file",
&dt->rec->where);
+ io_constraint (dt->format_expr == NULL && dt->format_label == NULL
+ && dt->namelist == NULL,
+ "Unformatted I/O not allowed with internal unit at %L",
+ &dt->io_unit->where);
+
if (dt->namelist != NULL)
{
if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Internal file "