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-rw-r--r--libgfortran/io/transfer.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/libgfortran/io/transfer.c b/libgfortran/io/transfer.c
index b8db47d..d071c1c 100644
--- a/libgfortran/io/transfer.c
+++ b/libgfortran/io/transfer.c
@@ -4123,6 +4123,14 @@ finalize_transfer (st_parameter_dt *dtp)
if ((dtp->u.p.ionml != NULL)
&& (cf & IOPARM_DT_HAS_NAMELIST_NAME) != 0)
{
+ if (dtp->u.p.current_unit->flags.form == FORM_UNFORMATTED)
+ {
+ generate_error (&dtp->common, LIBERROR_OPTION_CONFLICT,
+ "Namelist formatting for unit connected "
+ "with FORM='UNFORMATTED");
+ return;
+ }
+
dtp->u.p.namelist_mode = 1;
if ((cf & IOPARM_DT_NAMELIST_READ_MODE) != 0)
namelist_read (dtp);