https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114304
--- Comment #21 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> --- The following may be a helpful read. https://www.ibm.com/docs/en/openxl-fortran-aix/17.1.2?topic=formatting-value-separators I am auditing our list_read.c code for the various types. The NULL read plays into this. The process is complicated further by the use of repeat counts in front of values.