For g77 backward compatibility arrays of strings need to be implemented, as the
following code doesn't compile otherwise:
data chnum /'0','1','2','3','4','5','6','7','8','9'/
this is a regression towards g77.
Basically another dup of Bug 13253.
Leaving it open because it also involves initialization via a DATA statement.
*** Bug 14727 has been marked as a duplicate of this bug. ***