[Bug fortran/80484] Three syntax errors involving derived-type I/O

["jvdelisle at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80484

--- Comment #7 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Created attachment 41246
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41246&action=edit
Preliminary patch for testing

This patch takes care of the rejected format with a repeat in front of the DT
and the '/' inserted after.  I am still testing and exploring the business with
the USE statement.

Note: I have not checked to make sure the runtime also handles the repeat
correctly.  This is a work in progress. I am suspicious of this patch since I
expected the unget_char to be sufficient and the lexing would cycle around and
catch that '/'. Obviously it does not, but I do want to understand why not. I
do understand why the repeat digit was missed and that part is good. (Helps if
you put the new code in the right place, ;) )