[patch, committed] PR84779 New test case

[Jerry D]

Committed to avoid future regression. See

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84779
commit d0128de52fc637efd768d28dbd4edb7bc680a97b (HEAD -> master, origin/master, 
origin/HEAD)
Author: Christopher Albert <alb...@tugraz.at>
Date:   Wed Mar 11 00:19:25 2026 +0100

    fortran: Add testcase [PR84779]

    The reproducer from the bug report compiles cleanly on current
    trunk.  Add a testcase to prevent future regressions.

            PR fortran/84779

    gcc/testsuite/ChangeLog:

            PR fortran/84779
            * gfortran.dg/pr84779.f90: New test.

    Signed-off-by: Christopher Albert <alb...@tugraz.at>