The patch has passed regression testing on x86_64-*-freebsd.
It should be self-explanatory.  OK to commit?

2016-11-23  Steven G. Kargl  <ka...@gcc.gnu.org>

        PR fortran/78279
        * dependency.c (identical_array_ref): Convert gcc_assert to conditional
        and gfc_internal_error.

2016-11-23  Steven G. Kargl  <ka...@gcc.gnu.org>

        PR fortran/78279
        * gfortran.dg/pr78279.f90: New test.

Index: gcc/fortran/dependency.c
===================================================================
--- gcc/fortran/dependency.c    (revision 242789)
+++ gcc/fortran/dependency.c    (working copy)
@@ -101,7 +101,9 @@ identical_array_ref (gfc_array_ref *a1, 
 
   if (a1->type == AR_ELEMENT && a2->type == AR_ELEMENT)
     {
-      gcc_assert (a1->dimen == a2->dimen);
+      if (a1->dimen != a2->dimen)
+       gfc_internal_error ("identical_array_ref(): inconsistent dimensions");
+
       for (i = 0; i < a1->dimen; i++)
        {
          if (gfc_dep_compare_expr (a1->start[i], a2->start[i]) != 0)
Index: gcc/testsuite/gfortran.dg/pr78279.f90
===================================================================
--- gcc/testsuite/gfortran.dg/pr78279.f90       (nonexistent)
+++ gcc/testsuite/gfortran.dg/pr78279.f90       (working copy)
@@ -0,0 +1,10 @@
+! { dg-do compile }
+! { dg-options "-Ofast" }
+program p
+   integer :: i
+   real :: z(2,4)
+   z = 0.0
+   do i = 1, 3
+      if ( z(i) > z(1,i+1) ) print *, i   ! { dg-error "mismatch in array 
reference" }
+   end do
+end


-- 
Steve

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