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diff --git a/gcc/testsuite/gfortran.dg/argument_checking_8.f90 b/gcc/testsuite/gfortran.dg/argument_checking_8.f90
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+! { dg-do run }
+! PR31306 ICE with implicit character variables
+! Test case from PR and prepared by Jerry DeLisle <jvdelisle@gcc.gnu.org>
+module cyclic
+ implicit none
+ contains
+   character(10) function ouch(x,y)
+     implicit character(len(ouch)) (x)
+     implicit character(len(x)+1) (y)
+     intent(in) x,y
+     integer i
+     do i = 1, len(ouch)
+        ouch(i:i) = achar(ieor(iachar(x(i:i)),iachar(y(i:i))))
+     end do
+   end function ouch
+end module cyclic
+
+program test
+  use cyclic
+  implicit none
+  character(10) astr
+  integer i
+  write(astr,'(a)') ouch('YOW!      ','jerry      ')
+  if (astr(1:5) /= "3*%SY") call abort
+  do i=6,10
+    if (astr(i:i) /= achar(0)) call abort
+  end do    
+end program test
+! { dg-final { cleanup-modules "cyclic" } }