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diff --git a/gcc/testsuite/gfortran.dg/ambiguous_reference_1.f90 b/gcc/testsuite/gfortran.dg/ambiguous_reference_1.f90
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+! { dg-do compile }
+! Tests the fix for PR33550, in which an ICE would occur, instead of
+! the abiguous reference error.
+!
+! Found at
+! http://groups.google.com/group/comp.lang.fortran/browse_thread/thread/1abc1549a6a164f1/
+! by James Van Buskirk:
+!
+module M1
+   real x
+end module M1
+
+module M2
+   contains
+      subroutine y
+      end subroutine y
+end module M2
+
+module M3
+   use M2, x => y
+end module M3
+
+module M4
+   use M1
+   use M3
+end module M4
+
+module M5
+   use M4             ! 'x' is ambiguous here but is not referred to
+end module M5
+
+module M6
+   use M5             ! ditto
+end module M6
+
+program test
+   use M1
+   use M3
+   interface
+      function x(z)   ! { dg-error "ambiguous reference" }
+      end function x  ! { dg-error "Expecting END INTERFACE" }
+   end interface
+
+   write(*,*) 'Hello, world!'
+end program test
+
+function x(z)
+   x = z
+end function x
+! { dg-final { cleanup-modules "m1 m2 m3 m4 m5 m6" } }