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diff --git a/gcc/testsuite/gfortran.dg/interface_7.f90 b/gcc/testsuite/gfortran.dg/interface_7.f90
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+++ b/gcc/testsuite/gfortran.dg/interface_7.f90
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+! { dg-do compile }
+! One of the tests of the patch for PR30068.
+!  Taken from the fortran 2003 standard C11.2.
+!
+! The interface is invalid although it is unambiguous because the
+! standard explicitly does not require recursion into the formal
+! arguments of procedures that themselves are interface arguments.
+!
+module xx
+  INTERFACE BAD9
+    SUBROUTINE S9A(X)
+      REAL :: X
+    END SUBROUTINE S9A
+    SUBROUTINE S9B(X)
+      INTERFACE
+        FUNCTION X(A)
+          REAL :: X,A
+        END FUNCTION X
+      END INTERFACE
+    END SUBROUTINE S9B
+    SUBROUTINE S9C(X)
+      INTERFACE
+        FUNCTION X(A)
+          REAL :: X
+          INTEGER :: A
+        END FUNCTION X
+      END INTERFACE
+    END SUBROUTINE S9C  ! { dg-error "Ambiguous interfaces" }
+  END INTERFACE BAD9
+end module xx
+
+! { dg-final { cleanup-modules "xx" } }