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diff --git a/gcc/testsuite/gfortran.dg/class_14.f03 b/gcc/testsuite/gfortran.dg/class_14.f03
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+! { dg-do compile }
+! Test the final fix for PR42353, in which a compilation error was
+! occurring because the derived type of the initializer of the vtab
+! component '$extends' was not the same as that of the component.
+!
+! Contributed by Harald Anlauf <anlauf@gmx.de>
+!
+module abstract_vector
+  implicit none
+
+  type, abstract :: vector_class
+  end type vector_class
+end module abstract_vector
+!-------------------------
+module concrete_vector
+  use abstract_vector
+  implicit none
+
+  type, extends(vector_class) :: trivial_vector_type
+  end type trivial_vector_type
+
+  private :: my_assign
+contains
+  subroutine my_assign (this,v)
+    class(trivial_vector_type), intent(inout) :: this
+    class(vector_class),        intent(in)    :: v
+  end subroutine my_assign
+end module concrete_vector
+!---------------------------
+module concrete_gradient
+  use abstract_vector
+  implicit none
+
+  type, abstract, extends(vector_class) :: gradient_class
+  end type gradient_class
+
+  type, extends(gradient_class) :: trivial_gradient_type
+  end type trivial_gradient_type
+
+  private :: my_assign
+contains
+  subroutine my_assign (this,v)
+    class(trivial_gradient_type), intent(inout) :: this
+    class(vector_class),          intent(in)    :: v
+  end subroutine my_assign
+end module concrete_gradient
+!----------------------------
+module concrete_inner_product
+  use concrete_vector
+  use concrete_gradient
+  implicit none
+end module concrete_inner_product
+! { dg-final { cleanup-modules "abstract_vector concrete_vector" } }
+! { dg-final { cleanup-modules "concrete_gradient concrete_inner_product" } }