--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gfortran.dg/extends_13.f03	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,28 @@
+! { dg-do compile }
+!
+! PR 47601: [OOP] Internal Error: mio_component_ref(): Component not found
+!
+! Contributed by Rich Townsend <townsend@astro.wisc.edu>
+
+module type_definitions
+  implicit none
+  type :: matching 
+     integer :: n = -999
+  end type
+  type, extends(matching) :: ellipse
+  end type
+end module type_definitions
+
+module elliptical_elements
+  implicit none
+contains
+  function line(e) result(a2n)
+    use type_definitions
+    type(ellipse), intent(in) :: e
+    complex, dimension(e%N) :: a2n   ! <- change "e%N" to "10" 
+  end function line
+end module
+
+  use type_definitions
+  use elliptical_elements
+end