--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gfortran.dg/extends_7.f03	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,23 @@
+! { dg-do compile }
+! Check for re-definition of inherited components in the sub-type.
+
+MODULE m1
+  IMPLICIT NONE
+
+  TYPE supert
+    INTEGER :: c1
+    INTEGER, PRIVATE :: c2
+  END TYPE supert
+
+END MODULE m1
+
+MODULE m2
+  USE m1 ! { dg-error "already in the parent type" }
+  IMPLICIT NONE
+
+  TYPE, EXTENDS(supert) :: subt
+    INTEGER :: c1 ! { dg-error "already in the parent type" }
+    INTEGER :: c2 ! { dg-error "already in the parent type" }
+  END TYPE subt
+
+END MODULE m2