--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gfortran.dg/interface_23.f90	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,33 @@
+! { dg-do compile }
+!
+! This tests the fix for PR36325, which corrected for the fact that a
+! specific or generic INTERFACE statement implies the EXTERNAL attibute.
+!
+! Contributed by Janus Weil <janus@gcc.gnu.org>
+
+module a
+  interface
+    subroutine foo
+    end subroutine
+  end interface
+  external foo  ! { dg-error "Duplicate EXTERNAL attribute" }
+end module
+
+module b
+  interface
+    function sin (x)
+      real :: sin, x
+    end function
+  end interface
+  intrinsic sin  ! { dg-error "EXTERNAL attribute conflicts with INTRINSIC attribute" }
+end module
+
+! argument checking was not done for external procedures with explicit interface
+program c
+  interface
+    subroutine bar(x)
+      real :: x
+    end subroutine
+  end interface
+  call bar()  ! { dg-error "Missing actual argument" }
+end program