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diff --git a/gcc/testsuite/gfortran.dg/interface_28.f90 b/gcc/testsuite/gfortran.dg/interface_28.f90
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+! { dg-do compile }
+!
+! PR 36947: Attributes not fully checked comparing actual vs dummy procedure
+!
+! Contributed by Walter Spector <w6ws@earthlink.net>
+
+module testsub
+  contains
+  subroutine test(sub)
+    interface
+      subroutine sub(x)
+        integer, intent(in), optional:: x
+      end subroutine
+    end interface
+    print *, "In test(), about to call sub()"
+    call sub()
+  end subroutine
+end module
+
+module sub
+  contains
+  subroutine subActual(x)
+    ! actual subroutine's argment is different in intent and optional
+    integer, intent(inout):: x
+    print *, "In subActual():", x
+  end subroutine
+end module
+
+program interfaceCheck
+  use testsub
+  use sub
+
+  integer :: a
+
+  call test(subActual)  ! { dg-error "Type/rank mismatch in argument" }
+end program
+
+! { dg-final { cleanup-modules "sub testsub" } }
+