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diff --git a/gcc/testsuite/gfortran.dg/userdef_operator_2.f90 b/gcc/testsuite/gfortran.dg/userdef_operator_2.f90
new file mode 100644
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+++ b/gcc/testsuite/gfortran.dg/userdef_operator_2.f90
@@ -0,0 +1,17 @@
+! { dg-do compile }
+! PR 45338 - no ICE when cmp is not used explicitly.
+! Test case by Simon Smart 
+module test_mod
+  implicit none
+contains
+  subroutine test_fn (cmp)
+    interface operator(.myop.)
+       pure function cmp (a, b) result(ret)
+         integer, intent(in) :: a, b
+         logical ret
+       end function cmp
+    end interface
+    integer :: a, b
+    print*, a .myop. b
+  end subroutine test_fn
+end module test_mod