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diff --git a/gcc/testsuite/gfortran.dg/interface_33.f90 b/gcc/testsuite/gfortran.dg/interface_33.f90
new file mode 100644
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+++ b/gcc/testsuite/gfortran.dg/interface_33.f90
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+! { dg-do compile }
+!
+! PR fortran/33117, PR fortran/46478
+! Procedures of a generic interface must be either
+! all SUBROUTINEs or all FUNCTIONs.
+!
+
+!
+! PR fortran/33117
+!
+module m1
+  interface gen
+    subroutine sub()            ! { dg-error "all SUBROUTINEs or all FUNCTIONs" }
+    end subroutine sub
+    function bar()
+      real :: bar
+    end function bar
+  end interface gen
+end module
+
+!
+! PR fortran/46478
+!
+MODULE m2
+  INTERFACE new_name
+    MODULE PROCEDURE func_name
+    MODULE PROCEDURE subr_name
+  END INTERFACE
+CONTAINS
+   LOGICAL FUNCTION func_name()  ! { dg-error "all SUBROUTINEs or all FUNCTIONs" }
+   END FUNCTION
+   SUBROUTINE subr_name()
+   END SUBROUTINE
+END MODULE
+
+! { dg-final { cleanup-modules "m1 m2" } }