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 /*

  * @test /nodynamiccopyright/

  * @summary check that default overrides are properly type-checked

  * @compile/fail/ref=Neg09.out -Werror -Xlint:unchecked -XDrawDiagnostics Neg09.java

  */

 import java.util.List;

 class Neg09 {

     interface I {

         default List<String> m() { return null; }

     }

     static class C1 {

         public List m() { return null; } //unchecked (return) override

     }

     static class C2 extends C1 implements I { }

     static class C3 implements I {

         public List m() { return null; } //unchecked (return) override

     }

 }