1 /*

     2  * @test /nodynamiccopyright/

     3  * @bug 8187429 8231827

     4  * @summary Missing unchecked conversion warning

     5  * @compile/fail/ref=UncheckedWarningOnMatchesTest.out -Xlint:unchecked -Werror -XDrawDiagnostics --enable-preview -source ${jdk.version} UncheckedWarningOnMatchesTest.java

     6  */

     7 import java.util.ArrayList;

     8 

     9 public class UncheckedWarningOnMatchesTest {

    10 

    11     public static void main(String [] args) {

    12 

    13         Object o = new ArrayList<UncheckedWarningOnMatchesTest>();

    14         if (o instanceof ArrayList<Integer> ai) {  // unchecked conversion

    15             System.out.println("Blah");

    16         }

    17     }

    18 }