File: UncheckedWarningOnMatchesTest.java

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/*
 * @test /nodynamiccopyright/
 * @bug 8187429 8231827
 * @summary Missing unchecked conversion warning
 * @compile/fail/ref=UncheckedWarningOnMatchesTest.out -Xlint:unchecked -Werror -XDrawDiagnostics UncheckedWarningOnMatchesTest.java
 */
import java.util.ArrayList;

public class UncheckedWarningOnMatchesTest {

    public static void meth() {

        Object o = new ArrayList<UncheckedWarningOnMatchesTest>();
        if (o instanceof ArrayList<Integer> ai) {  // unchecked conversion
            System.out.println("Blah");
        }
    }
}