test/langtools/tools/javac/patterns/AnnotationErrors.java

/*
 * @test /nodynamiccopyright/
 * @bug 8300543
 * @summary Verify error related to annotations and patterns
 * @compile/fail/ref=AnnotationErrors.out -XDrawDiagnostics -XDshould-stop.at=FLOW AnnotationErrors.java
 */

import java.lang.annotation.ElementType;
import java.lang.annotation.Target;

public class AnnotationErrors {

    private void test(Object o, G<String> g) {
        boolean b1 = o instanceof @DA R(var s);
        boolean b2 = o instanceof @DTA R(var s);
        boolean b3 = o instanceof @TA R(var s);
        boolean b5 = g instanceof G<@DTA String>(var s);
        boolean b6 = g instanceof G<@TA String>(var s);
        switch (o) {
            case @DA R(var s) when b1 -> {}
            case @DTA R(var s) when b1 -> {}
            case @TA R(var s) when b1 -> {}
            default -> {}
        }
        switch (g) {
            case G<@DTA String>(var s) when b1 -> {}
            case G<@TA String>(var s) when b1 -> {}
            default -> {}
        }
    }

    record R(String s) {}
    record G<T>(T t) {}

    @Target(ElementType.LOCAL_VARIABLE)
    @interface DA {}
    @Target({ElementType.TYPE_USE, ElementType.LOCAL_VARIABLE})
    @interface DTA {}
    @Target(ElementType.TYPE_USE)
    @interface TA {}
}