test/langtools/tools/javac/T8286797.java

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/*
 * @test
 * @bug 8286797
 * @summary  Guards of constant value false are not permitted
 * @compile/fail/ref=T8286797.out -XDrawDiagnostics -XDshould-stop.at=FLOW T8286797.java
 */

public class T8286797 {

    public void testWithConstant(Object o) {
        switch (o) {
            case String s when false -> {}
            default -> {}
        }
    }

    public void testWithSimpleName(Object o) {
        final int x = 0;
        switch (o) {
            case String s when x == 42 -> {}
            default -> {}
        }
    }
}