test/langtools/tools/javac/patterns/T8343932.java

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/**
 * @test
 * @bug 8343932
 * @summary Error when parsing qualified generic type test pattern in switch
 * @compile T8343932.java
 */
public class T8343932 {
    abstract sealed class J<T1, T2> permits X.S, A {}
    final class A extends J<Integer, Integer> {}

    public class X<T> {
        final class S<U> extends J<T, U> {
            abstract sealed class J<T1, T2> permits XX.SS, AA {}
            final class AA extends J<Integer, Integer> {}

            public class XX<T> {
                final class SS<U> extends J<T, U> {}
            }
        }

        static int test(J<Integer, Integer> ji) {
            return switch (ji) {
                case A a -> 42;
                case X<Integer>.S<Integer> e -> 4200; // level 1
            };
        }

        static int test(X<Integer>.S<Integer>.J<Integer, Integer> ji) {
            return switch (ji) {
                case X<Integer>.S<Integer>.AA a -> 42;
                case X<Integer>.S<Integer>.XX<Integer>.SS<Integer> e -> 4200; // level 2
            };
        }
    }
}