when compiling code like:

class Test1 {
    int m(int slot) {
        return switch (slot) {
            default -> (slot < 256) ? 1 : 2;
        };
    }
}

class Test2 {
    String of(CharSequence sig) {
        return switch (sig.charAt(0)) {
            case '<' -> switch (sig.toString()) {
                case "<null>" -> "";
                default -> throw new IllegalStateException("failure");
            };
            default -> throw new IllegalStateException("failure");
        };
    }
}


javac fails with:

An exception has occurred in the compiler (16-internal). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program, the following diagnostic, and the parameters passed to the Java compiler in your report. Thank you.
java.lang.AssertionError: CRT: tree source positions are undefined
at jdk.compiler/com.sun.tools.javac.util.Assert.error(Assert.java:162)
at jdk.compiler/com.sun.tools.javac.util.Assert.checkNonNull(Assert.java:137)
at jdk.compiler/com.sun.tools.javac.jvm.CRTable.writeCRT(CRTable.java:107)
at jdk.compiler/com.sun.tools.javac.jvm.ClassWriter.writeCode(ClassWriter.java:1051)
at jdk.compiler/com.sun.tools.javac.jvm.ClassWriter.writeMethod(ClassWriter.java:987)
at jdk.compiler/com.sun.tools.javac.jvm.ClassWriter.writeMethods(ClassWriter.java:1478)
at jdk.compiler/com.sun.tools.javac.jvm.ClassWriter.writeClassFile(ClassWriter.java:1583)
at jdk.compiler/com.sun.tools.javac.jvm.ClassWriter.writeClass(ClassWriter.java:1504)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.genCode(JavaCompiler.java:757)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1644)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1612)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:973)
at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:317)
at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:176)
at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:64)
at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:50)