cat Y.java
public enum Y { }

$ javac -XDdev -source 1.4 Y.java
Y.java:1: class or interface expected
public enum Y { }
       ^
Y.java:1: reached end of file while parsing
public enum Y { }
                 ^
An exception has occurred in the compiler (1.6.0-rc). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.AssertionError: JCExpressionStatement
        at com.sun.tools.javac.tree.TreeMaker.TopLevel(TreeMaker.java:116)
        at com.sun.tools.javac.parser.Parser.compilationUnit(Parser.java:2027)
        at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:441)
        at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:480)
        at com.sun.tools.javac.main.JavaCompiler.parseFiles(JavaCompiler.java:697)
        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:629)
        at com.sun.tools.javac.main.Main.compile(Main.java:761)
        at com.sun.tools.javac.main.Main.compile(Main.java:686)
        at com.sun.tools.javac.main.Main.compile(Main.java:675)
        at com.sun.tools.javac.Main.compile(Main.java:70)
        at com.sun.tools.javac.Main.main(Main.java:55)