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java.lang.AssertionError: typeSig 19	at com.sun.tools.javac.jvm.ClassWriter.assembleSig(ClassWriter.java:337)	at com.sun.tools.javac.jvm.ClassWriter.typeSig(ClassWriter.java:406)	at com.sun.tools.javac.jvm.ClassWriter.writeField(ClassWriter.java:920)	at com.sun.tools.javac.jvm.ClassWriter.writeFields(ClassWriter.java:1412)	at com.sun.tools.javac.jvm.ClassWriter.writeClassFile(ClassWriter.java:1502)	at com.sun.tools.javac.jvm.ClassWriter.writeClass(ClassWriter.java:1442)	at com.sun.tools.javac.main.JavaCompiler.genCode(JavaCompiler.java:618)	at com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1289)	at com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1259)	at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:765)	at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:730)	at com.sun.tools.javac.main.Main.compile(Main.java:353)	at com.sun.tools.javac.main.Main.compile(Main.java:279)	at com.sun.tools.javac.main.Main.compile(Main.java:270)	at com.sun.tools.javac.Main.compile(Main.java:69)	at com.sun.tools.javac.Main.main(Main.java:54)