Edit C:\Program Files\Java\jdk1.8.0_121\lib\sun\tools\tree\Vset.class
?? 4 k 2 3 ()I ()V ()Z (I)V (I)Z (JJ[J)V ...DEAD_END <clinit> <init> Code ConstantValue DEAD_END I J LineNumberTable SourceFile StackMapTable VBITS [J addDAandJoinDU addVar addVarUnassigned append clearDeadEnd clearVar copy emptyX firstDAandSecondDU fullX growX isDeadEnd isReallyDeadEnd java/lang/Object java/lang/StringBuffer join length removeAdditionalVars sun/tools/java/Constants sun/tools/tree/Vset testVar testVarUnassigned toString uset varLimit vset x { {DEAD_END} @???????? $ % ) * Lsun/tools/tree/Vset; ()Ljava/lang/String; (Ljava/lang/String;)V (C)Ljava/lang/StringBuffer; (I)Ljava/lang/StringBuffer; ()Lsun/tools/tree/Vset; (I)Lsun/tools/tree/Vset; ,(Ljava/lang/String;)Ljava/lang/StringBuffer; ,(Lsun/tools/tree/Vset;)Lsun/tools/tree/Vset; A(Lsun/tools/tree/Vset;Lsun/tools/tree/Vset;)Lsun/tools/tree/Vset; . 0 1 < ' ! + , - = > ? @ A C ; F ; G ; H ; I ; J ; K 8 M 9 L 9 R 9 S 9 T 9 U 9 W ; N ; O ; P ; Q ; V Vset.java 1 ; 8 : 0 . 1 4 <