详见：
【已解决】antlr出错no viable alternative at input ‘__LBL__show’
【已解决】antlr解析字符串STRING出错：no viable alternative at input，对应的错误是NoViableAltException(0@[null])
【已解决】antlr调试语法代码时出错：mismatched character ’5′ expecting ‘I’，no viable alternative at input ’7′
【已解决】antlr调试解析出错：NoViableAltException(0@[null])
【已解决】Antlr v3代码编译出错：syntax error: antlr: NoViableAltException(37@[])
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| 5.1.4. syntax error: unterminated rule detected at xxx while looking for lexer rule element |  | 5.1.6. Cannot generate the grammar because, duplicate token type xxx when collapsing subrule into set |
