[antlr-interest] Is this a bug of ANTLR3.1?

[Ronghui Yu]

I have figured out why this happen. In our product, the parser object (ctx)
can be reuseable for parsing different statements, but before parsing each
statement, there is a functio called *reinitLexerAndParser* to prepare
whatever need, one of functions called to re-initialize the parser object is
*setTokenStream*.

Before ANTLR3.1, this function doesn't reset the pointer
ctx->pParser->rec->state->tokenNames, so everything went well for my parser,
but in ANTLR3.1, this function set this pointer to NULL, so when parsing
another statement with this parser object again, the parser encounters a
NULL pointer when calling *getMissingSymbol*
I wonder if this is a must to reset this pointer to NULL.

My current solution is to save this pointer before calling this function,
and restore it after.
It works fine, but I still hope there is an offical approval.

Thanks

-- 
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Regards
Ronghui Yu
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