[antlr-interest] Why stream name can't be printed out when error occurs(ANTLR C)?

[Mu Qiao]

I set the fileName for ANTLR3_INPUT_STREAM and the file name can be
printed out when error occurs. But when the tree parser is involved,
the name can't be always printed out (print unknown-source instead
sometimes).

I checked the implementation of antlr3baserecognizer.c and I find the
name is decided by tnode->token. However, as we have
tns->istream->streamName, why not use that attribute? This will ensure
the name can be printed out no matter what kind of the current token
it is.

-- 
Best wishes,
Mu Qiao
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