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add ASTView like v2 had (ANTLR 3)
Define a Swing component to show trees

add dynamic token buffer (ANTLR 3)
Add a token buffer that does not consume all of the input upfront so that we may handle arbitrarily long strings

x!? doesn't work (ANTLR 3)
foo1 : bar1 ';'!? ; // error foo2 : bar2 ';'?! ; // error foo3 : bar3 (';'!)? ; // works! foo4 : bar4 (';'?)! ; // did not try this one

support attribute setting in actions (ANTLR 3)
Just like ST %x.y = z; notation, allow $x = y; notation for attributes. Talk to Kay to figure out full list

add lexer modes (ANTLR 3)
allow users to push/pop the modes also with builtin stack

support output=AST in tree grammars (ANTLR 3)
Need to be able to do tree rewrites. Turn off set token boundaries and add create(AST node) which is dup. Return incoming tree if none set. during AST>AST, what does e : expr > expr expr ...

inheritance or some other grammar sharing mechanism (ANTLR 3)
We will need some form of sharing common grammar chunks

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