Hi,

I am trying to upgrade existing grammar file (lets say My.g). Originally it was compiled with Antlr 2.6.1.

Prior to upgrade I decided to recompile My.g with the latest version of Antlr 2.7.2A2 in order to take advantage of all improvements.

But I am receiving an error:

			

			CaseNodes returns [CMyNode *pNode]
			

			{  pNode = NULL ; }
			

			:
			

			"null"      { pNode = new CMyNode (CMyNode::Null) ; }
			

			| a:CASE1   { pNode = new CMyNode (CMyNode::case1); }
			

			| a:CASE2   { pNode = new CMyNode (CMyNode::case2); }
			

			| a:CASE3   { pNode = new CMyNode (CMyNode::case3); }
			

			| a:DEFAULT { pNode = new CMyNode (CMyNode::dflt ); }
			

			. . .
			

			{
			

			pNode->t_ = a;
			

			}
			

			;
			

		

I figured that if I modify this rule to be:

			

			CaseNodes returns [CMyNode *pNode]
			

			{  pExpr = NULL ; }
			

			:
			

			"null"     { pNode = new CMyNode (CMyNode::Null) ; }
			

			| a:CASE1  { pNode = new CMyNode (CMyNode::case1); pNode->t_ = a; }
			

			| a1:CASE2 { pNode = new CMyNode (CMyNode::case2); pNode->t_ = a1;}
			

			| a2:CASE3   { pNode = new CMyNode (CMyNode::case3); . . .}
			

			| a3:DEFAULT { pNode = new CMyNode (CMyNode::dflt ); . . .}
			

			. . .
			

			;
			

		

errors are gone , but this will require huge amount of changes in the existing grammar file,
and some of them are very messy.

How come this was not a problem before ? Is there are more ellegant way to solve it ?
Please, help . . .