[antlr-interest] Building trees with the correct associativity

[Paul J. Lucas]

	I'm surprised it took me this long to notice I had a problem
	with this, but...

	If I have:

		addExpr
		    : e1:mulExpr
		      (ao:addOp! e2:mulExpr!
		      	{
			    ## = #([ADD_EXPR,"ADD_EXPR"], ao, e1, e2);
			}
		      )*
		    ;

	then my trees get built the wrong way, e.g.:

		5 - 2 + 3

	is as if it were:

		5 - (2 + 3)

	which is wrong.  Maybe I'm being a but slow, but it's not
	immediately clear how to build the tree the other way, i.e.:

		(5 - 2) + 3

	Help.

	- Paul



 
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