[antlr-interest] error handling v3 style round 2

[Brannon King]

I wasn't around for the previous discussion on this, but I'd like to comment
on it now.

Previously proposed by Terence:

method
	: type ID ...
	;
	exception
		catch[RecognitionException e]
			( {level>0}? ('}' {level--;} | .) )*

That, to me, looks beautiful. It is very close to what I need to do. More
specifically it would be something like this:

method
	: '(' funcName^ i:ID ')'
	{ isValid(i.getText()) }?
	;
	exception
		catch[SemanticException e]
			( {level>0}? (')' {level--;} | .) )*
			{ error("expecting blah, found " + i.getText(), 
				i.file, i.linenum, i.column,
i.getText().length(),
				e.linenum, e.column);
			  recover();
			}

To explain: I need to know the range of characters involved in the found ID
for the editor to mark the error, and I need to recover after I hit that
closing parenthisis. Whatever the case, the recover function needs to be
easy to call; I shouldn't have to spend half a day figuring out what params
it takes.

PS, I like the error alternates as well. The slash looks like a fine
operator to me, though |~ might be more obvious.