Whatever, if I rtfm, especially the part saying "Operators Are Functions" 
(with the only exceptions of && and ||, because of short-circuit 
evaluation), then I conclude that the error message following &(x,y) is not 
a feature, it's a bug. And whether we like a generated parser or not, it's 
better than a buggy one, imho. Sure grammar can be ambiguous, but there are 
techniques to get around that, like here: 
http://accent.compilertools.net/Accent.html

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