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> That should be clarified as "immediately preceded".  The above case would still
> be a syntax error unless rewritten as a(1,("x" "y"),2).

Ah, that would work, but I find it a little bit strange.
I'd rather write this is as
	a(1,("x" .. "y"),2).
and have the lexer do the optimization. It'd remain valid code even it there
was no optimization.