6518 - extra args through a whole swathe of places

Most unbelievably, I'd forgotten to pass the output 'out' arg to 'lookup-var'
long before the recent additions of 'err' and 'ed' args. But things continued
to work because an earlier call just happened to leave the arg at just
the right place on the stack. So we only caught all these places when we
had to provide error messages.

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