> 
> Not true, in principle.  E.g.
> 
>   #define foo -1
>   ...
>   char f(char* a) { return foo[a]; }  // -a[1] or a[-1]?
> 
> Such an expression should, of course, be taken out and shot (although
> it's far less bad than "(x = x++ % y)" that appeared in a macro until
> very recently).  
> 
OK, you win :)
	-=hpa
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