: You said it: it would open the door to needlessly confusing code.

  Why it would be confusing code?

  If I write: #if(a>0 & b>0)
does it matter whether the part "b>0" is evaluated or not as long as the
result is correct?

  Actually, doing it C-like can produce faster parsing:

  #if(a>0 & extremely_long_calculation(a)) ...

  If a<=0 then the extremely_long_calculation() macro is not called, saving
potentially a lot of time.
  Of course you can do it in the long way:

#if(a>0)
  #if(extremely_long_calculation(a))
    ...
  #end
#end

but why should you do it yourself when the povray parser can do it
automatically for you?

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):_;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

  "The derivative of sin(2x) is cos(2x)"  - Matt Giwer

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