I have one more suggestion (or the modification of a feature):

  When you write something to, for example, the #warning stream, the given
string is printed there ok.
  However, if you try to print something to the #error stream, nothing is
printed, but the parsing stops and povray shows some lines where the "error"
occurred.
  This is quite useless if you have something like:

#error concat("Expected value between ", str(minval,0,0), " and ",
              str(maxval,0,0), ", but ", str(value,0,0), " was specified.")

  Showing that helps no-one. However, printing that message and stopping
(without showing any source code) would be more useful.

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

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