invalid type conversion?

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MSW

Little problem with my current space shooter game...this is with the current BlitzPlus V1.37...

I have a "snake" in the game...just a segmented set of sprites that moves around the screen...each segment is a instance of the same type with a Id flag indicateing if it's the snake head or just a body segment...I can get them moveing around and everything, no problem...but I want to draw the sprites in reverse order so that the head is drawn last...

like so:


s.snake = LAST snake

REPEAT

  IF s\idflag = snakebody THEN
    DRAWIMAGE sbodimg, s\x, s\y
  ELSE
    DRAWIMAGE shedimg, s\x, s\y
  END IF

 s = BEFORE s
UNTIL NOT s

That won't even compile and I get the "Invalid type conversion" error indicateing at the keyword REPEAT

However this works fine:


FOR s.snake = EACH snake

  IF s\idflag = snakebody THEN
    DRAWIMAGE sbodimg, s\x, s\y
  ELSE
    DRAWIMAGE shedimg, s\x, s\y
  END IF

NEXT

So it's not the graphic image handles or type fields...what gives?