code: def comp_pipe_info(op):
      
      if op == "..>":
          return "forwards", False
      elif op == "<..":
          return "backwards", False
      elif op == "..*>":
          return "forwards", True
      elif op == "<*..":
          return "backwards", True
      else:
          raise CoconutInternalException("invalid function composition pipe operator", op)
docs: Returns (direction, star) where direction is 'forwards' or 'backwards'.