Why does ComplexListPlot labeling function require an Evaluate?

Start with the list of the cube-roots of unity:

cubeRoots = ComplexExpand[Exp[(2 [Pi] Range[0, 2] I)/3]]

I want to use ComplexListPlot to plot these three points and label each of them with its value.

Noting the the first example in the documentation for the "LabelingFunction" option to ComplexListPlot, namely…

ComplexListPlot[{1, E^((2 I [Pi])/7), E^((4 I [Pi])/7), E^((
   6 I [Pi])/7), E^((8 I [Pi])/7), E^((10 I [Pi])/7), E^((
   12 I [Pi])/7)} -> {0, 1, 2, 3, 4, 5, 6}]

…I tried the following;

ComplexListPlot[cubeRoots -> cubeRoots,
  PlotStyle -> Directive[Red, PointSize[Large]],
  Ticks -> None, PlotRange -> 1.5,BaseStyle -> {11},
  ImageSize -> Scaled[0.5]]

That fails, with error: "ComplexListPlot called with 0 arguments; 1 argument is expected."

Wrapping the first instance of cubeRoots with Evaluate works, however:

ComplexListPlot[Evaluate[cubeRoots] -> cubeRoots,
 PlotStyle -> Directive[Red, PointSize[Large]],
 Ticks -> None, PlotRange -> 1.5, BaseStyle -> {11},
 ImageSize -> Scaled[0.5]]

Question: Why is the Evaluate needed to wrap around the left-hand side of the Rule that constitutes, in effect, the argument to ComplexListPlot?