Windows 7 Pro 64-bit - Service Pack 1
Display card: NVidia GTX 1060 6gb
Blender 2.8 beta - blender-2.80.0-git.7d792976e100-windows64
The visual result of the layering of the Freestyle linework onto the rendered image is incorrect in the Eevee render.
A render using Cycles + Freestyle produces correct results (see first image)
A render of the same scene using Eevee + Freestyle shows the Freestyle line surrounded along its length by a whitish halo in the anti-aliased area. (see second image)
This problem occurs with any sort of mesh model. The exact Blender file is not important.