I don't have such an error here. Are you sure it is my patch that causes this ? Line 591 does not say much. Is it in the .cmd file or the .cmd.exp one. What is the failing command ? I don't see the point with testbot, there is no tests change in my patch.
Don't have the error anymore, probably a temporary local glitch. For the testbot, that was effectively an error of me, since win obviously doesn't run cmd parsing code. When Dan's buildbot is stable enough, we could however test changes there.
Sorry for the noise.
Frédéric