On 07/21/2015 06:35 PM, Robert Collins wrote:
Cool. http://bugs.python.org/issue21750 is in a bad state right now.

I landed a patch to fix it, which when exposed to users had some
defects. I'm working on a better patch now, but need to either roll
the prior patch completely back, or get the new one landed before the
next beta. I hope to have that up for review later today {fingers
crossed} - will that be soon enough, or should I look up how to easily
revert stuff out with hg?

If you want to undo it, "hg backout" is the command you want.  In general it's best to not check in broken stuff.