I've recently downloaded the source codes for Sitecore Powershell Extensions from GitHub and I've updated the Sitecore references to use the Sitecore 9 Nuget references. After doing so, I've found that there are build errors because of code that no longer seems to be available in Sitecore 9.
Specifically, in the Cognifide.Powershell project,
PsSitecoreItemProvider.cs, line 566, it is referring to
ProxyManager, however it looks like
Sitecore.Data.Proxies no longer has
ProxyManager in Sitecore 9.
Am I doing something wrong, or is this an issue?