Mono Upgrade Upgraded Mono/.Net in Editor on 5.5.0b7

Please use the most recent build which has been posted here: https://forum.unity3d.com/threads/upgraded-mono-net-in-editor-on-5-5-0b9.438359/

NOTE: This is an EDITOR ONLY build. The runtime players are not shipped with this release.

Please post any issues you have as a new thread on this forum and tag the posts with Mono Upgrade

Please backup your project before trying this build.

Please see the original preview build post for FAQs: https://forum.unity3d.com/threads/upgraded-mono-net-in-editor-on-5-5-0b4.433541/

Bugs Fixed in this Release:

• Fix GC error "Too many root sets" (835976)
• Fix crash during asset liveness processing (838279, 839717)
• Compile Editor assemblies against .Net 4.6 (837358)
• Fix references to default .Net assemblies (837358)
• Fix UnityScript compilation (836115)

Important Notes

• No playback runtimes are included with this release. This means you can not build any player executables.
• Managed debugging via Visual Studio Tools for Unity or MonoDevelop is *not supported* in this release.
• The compiler targets the C# 6 language.
• The compiler *by default* will still target the .Net 2.0/3.5 framework profile we previously supported. However, you can change this to target .Net 4.6. (See below for instructions)
• The updated Mono garbage collector (SGen GC) *is* enabled in this build, however it is running in a special debug mode drastically impacting it's performance. This release is just for testing for stability not performance.