Why does 6-11-2016 Dev Build for VS15 require VS2015?

[alanpurple]

Why need VS2015?
Which was not true for 1.2 alpha2

[alanpurple]

and yet, even after I installed VS2015 community with updates, still same message blocked me from installing

[mjbvz]

Does the message mention something about upgrading to update 2 of VS 2015? We changed the gating recently but this could have broken VS15: #1009

[mousetraps]

Changes merged. This should be fixed in the next dev build.