http://blogs.msdn.com/b/lucian/archive/2012/07/19/when-is-a-non-breaking-language-fix-breaking.aspxIn VS2012 we fixed some method-resolution problems from VS2010. These were method-calls that failed to compile in VS2010, but now compile cleanly in VS2012. VB: Dim numbers As IEnumerable ( Of Integer ) = {1, 2, 3} Sub f( Of T )(x As T ) Suben-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)