Fixes the "One or more errors occurred" error of VS2015 when you try to use the "Go to definition (F12)" command on system type in C#. This extension is obsolete. Please install the VS 2015 Update 1 to fix this problem. Fixes the "One or more errors occurred" error of VS2015 when you try to use the "Go to definition (F12)" command on system type in C#. An error occurs if you set "Keep tabs" instea