New Language Features

• C# 7.2 private protected (contributed)
• C# 7.2 conditional ref
• C# 7.1 async Main (contributed)
• C# 7.0 out variables
• C# 7.0 ref returns and locals
• C# 6.0 string interpolation
• C# 6.0 await in catch / finally
• C# 6.0 expression-bodied members
• C# 6.0 null propagator (null-conditional operator, succinct null checking)

Improved Mono mcs Codegen (following areas)

• switch
• lock
• foreach

Test Infrastructure Improvements

• Support for mcs
• Support for vbc

Misc

• UI: Switch to VS MEF (contributed)
• General/UI: Language version selection
• VSIX: drop VS 2015 support