C# 5 comes with .NET 4.5.
The new features of C# 5 seem to be only:
Improve parser (C# 5.0) Support asynchronous methods
Add support for .NET 4.5
As discussed, this ticket is too vague, cannot be implemented nor tested.
I have created SONARDOTNT-329 as a consequence, and this ticket is marked to depend on that one.
This is I believe the only action required to support C# 5.0 from the parser side, so I mark this ticket as resolved (as all the tickets have been created).
For the ITs, we should try to find some C# 5/.NET 4.5 code base that can be analysed in C# parsing ITs.
IT Sources was updated (not sure the C# 5.0 features are used from there though)