Errors shown on valid code with weird using() statement

I have a conditional using statement in my code. It's a little weird but it works and ReSharper 2.x and 3.x understood it fine. Basic construct is:

using (variable ? DisposableGetter : null) { ... }

and in R#2/3 this worked fine and I got intellisense as expected everywhere within that statement. With R# 4 it gives me three errors and no intellisense.

on "variable": Type name expected, but parameter name found

on "DisposableGetter": You must provide an initializer in a 'using' statement declaration

closing paren: Unexpected token


Full example attached. This is pretty close to my real code.

Thanks,

Sam