Notice (2018-05-24): bugzilla.xamarin.com is now in
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Take the following code:
> public class Test
> public static void Main()
> new float();
> $ mcs test.cs
> test.cs(5,3): error CS0201: Only assignment, call, increment, decrement, await, and new object expressions can be used as a statement
It compiles fine with MS csc.exe. This was found in one of the dotnet/coreclr test cases, not sure how relevant it is in real code given that it's basically a nop.
Fixed in master