Anonymous structure

[Tofu Ninja via Digitalmars-d-learn]

On Monday, 18 April 2016 at 03:33:53 UTC, Adam D. Ruppe wrote:
> The struct inside union is the main pure-language use case I 
> know of though.

Actually curiously I found another potential use, applying 
attributes/UDAs to multiple members at once.

enum testUDA;
struct T{
	@testUDA
	immutable struct{
		int x;
		int y;
		int z;
	}
}

x,y,and z seem to all be immutable and all have the UDA testUDA. 
But even odder, it seems that "struct" in there is doing 
absolutely nothing. The same thing can be done with

enum testUDA;
struct T{
	@testUDA
	immutable{
		int x;
		int y;
		int z;
	}
}

So it still seems to be useless other than in the case of 
unions...