Cannot alias expression

[Dicebot]

On Monday, 21 October 2013 at 12:58:55 UTC, John Colvin wrote:
> I suspect I'm being very dumb here, but I can't get my head 
> around this:
>
>     template B(alias A)
>     {
> 	alias B = A;
>     }
>     template C(A ...)
>     {
> 	alias C = A[0];
>     }
>     static assert(B!1 == 1); //fine
>     static assert(C!1 == 1); //Error: cannot alias an 
> expression 1

I think this is a good match for a gold collection of "awkward 
mismatch of template alias vs normal alias". I am quite surprised 
former template work actually, aliases are not supposed to handle 
expressions at all. But magic of template alias parameter turns 
expression into symbol and here we go.