Is deprecating a template supposed to work?

[MoonlightSentinel]

On Thursday, 20 February 2020 at 22:31:16 UTC, aliak wrote:
> Is this suppose to give a deprecation error message?
>
> deprecated("a")
> alias A(T) = B!T;
>
> template B(T) {
>     alias B = T;
> }
>
> void main() {
>     A!int a; // should this cause a message "a" ?
> }
>
> ??
>
> Or am I using it wrong maybe?

It's a bug, see https://issues.dlang.org/show_bug.cgi?id=20190