why mixin template can not inclulde statement;

[learnfirst1]

On Friday, 10 August 2018 at 13:05:24 UTC, Kagamin wrote:
> Mixim template can only introduce declarations, not statements, 
> a workaround is a lambda called in place.
>
> mixin template test(A...){
>         __gshared a = A;
>         int dummy = (){ a++; return 0; }();
> }
>
> extern(C) void main(){
>         mixin test!123;
> }

Thanks, this work for me.   my second example should be a dmd bug 
? (ldc work)