Why can't I assign a mixin to an alias?

[Alex Parrill via Digitalmars-d-learn]

On Friday, 10 June 2016 at 22:38:29 UTC, Dechcaudron wrote:
> I have the following code:
>
> private string getVariableSignalWrappersName(VarType)()
> {
> 	return VarType.stringof ~ "SignalWrappers";
> }
>
> void addVariableListener(VarType)(int variableIndex, void 
> delegate(int, VarType))
> {
> 	alias typeSignalWrappers = 
> mixin(getVariableSignalWrappersName!VarType);
> }
>
> On compilation, the following error is issued:
> Error: basic type expected, not mixin
>
> Why should it be like that? I believe the compiler should not 
> impose restrictions on what mixins can or cannot do :/

Mixins are statements. They cannot be a part of an expression.

The other two posts have demonstrated how to get around this.