Ambiguity issue with expanding and evaluating single template type parameter enums

[data pulverizer]

On Monday, 27 December 2021 at 21:05:51 UTC, data pulverizer 
wrote:
> Hello, ...
> 

... an equivalent mixin error would be

```
//...

alias DOUBLE = MyEnum.DOUBLE;
alias STRING = MyEnum.STRING;
alias INTEGER = MyEnum.INTEGER;

void main()
{
   alias T = MyType!(INTEGER);
   alias U = MyType!(STRING);
   enum code = "writeln(\"instance: \", adder(" ~
               T.stringof ~ "(), " ~ U.stringof ~ "()" ~ "));";
   mixin(code);
}

```