Pass template parameter into q{} string

[Andrey via Digitalmars-d-learn]

Hello,
enum Key : string
{
          First = "qwerty",
          Last = "zaqy"
}
void main()
{
    enum decl(alias values1) = q{
        static foreach(value; values1)
            mixin("bool " ~ value ~ " = false;");
    };

    enum qqq = [Key.First, Key.Last];
    mixin(decl!qqq);
}

I don't understand how to pass template parameter "values1" into 
q{} string to get this output:
static foreach(value; [Key.First, Key.Last])
    mixin("bool " ~ value ~ " = false;");
or
static foreach(value; qqq)
    mixin("bool " ~ value ~ " = false;");