immutable & alias this

[bearophile]

I find typedef useful still. While trying to create a poor's man typedef using 
a struct with alis this, I have found this problem:



struct Typedef(T) {
    T data;
    alias data this;
}

alias int[] TA1;
typedef int[] TA2;
alias Typedef!(int[]) TA3;

immutable TA1 a1;
immutable TA2 a2;
TA3 a3a;
immutable TA3 a3b;

static this() {
    a1 = [1, 2, 3];  // OK
    a2 = [1, 2, 3];  // OK
    a3a = [1, 2, 3]; // OK
    a3b = [1, 2, 3]; // line 16, error
}
void main() {}



DMD 2.057beta gives:

test.d(16): Error: cannot implicitly convert expression ([1,2,3]) of type int[] 
to immutable(Typedef!(int[]))

What do you think?

Bye,
bearophile