[sv-bc] Can enum base type be struct or multidim array?

It appears that an enum type can be declared with a base type which is a packed struct or multidimensional array. That is, I don't see any rule prohibiting the following:

     typedef struct packed {logic f1, f2, f3;} t1;
     enum t1 {red, blue, green} color1;

     typedef logic [1:0][1:0] t2;
     enum t2 {orange, yellow, violet} color2;

If this is legal, then is it legal to access an enum value as if it were of the base type? Can
you do:

     logic x = color1.f1;
     logic y = color2[1][0];

Paul

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