Works in D1 (1.073) but not in D2 (2.058):

struct A
{
    enum
    {
        E
    }
}

alias A A2;
alias A2.E E2; // Fine

struct B
{
    alias A.E E1; // Fine
    alias A A2;
    alias A2.E E2; // Error: alias test.B.E2 cannot alias an expression 0
}