I think all the following forms should be accepted:

void main() {
    auto i1  = int.init;        // OK
    auto s1  = string.init;     // OK
    auto a1  = int[].init;      // Error
    auto a2  = (int[]).init;    // OK
    auto aa1 = int[int].init;   // Error
    auto aa2 = (int[int]).init; // OK
}


See also Issue 6408