const struct not accepted as initializer by dmd 2.00x

[torhu]

This code compiles fine with dmd 1.017, but not with dmd 2.002.

---
struct Inner
{
    int value;
}

struct Outer {
    //const(Inner) i;  // this fixes it, but is not valid in D 1.0
    Inner i;
}

const Inner ic = { 5 };  // const or invariant here makes no difference

Outer outer = {
    i: ic      // line 14
    //i: { 5 }  // this is allowed
};
---
c:\prog\test\D>dmd -c test
test.d(14): Error: non-constant expression cast(Inner)ic
---

I'm wondering why 'const Inner ic = { 5 };' isn't considered const 
enough to be accepted as an initializer for outer.ic.  I'm trying to 
make this code work in D version 1 too, and since it's for an example, 
I'd like avoid any string mixins or other ugly workarounds.