Bug with pointer and non-trivial class layout

[lookfwd]

On the following code:

#include <assert.h>

unsigned cnt = 0;

struct Foo {
    //int i;
};

class Box
{
    unsigned * monitor;
    Foo f;

    void op()
    {
        assert(monitor == &cnt);

        *monitor = 1;
    }
};

class Container
{
    Box boxes[1];
};

int main()
{
    Container c;

    c.boxes[0].monitor = &cnt;
    c.boxes[0].op();

    assert(cnt == 0u);

    return 0;
}

depending on if Foo f; exists (try commenting it out), the checker does or doesn't work (despite the fact that Foo is empty.

[TGWDB]

Not reproducible in current version.

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