[Issue 23979] 2.104 segfaults

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23979

--- Comment #2 from Dennis <dkorpel at live.nl> ---
Reduced to:
```D
class A {}

void h()
{
    const auto classPtr = SPtr.init;
    assert(!__traits(compiles, *classPtr));
}

struct SPtr
{
    A ptr() { return A.init; }
    alias ptr this;
}
```

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