[Issue 17635] [REG 2.066.0] cannot convert unique immutable(int)** to immutable

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17635

--- Comment #6 from David Nadlinger <code at klickverbot.at> ---
(In reply to David Nadlinger from comment #5)
> After a quick glance, I'm not sure whether this is indeed what is at fault
> here. If it was indeed getIndirection() that was at fault, shouldn't it then
> also be used to decompose aggregate members in traverseIndirections?

Looking at my old changes, that used to indeed be the case, before I removed
the corresponding check in
https://github.com/dlang/dmd/commit/fa6898c3feb1c500085d73df716b9a1ce9e4afa1. 

It seems like my fix was indeed suboptimal/wrong, in that it left the code in
an overly conservative state, and I suppose it might be easier to start from
Kenji's original code again than from what I did.

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