[Issue 20876] DMD gives out not so helpful compile error

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20876

--- Comment #5 from moonlightsentinel at disroot.org ---
(In reply to RazvanN from comment #4)
> The fix in this situation would be to annotate the copy constructor of Bar
> with `inout`: this(ref inout(Bar)) inout . That will make the code to
> compile.

That doesn't work if the struct contains indirections, e.g. when you add a
mutable pointer to Bar...

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