[Issue 17572] unrestricted union erroneously invokes postblit

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17572

--- Comment #1 from kinke at gmx.net ---
Not a bug, as the copy and postblit happens correctly when constructing the
`cast(POD!Node)val` rvalue, see
https://github.com/ldc-developers/ldc/issues/2185.

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