making it easier to use unions

[Henry Spencer]

> C++ permits "anonymous unions" ...

Actually, the really old C compilers permitted this too, by accident,
since they had no notion that a struct/union member name "belonged" to
a particular struct/union.  To them, a member name was just an offset
and a type.  Since all offsets in a union are 0, it all worked out.
A certain amount of old code, notably the Unix kernel, relied on this.
This trick broke when member names became local.
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