I was reading <http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/cwg_active.html#222>
and I had a comment.

The discussion and possible resolution focus on expressions of the form
   x = y = e;
but the issue also affects expressions involving using prefix ++ or -- (5.3.2),
e.g.
   x = --y;

Note that -- is not defined in terms of -= even though ++ is defined,
redundantly, in terms of +=.
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