On Tue, Dec 3, 2019 at 6:37 PM Eli Zaretskii <eliz@gnu.org> wrote:

> The return value of setq _is_ documented.

Of course. But certainly, it is "the return value of an operation which is
fundamentally a side-effect", to quote Stefan. So every time he writes code
like that, some poor kitten is sacrificed to Cthulhu.