latest rust fails to install

[Koichiro IWAO]

> I would also need their approval to revert anything. We are all doing
> this on our spare time and bapt@ and antoine@ are very busy with many
> tasks. Let's give them some more time :)

That's too bad. Reverting to unbroken state should be done quickly.
We get stuck, cannot go forward or backward for now.  Anyway, I
understand the only thing we can do is to keep waiting, thanks.

I have another question. Did the breakage commit pass review?
I can't believe such easy mistakes were overlooked.

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