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The new variance system causes compilation errors when you have empty traits such as
This follows the new system, but meant copying a couple more traits over from libcore. It might be worth it to consider just building libcore and linking against it or this kind of thing is going to keep coming up.
The
#![no_std]
attribute was also put behind a feature gate, so I changed that as well.Note that the
MarkerTrait
andPhantomFn
snipets are taken straight out of libcore.