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Aug 23, 2015 at 14:45
Rust nightly is now warning about upcoming changes to the type checker. There are some (obscure) soundness holes:
rfcs/text/0000-projections-lifetimes-and-wf.md at projection-and-lifetimes · nikomatsakis/rfcs
rfcs/text/0000-projections-lifetimes-and-wf.md at projection-and-lifetimes · nikomatsakis/rfcs
RFCs for changes to Rust. Contribute to nikomatsakis/rfcs development by creating an account on GitHub.

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Nov 11, 2018 at 11:14
1
It's easy to use lots of different versions of Rust nightly. Remacs requires a specific version. The https://autogen.sh/ scripts are admirably defensive, to help you get on the right version!
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autogen.sh
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Oct 21, 2017 at 13:07
Making my first Rust 1.0 project run on modern Rust. So many libraries needed nightly then, so I can't just compile without changes
Nov 20, 2016 at 11:37
You can use Travis CI as an early warning system. Allow failures, but build against Rust nightly/Emacs trunk/etc and catch issues early.