Rust 1.30 is here! Proc macros, no_std binaries, and a progress bar for cargo! 

https://blog.rust-lang.org/2018/10/25/Rust-1.30.0.html …
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awesome! Excited to give that guide a shot.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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(Can I follow this tutorial with "stable" now? Or do I still need to do `rustup default beta`?