Hey there.
There’s a bug in the interaction between the currently-deployed rustup and the latest nightlies that you may run into. It doesn’t look like I’ll have a fix out tonight, so I’m giving you a heads up.
The symptoms are that rustup show and rustup target list will panic when they try to print information about the nightly toolchain. As far as I know things will otherwise continue to work.
What’s happened is that we’ve updated the distribution manifest format to include packages of the Rust source code, and the current version of rustup handles this incorrectly in some cases. Since the breakage only seems to affect commands that report toolchain status and not the installation/operation of the toolchain, I intend to press forward, fix the bug in rustup and urge everyone to upgrade.
@Diggsey has already landed a fix (thanks so much!), but since it’s late today I’m not sure if I’ll get it deployed tonight. It could be as late as Monday that I get a fix out.
I apologize for the disruption.