Delay in index updates due to GitHub outage
Incident Report for The Rust Programming Language
Resolved
Crates published to crates.io may experience a delay in appearing in the crates.io index, due to an ongoing issue with GitHub. This means that your crate may appear on crates.io, but cannot yet be used in Cargo.toml. If your crate is affected, it will automatically be published to the index as soon as we are able to. No further action is required from you.

You can follow https://www.githubstatus.com/incidents/8x69vj1xyp9v for updates on the underlying incident.
Posted 3 months ago. Jul 22, 2019 - 16:29 UTC
This incident affected: crates.io.