dev-util/cargo-0.21.0 does not build because one of required crates seems to be removed from crates.io: >>> Downloading 'https://crates.io/api/v1/crates/error-chain-0.11.0/rc.2/download' --2017-11-02 10:19:55-- https://crates.io/api/v1/crates/error-chain-0.11.0/rc.2/download Resolving crates.io... 54.243.202.193, 54.243.171.148, 54.243.175.62, ... Connecting to crates.io|54.243.202.193|:443... connected. HTTP request sent, awaiting response... 404 Not Found 2017-11-02 10:19:55 ERROR 404: Not Found. Reproducible: Always
Seems to have been fixed: >>> Downloading 'https://crates.io/api/v1/crates/error-chain/0.11.0-rc.2/download'