Useless error when ca-certificates are missing

[glandium]

I was trying to cargo build something in a newly created chroot and got the following output:

    Updating registry `https://github.com/rust-lang/crates.io-index`
warning: spurious network error (2 tries remaining): curl error: 
; class=Net (12)
warning: spurious network error (1 tries remaining): curl error: 
; class=Net (12)
error: failed to fetch `https://github.com/rust-lang/crates.io-index`           

Caused by:
  curl error: 
; class=Net (12)

Even with colors, this is not a great error message.
Strace hinted me that /etc/ssl/certs/ca-certificates.crt was missing, and sure enough, it worked after installing the ca-certificates package. But that wasn't thanks to cargo's error message.

[kennytm]

This is a cargo issue and should be filed at https://github.com/rust-lang/cargo/issues.

[glandium]

Gah, sorry. I should have known better. Refiled as rust-lang/cargo#5065