rustpkg: Trying to install a library twice gives: `no such file or directory`

[kud1ing]

Example:

rustpkg install github.com/linuxfood/rustsqlite
rustpkg install github.com/linuxfood/rustsqlite

gives

task '<unnamed>' failed at 'Unhandled condition: io_error: io::IoError{kind: OtherIoError, desc: "no such file or directory", detail: None}', /Users/lenny/Github/rust/src/libstd/condition.rs:131

[kud1ing]

rustpkg is gone