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By default, cargo provides alias for some commonly used functions. This patch
makes it that those alias will complete the same as their full commands.

Default alias:
b -> build
c -> check
t -> test
r -> run

Since cargo allows users to define custom alias it would be nice if
oh-my-zsh automatically detected those and preformed completions as such
but that would be a much more complex patch.

https://english.stackexchange.com/a/180617
https://web.archive.org/web/20190728053012id_/grammarist.com/usage/up-to-date/#text-60

https://github.com/rust-lang/cargo/blob/cdac4a8/src/etc/_cargo

* Update for latest rustc

* Some debug option updates

* Add some cargo flags

* Fix bug in cargo plugin

Copy of the official repository:
https://github.com/rust-lang/cargo/tree/master/src/etc

Signed-off-by: Marc Cornellà <marc.cornella@live.com>

the Rust build system