Passing program arguments through Cargo

Question

I have some sample code that is currently making use of getopts which is specified as a dependency in Cargo.toml

[dependencies]
getopts = "0.2"

However I can not seem to pass argument (-t, --test) through Cargo (e.g. cargo run --test) for obvious reasons.

Since I have specified that external dependency, trying to run rustc src/main.rs --test won't work either:

src/main.rs:2:5: 2:21 error: unresolved import `getopts::Options`. There is no `Options` in `getopts`
src/main.rs:2 use getopts::Options;
              ^~~~~~~~~~~~~~~~
error: aborting due to previous error

Is there another way to achieve this or some common alternative for the time being?

Answer 1

You can pass trailing arguments to cargo run using --:

cargo run -- --test

From the man page:

All of the trailing arguments are passed to the binary to run. If you're passing arguments to both Cargo and the binary, the ones after -- go to the binary, the ones before go to Cargo.