Building off of the techniques in this paper, I will build a code coverage tool for Rust, in Rust.

This won't work until this is properly finished, but I anticipate installation will look something like this:

Note: This is currently only supported on Rust nightly because the plugin API is not on the stable channel

Add the crate to your dev-dependencies section in Cargo.toml:

[dev-dependencies]
rcov = "stable"

Add these lines to the top of your executable's main file:

#![feature(plugin)]
#![plugin(rcov)]

#![coverage]

These lines enable the required feature, load the plugin and apply the coverage syntax extension to the entire crate.

Running cargo test for your project should now instrument your code and result in a code coverage file being produced.

TODO: There should be some way to make coverage optionally compile only in the test executable (using cfg(test)?)

Standard cargo commands apply.

Use this to run the example:

cargo run --example sample

Use this to run the tests and the examples too

cargo test