A project I'd love to see (either separate, or eventually baked into the test harness), is test coverage data. Something like how Go's cover[1] works, by adding counters to the source code, seems simplest. I've thought about this, and it could either be a CLI tool, like `rustc --cover --test`, or a plugin. Perhaps including a `#![cover]` attribute in the crate or something. With a plugin, the Plugin Registrar would need to add the ability to register a Visitor that can modify the AST.
[1] http://blog.golang.org/cover
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