[josephg]

Yes! A quick google brings up cargo-llvm-cov[1], which is a rust wrapper around llvm source code coverage. It has an unstable --branch command for branch coverage, but branch coverage currently has some language level limitations[2].

[1] https://github.com/taiki-e/cargo-llvm-cov

[2] https://github.com/rust-lang/rust/issues/124118