Code coverage is collected by collect_coverage.rs. This binary invokes llvm_profdata and llvm_cov, which both dynamically link to libLLVM (e.g. libLLVM-17-rust-1.77.0-stable.so). While this library is part of the Rust distributed archive, it is not included in the toolchain, or leading to the collect_coverage binary only functioning if Rust is installed locally.