Katara author here, you're right! Katara is built on Metalift (https://github.com/metalift/metalift), which is a general purpose framework we've been building at Berkeley to abstract away the logic of analyzing the LLVM IR. The decision to use LLVM was exactly because it is the least-common-denominator for so so many languages, so we are excited to add official support for Rust and friends in the near future!