Single Tag interop

• Mix in Rust with Java (or Kotlin!)
• Rust interop in practice: speaking Python and Javascript
• Mix in Rust with C++
• Mix in Rust with Python: PyO3
• Mix in C with Rust: A taste of C in your Rust
• Mix in Rust with C: Delegating FFI definitions to Diplomat
• Mix in Rust with C
• Mix in Rust