Implementing a modern, production-quality compiler is not easy as a baseline, but nothing in the design of OCaml, Haskell, or Rust adds any significant obstacles, relative to Common Lisp, to supporting this feature. Slinging an AST around and dropping it into a quasiquoted template is a well-understood problem. The simplicity of Lisp's syntax is not a prerequisite and hasn't been since the parsing techniques that were developed in the 1970s.
Done properly? I can't speak to camlp4, but at least in the case of Haskell and Rust, certainly. Incidentally I just had my first occasion to write a Rust procedural macro last weekend. I had a significantly complex transformation written and working in half a day, learning curve included, and I found it all pretty frictionless.
Done properly? I can't speak to camlp4, but at least in the case of Haskell and Rust, certainly. Incidentally I just had my first occasion to write a Rust procedural macro last weekend. I had a significantly complex transformation written and working in half a day, learning curve included, and I found it all pretty frictionless.