[DougBTX]

To get that degree of flexibility in Rust you’d have to turn to macros, then the return type will depend on the generated code. That could be pretty much anything, so you’d need to read the docs anyway. Perhaps the languages are not that different after all.

D’s syntax for the template body looks much more similar to normal D code, in Rust the pattern macro syntax is like a language to itself and procedural macros need a fair bit of boilerplate, including explicit “quote” blocks.