[ameliaquining]

Rust has procedural macros, which turn out to be a good-enough substitute for real compile-time reflection for surprisingly many use cases, though nowhere near all of them. (In particular, Serde, the universally-adopted framework/library for serializing and deserializing arbitrary data types, is a third-party library powered by procedural macros.)

Real compile-time reflection is in the works; the very earliest stages of a prototype implementation were released to the nightly channel last month (https://github.com/rust-lang/rust/pull/146923), and the project has proposed (and is likely to adopt) the goal of completing that prototype implementation this year (https://rust-lang.github.io/rust-project-goals/2026/reflecti...), though it most likely will not reach the stable channel until later than that, since there are a whole lot of complicated design questions that have to be considered very carefully.

[debugnik]

"Powered by" is an understatement, Serde would be unusable without procedural macros. Deserializers use a ridiculously verbose visitor pattern that's completely unnecessary in a language with move semantics, it should have been a recursive descent API.

Using serde_json to accurately model existing JSON schemas is a pain because of it.

I personally find third-party deriving macros in Rust too clunky to use as soon as you need extra attributes.