Yeah, in detail, they use or can use: Syntax + tooling for it, like editors, linters, formatters Compiler (rustc, which enforces memory+thread-safety for the parts not implemented in C) They’ve replaced: std library → core library + their own implementation of types that do memory allocations, so in particular dynamically-sized types like lists and strings Cargo → their own Meson definitions What they don’t use: the library ecosystem of Rust (although apparently they’ve got own implementations of “logging, command-line argument handling, event processing, and error management”) It does sound like someone thought about this stuff, but yeah, as a Rust dev, it also sounds like I would struggle…