They have :
https://www.rust-lang.org/ides.html
>We propose a new tool, an 'oracle' which takes input from the compiler, maintains a project-wide view of the code and it's type information, and provides data about the project to IDEs and other tools. The oracle is a long-running daemon and presents an API via IPC.
Which is great idea. But it is not implemented yet (AFAIK).
personal opinion : Rust with this pace, will be absolutely one of the best language in term of usage/tools in next 5 year.
Similar to that, I really like how in Intellij I can can use my Maven and Gradle build script as the IDE project's property file. I can now have my source checkout not include any helpful IDE specific files, but still have the project be instantly imported into an IDE.
I would much rather they don't do that and instead offer tools that can answer IDE-like queries (e.g. "Who calls this function?", "Where is this identifier defined?", etc.) and let people integrate that into Emacs, Vim, Atom, and other editors and IDEs. This brings all the communities together and doesn't dictate one particular tool over all others.