>>ww520+9e
I want to clarify: The Rust project has been largely "outside" of the Mozilla incubator for quite a while already; with most of the governance being non-Mozilla individuals. The main things Mozilla provided was infrastructure (a lot of which has moved out in the past year), trademark ownership, and paying some people to work on Rust full-time (which many companies do now).
Make no mistake, Mozilla has contributed a lot to the Rust project, but the particular stage of maturity you mention was achieved some years ago :)