The domain differs for Rust from JS or PNaCl. The latter are on the web. Rust is AOT compiled and for systems programming. It's competing with C++, not JS -- and not for safe C++ on the Web (not yet, anyway; Rust2JS and Rust on the GPU are of course on radars due to LLVM and eholk & co. at IU, respectively).
Even with Rust, we don't tear down Unix or DWARF, to pick two examples -- we use 'em for maximum leverage.
Even with Rust, we don't tear down Unix or DWARF, to pick two examples -- we use 'em for maximum leverage.