Does anyone has the same thought with me? The complexity of Rust is close to C++ and around equal to Java.And as many people's tought, if you don't advocate to use the GC, are there any reason to use a language which is no-simple and not faster than C++????
Rust was designed to be memory-safe. That means, unless you explicitly mark a section of code as "unsafe", it isn't possible to have segfaults, have buffer overflows, use memory after freeing it, etc. A very significant amount of software bugs - famously, Heartbleed, but also a huge proportion of other security bugs in everything from servers to web browsers - can't happen under Rust code. The point is to have a much more secure programming language, as in resistant to attacks, while still being as fast and as usable as other C-style languages.
The reason Mozilla are developing this is for Servo, a new browser engine which should be far safer than existing ones - although it's also useful for pretty much any other code, as it wipes out entire classes of bugs with not much effort. If you write in a C-like language today, you could pick up most of Rust (lifetimes included) in a couple of days of playing with it.