For Rust the infinite loop is important enough to have its own keyword.

The reason for this is interesting. Loop constructs that you're guaranteed to enter have implications for control flow (in every language, not just Rust). It means that the following program is valid in Rust:

    let x; // declared, but uninitialized variable
    loop { // control flow is guaranteed to enter this loop
        if some_condition() {
            x = 42; // initialize x
            break;
        }
    }
    foo(x); // Rust knows that x is initialized as of here in all possible paths

Interestingly, this all suggest that, in C-like languages, the more natural implementation of an infinite loop should not be `while(true)` nor `for(;;)`, but rather `do {} while(true)`, because do-while are also guaranteed to enter their body (and note that Rust doesn't feature do-while loops).