Array Iteration

The for statement supports iterating over arrays (but not tuples).

# // Copyright 2023 Google LLC
# // SPDX-License-Identifier: Apache-2.0
#
fn main() {
    let primes = [2, 3, 5, 7, 11, 13, 17, 19];
    for prime in primes {
        for i in 2..prime {
            assert_ne!(prime % i, 0);
        }
    }
}

This functionality uses the IntoIterator trait, but we haven't covered that yet.

The assert_ne! macro is new here. There are also assert_eq! and assert! macros. These are always checked, while debug-only variants like debug_assert! compile to nothing in release builds.