Much more flow control destructuring in RBE

rustbyexample/flow_control.d/match.d/guard2.rs

@@ -0,0 +1,9 @@
+fn main() {
+    let number: u8 = 4;
+
+    match number {
+        i if i == 0 => println!("Zero"),
+        i if i > 0 => println!("Greater than zero"),
+        _ => unreachable!("Should never happen."),
+    }
+}