Much renaming and refreshing of RBE

rustbyexample/variable_bindings.rs

@@ -0,0 +1,15 @@
+fn main() {
+    let an_integer = 1u32;
+    let a_boolean = true;
+    let unit = ();
+
+    let copied_integer = an_integer;
+
+    println!("An integer: {:?}", copied_integer);
+    println!("A boolean: {:?}", a_boolean);
+    println!("Meet the unit value: {:?}", unit);
+
+    let _unused_variable = 3u32;
+
+    let _noisy_unused_variable = 2u32;
+}