Much renaming and refreshing of RBE

rustbyexample/variable_bindings.d/scope2.rs

@@ -0,0 +1,15 @@
+fn main() {
+    let shadowed_binding = 1;
+
+    {
+        println!("before being shadowed: {}", shadowed_binding);
+
+        let shadowed_binding = "abc";
+
+        println!("shadowed in inner block: {}", shadowed_binding);
+    }
+    println!("outside inner block: {}", shadowed_binding);
+
+    let shadowed_binding = 2;
+    println!("shadowed in outer block: {}", shadowed_binding);
+}