Much renaming and refreshing of RBE

rustbyexample/variable_bindings.d/declare.rs

@@ -0,0 +1,19 @@
+fn main() {
+    let a_binding;
+
+    {
+        let x = 2;
+
+        a_binding = x * x;
+    }
+
+    println!("a binding: {}", a_binding);
+
+    let another_binding;
+
+    //println!("another binding: {}", another_binding);
+
+    another_binding = 1;
+
+    println!("another binding: {}", another_binding);
+}

rustbyexample/variable_bindings.d/freeze.rs

@@ -0,0 +1,11 @@
+fn main() {
+    let mut _mutable_integer = 7i32;
+
+    {
+        let _mutable_integer = _mutable_integer;
+
+        // _mutable_integer = 50;
+    }
+
+    _mutable_integer = 3;
+}

rustbyexample/variable_bindings.d/mut.rs

@@ -0,0 +1,12 @@
+fn main() {
+    let _immutable_binding = 1;
+    let mut mutable_binding = 1;
+
+    println!("Before mutation: {}", mutable_binding);
+
+    mutable_binding += 1;
+
+    println!("After mutation: {}", mutable_binding);
+
+    // _immutable_binding += 1;
+}

rustbyexample/variable_bindings.d/scope.rs

@@ -0,0 +1,12 @@
+fn main() {
+    let long_lived_binding = 1;
+
+    {
+        let short_lived_binding = 2;
+        println!("inner short: {}", short_lived_binding);
+    }
+
+    // println!("outer short: {}", short_lived_binding);
+
+    println!("outer long: {}", long_lived_binding);
+}

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);
+}