Data update

Task/Boolean-values/Rust/boolean-values.rs

@@ -0,0 +1,15 @@
+fn main() {
+    // Rust contains a single boolean type: `bool`, represented by the keywords `true` and `false`.
+    // Expressions inside `if` and `while` statements must result in type `bool`. There is no
+    // automatic conversion to the boolean type.
+
+    let true_value = true;
+    if true_value {
+        println!("foo is {}.", true_value);
+    }
+
+    let false_value = false;
+    if !false_value {
+        println!("bar is {}.", false_value);
+    }
+}