Merge branch 'master' into new

ex6.rs

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+// ex6.rs
+// Make me compile! Scroll down for hints :)
+
+fn main() {
+    let robot_name = Some(String::from("Bors"));
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+    match robot_name {
+        Some(name) => println!("Found a name: {}", name),
+        None => (),
+    }
+
+    println!("robot_name is: {:?}", robot_name);
+}
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+// Hint: The following two statements are equivalent:
+// let x = &y;
+// let ref x = y;