first commit

exercises/16_lifetimes/lifetimes3.rs

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+// Lifetimes are also needed when structs hold references.
+
+// TODO: Fix the compiler errors about the struct.
+struct Book {
+    author: &str,
+    title: &str,
+}
+
+fn main() {
+    let book = Book {
+        author: "George Orwell",
+        title: "1984",
+    };
+
+    println!("{} by {}", book.title, book.author);
+}