Add more examples @ drop.md

src/trait/drop.md

@@ -54,4 +54,56 @@ fn main() {
 }
 ```
 
+For a more practical example, here's how the `Drop` trait can be used to automatically
+clean up temporary files when they're no longer needed:
+
+```rust,editable
+use std::fs::File;
+use std::path::PathBuf;
+
+struct TempFile {
+    file: File,
+    path: PathBuf,
+}
+
+impl TempFile {
+    fn new(path: PathBuf) -> std::io::Result<Self> {
+        // Note: File::create() will overwrite existing files
+        let file = File::create(&path)?;
+
+        Ok(Self { file, path })
+    }
+}
+
+// When TempFile is dropped:
+// 1. First, the File will be automatically closed (Drop for File)
+// 2. Then our drop implementation will remove the file
+impl Drop for TempFile {
+    fn drop(&mut self) {
+        // Note: File is already closed at this point
+        if let Err(e) = std::fs::remove_file(&self.path) {
+            eprintln!("Failed to remove temporary file: {}", e);
+        }
+        println!("> Dropped temporary file: {:?}", self.path);
+    }
+}
+
+fn main() -> std::io::Result<()> {
+    // Create a new scope to demonstrate drop behavior
+    {
+        let temp = TempFile::new("test.txt".into())?;
+        println!("Temporary file created");
+        // File will be automatically cleaned up when temp goes out of scope
+    }
+    println!("End of scope - file should be cleaned up");
+
+    // We can also manually drop if needed
+    let temp2 = TempFile::new("another_test.txt".into())?;
+    drop(temp2); // Explicitly drop the file
+    println!("Manually dropped file");
+
+    Ok(())
+}
+```
+
 [Drop]: https://doc.rust-lang.org/std/ops/trait.Drop.html