--- /dev/null
+// rust-lang/rust#54477: runtime bug in the VecDeque library that was
+// exposed by this test case, derived from test suite of crates.io
+// `collection` crate.
+
+use std::collections::VecDeque;
+
+fn main() {
+ let mut vecdeque_13 = VecDeque::from(vec![ ]);
+ let mut vecdeque_29 = VecDeque::from(vec![ 0 ]);
+ vecdeque_29.insert(0, 30 );
+ vecdeque_29.insert(1, 31 );
+ vecdeque_29.insert(2, 32 );
+ vecdeque_29.insert(3, 33 );
+ vecdeque_29.insert(4, 34 );
+ vecdeque_29.insert(5, 35 );
+ // println!("vecdeque_13: {:?}", vecdeque_13);
+ // println!("vecdeque_29: {:?}", vecdeque_29);
+
+ // println!("Invoking: `vecdeque_13.append(&mut vecdeque_29)`");
+ vecdeque_13.append(&mut vecdeque_29);
+
+ // println!("vecdeque_13: {:?}", vecdeque_13);
+
+ assert_eq!(vecdeque_13, VecDeque::from(vec![30, 31, 32, 33, 34, 35, 0]));
+}