error: use of `extend` instead of `append` for adding the full range of a second vector --> $DIR/extend_with_drain.rs:9:5 | LL | vec2.extend(vec1.drain(..)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `vec2.append(&mut vec1)` | = note: `-D clippy::extend-with-drain` implied by `-D warnings` error: use of `extend` instead of `append` for adding the full range of a second vector --> $DIR/extend_with_drain.rs:14:5 | LL | vec4.extend(vec3.drain(..)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `vec4.append(&mut vec3)` error: use of `extend` instead of `append` for adding the full range of a second vector --> $DIR/extend_with_drain.rs:18:5 | LL | vec11.extend(return_vector().drain(..)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `vec11.append(&mut return_vector())` error: aborting due to 3 previous errors