[INFO] fetching crate kik_sync_service 0.7.3...
[INFO] checking kik_sync_service-0.7.3 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] extracting crate kik_sync_service 0.7.3 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate kik_sync_service 0.7.3 on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate kik_sync_service 0.7.3
[INFO] finished tweaking crates.io crate kik_sync_service 0.7.3
[INFO] tweaked toml for crates.io crate kik_sync_service 0.7.3 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2f5571af3ef0f4c7c63a7068a7b359c7947d5939d70fd15fa1e4c7f9112892e4
[INFO] running `Command { std: "docker" "start" "-a" "2f5571af3ef0f4c7c63a7068a7b359c7947d5939d70fd15fa1e4c7f9112892e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2f5571af3ef0f4c7c63a7068a7b359c7947d5939d70fd15fa1e4c7f9112892e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f5571af3ef0f4c7c63a7068a7b359c7947d5939d70fd15fa1e4c7f9112892e4", kill_on_drop: false }`
[INFO] [stdout] 2f5571af3ef0f4c7c63a7068a7b359c7947d5939d70fd15fa1e4c7f9112892e4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dd706d2c3f2cf0fedaed43e90e762dabfb7d8d78fc163784f09147079ac8ebad
[INFO] running `Command { std: "docker" "start" "-a" "dd706d2c3f2cf0fedaed43e90e762dabfb7d8d78fc163784f09147079ac8ebad", kill_on_drop: false }`
[INFO] [stderr]     Checking kik_sync_service v0.7.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_channel.rs:272:21
[INFO] [stdout]     |
[INFO] [stdout] 272 |                     std::mem::drop(&lock);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^-----^
[INFO] [stdout]     |                                    |
[INFO] [stdout]     |                                    argument has type `&MutexGuard<'_, std::sync::mpsc::Receiver<S>>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 272 -                     std::mem::drop(&lock);
[INFO] [stdout] 272 +                     let _ = &lock;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_channel.rs:286:9
[INFO] [stdout]     |
[INFO] [stdout] 286 |         std::mem::drop(&self.rx_inserter);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^-----------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&Arc<Mutex<std::sync::mpsc::Receiver<S>>>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 286 -         std::mem::drop(&self.rx_inserter);
[INFO] [stdout] 286 +         let _ = &self.rx_inserter;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_channel.rs:287:9
[INFO] [stdout]     |
[INFO] [stdout] 287 |         std::mem::drop(&self.feeder);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&FeederRecycler<T, R, S>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 287 -         std::mem::drop(&self.feeder);
[INFO] [stdout] 287 +         let _ = &self.feeder;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_channel.rs:288:9
[INFO] [stdout]     |
[INFO] [stdout] 288 |         std::mem::drop(&self.tx_deliverer);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^------------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&SyncSender<S>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 288 -         std::mem::drop(&self.tx_deliverer);
[INFO] [stdout] 288 +         let _ = &self.tx_deliverer;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_channel.rs:289:9
[INFO] [stdout]     |
[INFO] [stdout] 289 |         std::mem::drop(&self.thread_vec);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^----------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&Vec<JoinHandle<()>>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 289 -         std::mem::drop(&self.thread_vec);
[INFO] [stdout] 289 +         let _ = &self.thread_vec;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/kik_worker.rs:95:45
[INFO] [stdout]    |
[INFO] [stdout] 95 | ...                   std::mem::drop(self);
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^----^
[INFO] [stdout]    |                                      |
[INFO] [stdout]    |                                      argument has type `&Worker<T, R, S>`
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 95 -                                             std::mem::drop(self);
[INFO] [stdout] 95 +                                             let _ = self;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_worker.rs:108:21
[INFO] [stdout]     |
[INFO] [stdout] 108 |                     std::mem::drop(self);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^----^
[INFO] [stdout]     |                                    |
[INFO] [stdout]     |                                    argument has type `&Worker<T, R, S>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 108 -                     std::mem::drop(self);
[INFO] [stdout] 108 +                     let _ = self;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_worker.rs:155:9
[INFO] [stdout]     |
[INFO] [stdout] 155 |         std::mem::drop(&self.tx_deliverer);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^------------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&SyncSender<S>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 155 -         std::mem::drop(&self.tx_deliverer);
[INFO] [stdout] 155 +         let _ = &self.tx_deliverer;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_worker.rs:156:9
[INFO] [stdout]     |
[INFO] [stdout] 156 |         std::mem::drop(&self.rx_inserter);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^-----------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&std::sync::Weak<Mutex<std::sync::mpsc::Receiver<S>>>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 156 -         std::mem::drop(&self.rx_inserter);
[INFO] [stdout] 156 +         let _ = &self.rx_inserter;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_feeder.rs:244:9
[INFO] [stdout]     |
[INFO] [stdout] 244 |         std::mem::drop(&self.input_vec);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^---------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&Vec<R>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 244 -         std::mem::drop(&self.input_vec);
[INFO] [stdout] 244 +         let _ = &self.input_vec;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_feeder.rs:245:9
[INFO] [stdout]     |
[INFO] [stdout] 245 |         std::mem::drop(&self.rx_deliverer);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^------------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&std::sync::mpsc::Receiver<S>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 245 -         std::mem::drop(&self.rx_deliverer);
[INFO] [stdout] 245 +         let _ = &self.rx_deliverer;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_feeder.rs:246:9
[INFO] [stdout]     |
[INFO] [stdout] 246 |         std::mem::drop(&self.tx_inserter);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^-----------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&SyncSender<S>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 246 -         std::mem::drop(&self.tx_inserter);
[INFO] [stdout] 246 +         let _ = &self.tx_inserter;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_channel.rs:272:21
[INFO] [stdout]     |
[INFO] [stdout] 272 |                     std::mem::drop(&lock);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^-----^
[INFO] [stdout]     |                                    |
[INFO] [stdout]     |                                    argument has type `&MutexGuard<'_, std::sync::mpsc::Receiver<S>>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 272 -                     std::mem::drop(&lock);
[INFO] [stdout] 272 +                     let _ = &lock;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_channel.rs:286:9
[INFO] [stdout]     |
[INFO] [stdout] 286 |         std::mem::drop(&self.rx_inserter);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^-----------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&Arc<Mutex<std::sync::mpsc::Receiver<S>>>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 286 -         std::mem::drop(&self.rx_inserter);
[INFO] [stdout] 286 +         let _ = &self.rx_inserter;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_channel.rs:287:9
[INFO] [stdout]     |
[INFO] [stdout] 287 |         std::mem::drop(&self.feeder);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&FeederRecycler<T, R, S>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 287 -         std::mem::drop(&self.feeder);
[INFO] [stdout] 287 +         let _ = &self.feeder;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_channel.rs:288:9
[INFO] [stdout]     |
[INFO] [stdout] 288 |         std::mem::drop(&self.tx_deliverer);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^------------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&SyncSender<S>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 288 -         std::mem::drop(&self.tx_deliverer);
[INFO] [stdout] 288 +         let _ = &self.tx_deliverer;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_channel.rs:289:9
[INFO] [stdout]     |
[INFO] [stdout] 289 |         std::mem::drop(&self.thread_vec);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^----------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&Vec<JoinHandle<()>>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 289 -         std::mem::drop(&self.thread_vec);
[INFO] [stdout] 289 +         let _ = &self.thread_vec;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/kik_worker.rs:95:45
[INFO] [stdout]    |
[INFO] [stdout] 95 | ...                   std::mem::drop(self);
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^----^
[INFO] [stdout]    |                                      |
[INFO] [stdout]    |                                      argument has type `&Worker<T, R, S>`
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 95 -                                             std::mem::drop(self);
[INFO] [stdout] 95 +                                             let _ = self;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_worker.rs:108:21
[INFO] [stdout]     |
[INFO] [stdout] 108 |                     std::mem::drop(self);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^----^
[INFO] [stdout]     |                                    |
[INFO] [stdout]     |                                    argument has type `&Worker<T, R, S>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 108 -                     std::mem::drop(self);
[INFO] [stdout] 108 +                     let _ = self;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_worker.rs:155:9
[INFO] [stdout]     |
[INFO] [stdout] 155 |         std::mem::drop(&self.tx_deliverer);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^------------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&SyncSender<S>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 155 -         std::mem::drop(&self.tx_deliverer);
[INFO] [stdout] 155 +         let _ = &self.tx_deliverer;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_worker.rs:156:9
[INFO] [stdout]     |
[INFO] [stdout] 156 |         std::mem::drop(&self.rx_inserter);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^-----------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&std::sync::Weak<Mutex<std::sync::mpsc::Receiver<S>>>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 156 -         std::mem::drop(&self.rx_inserter);
[INFO] [stdout] 156 +         let _ = &self.rx_inserter;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_feeder.rs:244:9
[INFO] [stdout]     |
[INFO] [stdout] 244 |         std::mem::drop(&self.input_vec);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^---------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&Vec<R>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 244 -         std::mem::drop(&self.input_vec);
[INFO] [stdout] 244 +         let _ = &self.input_vec;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_feeder.rs:245:9
[INFO] [stdout]     |
[INFO] [stdout] 245 |         std::mem::drop(&self.rx_deliverer);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^------------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&std::sync::mpsc::Receiver<S>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 245 -         std::mem::drop(&self.rx_deliverer);
[INFO] [stdout] 245 +         let _ = &self.rx_deliverer;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/kik_feeder.rs:246:9
[INFO] [stdout]     |
[INFO] [stdout] 246 |         std::mem::drop(&self.tx_inserter);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^-----------------^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&SyncSender<S>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 246 -         std::mem::drop(&self.tx_inserter);
[INFO] [stdout] 246 +         let _ = &self.tx_inserter;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.30s
[INFO] running `Command { std: "docker" "inspect" "dd706d2c3f2cf0fedaed43e90e762dabfb7d8d78fc163784f09147079ac8ebad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd706d2c3f2cf0fedaed43e90e762dabfb7d8d78fc163784f09147079ac8ebad", kill_on_drop: false }`
[INFO] [stdout] dd706d2c3f2cf0fedaed43e90e762dabfb7d8d78fc163784f09147079ac8ebad