[INFO] fetching crate llrb 0.0.1...
[INFO] checking llrb-0.0.1 against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] extracting crate llrb 0.0.1 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate llrb 0.0.1 on toolchain 7014e13d5becc920d4bea3cd87942c8a13d359bf
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate llrb 0.0.1
[INFO] finished tweaking crates.io crate llrb 0.0.1
[INFO] tweaked toml for crates.io crate llrb 0.0.1 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "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" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 983768ef9854a644c43bf5d283621b0f2d220f51cd141f966c7c63cd55319dde
[INFO] running `Command { std: "docker" "start" "-a" "983768ef9854a644c43bf5d283621b0f2d220f51cd141f966c7c63cd55319dde", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "983768ef9854a644c43bf5d283621b0f2d220f51cd141f966c7c63cd55319dde", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "983768ef9854a644c43bf5d283621b0f2d220f51cd141f966c7c63cd55319dde", kill_on_drop: false }`
[INFO] [stdout] 983768ef9854a644c43bf5d283621b0f2d220f51cd141f966c7c63cd55319dde
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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 -Dtail_expr_drop_order" "-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9bcd2d3940a995f92c4e75b6787ca5d1cbdd4f80630ad5ff3719e9d967160af5
[INFO] running `Command { std: "docker" "start" "-a" "9bcd2d3940a995f92c4e75b6787ca5d1cbdd4f80630ad5ff3719e9d967160af5", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr]     Checking llrb v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `right_is_red`
[INFO] [stdout]    --> src/lib.rs:288:13
[INFO] [stdout]     |
[INFO] [stdout] 288 |         let right_is_red = is_red(&self.left);
[INFO] [stdout]     |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_right_is_red`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `val`
[INFO] [stdout]    --> src/lib.rs:289:43
[INFO] [stdout]     |
[INFO] [stdout] 289 |         if let Some((ref mut key, ref mut val)) = self.kv {
[INFO] [stdout]     |                                           ^^^ help: if this is intentional, prefix it with an underscore: `_val`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]    --> src/lib.rs:335:30
[INFO] [stdout]     |
[INFO] [stdout] 335 |     pub fn append(&mut self, other: &mut Self) {}
[INFO] [stdout]     |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `move_red_right`, `move_red_left`, and `min` are never used
[INFO] [stdout]    --> src/lib.rs:92:8
[INFO] [stdout]     |
[INFO] [stdout] 49  | impl<K: Ord, V> LLRB<K, V> {
[INFO] [stdout]     | -------------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 92  |     fn move_red_right(&mut self) {}
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 93  |
[INFO] [stdout] 94  |     fn move_red_left(&mut self) {}
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 303 |     fn min(&self) -> &LLRB<K, V> {
[INFO] [stdout]     |        ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right_is_red`
[INFO] [stdout]    --> src/lib.rs:288:13
[INFO] [stdout]     |
[INFO] [stdout] 288 |         let right_is_red = is_red(&self.left);
[INFO] [stdout]     |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_right_is_red`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `val`
[INFO] [stdout]    --> src/lib.rs:289:43
[INFO] [stdout]     |
[INFO] [stdout] 289 |         if let Some((ref mut key, ref mut val)) = self.kv {
[INFO] [stdout]     |                                           ^^^ help: if this is intentional, prefix it with an underscore: `_val`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]    --> src/lib.rs:335:30
[INFO] [stdout]     |
[INFO] [stdout] 335 |     pub fn append(&mut self, other: &mut Self) {}
[INFO] [stdout]     |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `move_red_right`, `move_red_left`, and `min` are never used
[INFO] [stdout]    --> src/lib.rs:92:8
[INFO] [stdout]     |
[INFO] [stdout] 49  | impl<K: Ord, V> LLRB<K, V> {
[INFO] [stdout]     | -------------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 92  |     fn move_red_right(&mut self) {}
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 93  |
[INFO] [stdout] 94  |     fn move_red_left(&mut self) {}
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 303 |     fn min(&self) -> &LLRB<K, V> {
[INFO] [stdout]     |        ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.20s
[INFO] running `Command { std: "docker" "inspect" "9bcd2d3940a995f92c4e75b6787ca5d1cbdd4f80630ad5ff3719e9d967160af5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9bcd2d3940a995f92c4e75b6787ca5d1cbdd4f80630ad5ff3719e9d967160af5", kill_on_drop: false }`
[INFO] [stdout] 9bcd2d3940a995f92c4e75b6787ca5d1cbdd4f80630ad5ff3719e9d967160af5