[INFO] fetching crate exact-covers 0.2.1...
[INFO] checking exact-covers-0.2.1 against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] extracting crate exact-covers 0.2.1 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate exact-covers 0.2.1 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 exact-covers 0.2.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate exact-covers 0.2.1
[INFO] tweaked toml for crates.io crate exact-covers 0.2.1 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate crates.io crate exact-covers 0.2.1 already has a lockfile, it will not be regenerated
[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]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 65661b5e71f47c27c09b3bd8a282d62911c9a8e7ab6bbe166e50ecf9679ba316
[INFO] running `Command { std: "docker" "start" "-a" "65661b5e71f47c27c09b3bd8a282d62911c9a8e7ab6bbe166e50ecf9679ba316", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "65661b5e71f47c27c09b3bd8a282d62911c9a8e7ab6bbe166e50ecf9679ba316", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "65661b5e71f47c27c09b3bd8a282d62911c9a8e7ab6bbe166e50ecf9679ba316", kill_on_drop: false }`
[INFO] [stdout] 65661b5e71f47c27c09b3bd8a282d62911c9a8e7ab6bbe166e50ecf9679ba316
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 4fbbffe311b30f85e0d54c1882b723c41de4088f0cf90e17e1960faf1e77b6f7
[INFO] running `Command { std: "docker" "start" "-a" "4fbbffe311b30f85e0d54c1882b723c41de4088f0cf90e17e1960faf1e77b6f7", kill_on_drop: false }`
[INFO] [stderr]     Checking smallvec v2.0.0-alpha.6
[INFO] [stderr]     Checking exact-covers v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `primary`
[INFO] [stdout]   --> src/dc.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn new(primary: &'i [I], secondary: &'i [I]) -> Self {
[INFO] [stdout]    |            ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_primary`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `secondary`
[INFO] [stdout]   --> src/dc.rs:14:30
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn new(primary: &'i [I], secondary: &'i [I]) -> Self {
[INFO] [stdout]    |                              ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_secondary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `primary`
[INFO] [stdout]   --> src/dc.rs:18:36
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn add_option<P, S>(&mut self, primary: P, secondary: S)
[INFO] [stdout]    |                                    ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_primary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `secondary`
[INFO] [stdout]   --> src/dc.rs:18:48
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn add_option<P, S>(&mut self, primary: P, secondary: S)
[INFO] [stdout]    |                                                ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_secondary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visit`
[INFO] [stdout]   --> src/dc.rs:26:23
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn solve<F>(self, visit: F)
[INFO] [stdout]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_visit`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `level`
[INFO] [stdout]   --> src/dc.rs:35:23
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn pointer(&self, level: usize) -> Option<InstIndex> {
[INFO] [stdout]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_level`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ix`
[INFO] [stdout]   --> src/dc.rs:43:25
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn option_of(&self, ix: InstIndex, result: &mut Vec<&'i I>) {
[INFO] [stdout]    |                         ^^ help: if this is intentional, prefix it with an underscore: `_ix`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]   --> src/dc.rs:43:40
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn option_of(&self, ix: InstIndex, result: &mut Vec<&'i I>) {
[INFO] [stdout]    |                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `primary`
[INFO] [stdout]   --> src/dc.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn new(primary: &'i [I], secondary: &'i [I]) -> Self {
[INFO] [stdout]    |            ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_primary`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `secondary`
[INFO] [stdout]   --> src/dc.rs:14:30
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn new(primary: &'i [I], secondary: &'i [I]) -> Self {
[INFO] [stdout]    |                              ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_secondary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `primary`
[INFO] [stdout]   --> src/dc.rs:18:36
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn add_option<P, S>(&mut self, primary: P, secondary: S)
[INFO] [stdout]    |                                    ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_primary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `secondary`
[INFO] [stdout]   --> src/dc.rs:18:48
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn add_option<P, S>(&mut self, primary: P, secondary: S)
[INFO] [stdout]    |                                                ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_secondary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visit`
[INFO] [stdout]   --> src/dc.rs:26:23
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn solve<F>(self, visit: F)
[INFO] [stdout]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_visit`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `level`
[INFO] [stdout]   --> src/dc.rs:35:23
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn pointer(&self, level: usize) -> Option<InstIndex> {
[INFO] [stdout]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_level`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ix`
[INFO] [stdout]   --> src/dc.rs:43:25
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn option_of(&self, ix: InstIndex, result: &mut Vec<&'i I>) {
[INFO] [stdout]    |                         ^^ help: if this is intentional, prefix it with an underscore: `_ix`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]   --> src/dc.rs:43:40
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn option_of(&self, ix: InstIndex, result: &mut Vec<&'i I>) {
[INFO] [stdout]    |                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.65s
[INFO] running `Command { std: "docker" "inspect" "4fbbffe311b30f85e0d54c1882b723c41de4088f0cf90e17e1960faf1e77b6f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4fbbffe311b30f85e0d54c1882b723c41de4088f0cf90e17e1960faf1e77b6f7", kill_on_drop: false }`
[INFO] [stdout] 4fbbffe311b30f85e0d54c1882b723c41de4088f0cf90e17e1960faf1e77b6f7