[INFO] cloning repository https://github.com/queuedq/exact-cover-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/queuedq/exact-cover-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fqueuedq%2Fexact-cover-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fqueuedq%2Fexact-cover-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4243e392d16ba44917ad6ffb5c3f6b1bafbd4774
[INFO] testing queuedq/exact-cover-rs against master#99e3aef02079e9c10583638520cd0c134dc3a01d for pr-85530
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fqueuedq%2Fexact-cover-rs" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/queuedq/exact-cover-rs on toolchain 99e3aef02079e9c10583638520cd0c134dc3a01d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/queuedq/exact-cover-rs
[INFO] finished tweaking git repo https://github.com/queuedq/exact-cover-rs
[INFO] tweaked toml for git repo https://github.com/queuedq/exact-cover-rs written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/queuedq/exact-cover-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7dd4a74c29a722d6026e3d20430d0ff706011e36ab6fafc99e798016b2c12cb1
[INFO] running `Command { std: "docker" "start" "-a" "7dd4a74c29a722d6026e3d20430d0ff706011e36ab6fafc99e798016b2c12cb1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7dd4a74c29a722d6026e3d20430d0ff706011e36ab6fafc99e798016b2c12cb1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7dd4a74c29a722d6026e3d20430d0ff706011e36ab6fafc99e798016b2c12cb1", kill_on_drop: false }`
[INFO] [stdout] 7dd4a74c29a722d6026e3d20430d0ff706011e36ab6fafc99e798016b2c12cb1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bc3fb1b758679ad95ad882f94766f90808effd6187419a4edc06c7defbc632c7
[INFO] running `Command { std: "docker" "start" "-a" "bc3fb1b758679ad95ad882f94766f90808effd6187419a4edc06c7defbc632c7", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.67
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling futures-core v0.3.13
[INFO] [stderr]    Compiling futures-sink v0.3.13
[INFO] [stderr]    Compiling slab v0.4.2
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling futures-io v0.3.13
[INFO] [stderr]    Compiling futures-task v0.3.13
[INFO] [stderr]    Compiling futures-channel v0.3.13
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling futures-macro v0.3.13
[INFO] [stderr]    Compiling futures-util v0.3.13
[INFO] [stderr]    Compiling futures-executor v0.3.13
[INFO] [stderr]    Compiling futures v0.3.13
[INFO] [stderr]    Compiling exact-cover v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `Aborted`
[INFO] [stdout]   --> src/solver.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     Aborted(Matrix),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `problem`
[INFO] [stdout]   --> src/solver.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     problem: Problem<N, C>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `thread`
[INFO] [stdout]    --> src/solver.rs:119:5
[INFO] [stdout]     |
[INFO] [stdout] 119 |     thread: JoinHandle<()>,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `try_recv`
[INFO] [stdout]    --> src/solver.rs:179:12
[INFO] [stdout]     |
[INFO] [stdout] 179 |     pub fn try_recv(&self) -> Result<SolverThreadEvent, TryRecvError> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `join`
[INFO] [stdout]    --> src/solver.rs:187:12
[INFO] [stdout]     |
[INFO] [stdout] 187 |     pub fn join(self) -> ThreadResult<()> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.51s
[INFO] running `Command { std: "docker" "inspect" "bc3fb1b758679ad95ad882f94766f90808effd6187419a4edc06c7defbc632c7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bc3fb1b758679ad95ad882f94766f90808effd6187419a4edc06c7defbc632c7", kill_on_drop: false }`
[INFO] [stdout] bc3fb1b758679ad95ad882f94766f90808effd6187419a4edc06c7defbc632c7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ce3e935caa0b5cffeddc805e4f1f76c3b8ef851788da6197e89337e364da2c96
[INFO] running `Command { std: "docker" "start" "-a" "ce3e935caa0b5cffeddc805e4f1f76c3b8ef851788da6197e89337e364da2c96", kill_on_drop: false }`
[INFO] [stderr]    Compiling exact-cover v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `Aborted`
[INFO] [stdout]   --> src/solver.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     Aborted(Matrix),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `problem`
[INFO] [stdout]   --> src/solver.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     problem: Problem<N, C>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `thread`
[INFO] [stdout]    --> src/solver.rs:119:5
[INFO] [stdout]     |
[INFO] [stdout] 119 |     thread: JoinHandle<()>,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `try_recv`
[INFO] [stdout]    --> src/solver.rs:179:12
[INFO] [stdout]     |
[INFO] [stdout] 179 |     pub fn try_recv(&self) -> Result<SolverThreadEvent, TryRecvError> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `join`
[INFO] [stdout]    --> src/solver.rs:187:12
[INFO] [stdout]     |
[INFO] [stdout] 187 |     pub fn join(self) -> ThreadResult<()> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]    --> src/dlx.rs:222:9
[INFO] [stdout]     |
[INFO] [stdout] 222 |     use super::*;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Aborted`
[INFO] [stdout]   --> src/solver.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     Aborted(Matrix),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `problem`
[INFO] [stdout]   --> src/solver.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     problem: Problem<N, C>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `thread`
[INFO] [stdout]    --> src/solver.rs:119:5
[INFO] [stdout]     |
[INFO] [stdout] 119 |     thread: JoinHandle<()>,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `try_recv`
[INFO] [stdout]    --> src/solver.rs:179:12
[INFO] [stdout]     |
[INFO] [stdout] 179 |     pub fn try_recv(&self) -> Result<SolverThreadEvent, TryRecvError> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `join`
[INFO] [stdout]    --> src/solver.rs:187:12
[INFO] [stdout]     |
[INFO] [stdout] 187 |     pub fn join(self) -> ThreadResult<()> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.61s
[INFO] running `Command { std: "docker" "inspect" "ce3e935caa0b5cffeddc805e4f1f76c3b8ef851788da6197e89337e364da2c96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce3e935caa0b5cffeddc805e4f1f76c3b8ef851788da6197e89337e364da2c96", kill_on_drop: false }`
[INFO] [stdout] ce3e935caa0b5cffeddc805e4f1f76c3b8ef851788da6197e89337e364da2c96
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 88df4b1388d13f4a63a7b3be163518125d51d08b86c3de4669f334b796debe4e
[INFO] running `Command { std: "docker" "start" "-a" "88df4b1388d13f4a63a7b3be163518125d51d08b86c3de4669f334b796debe4e", kill_on_drop: false }`
[INFO] [stderr] warning: variant is never constructed: `Aborted`
[INFO] [stderr]   --> src/solver.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     Aborted(Matrix),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `problem`
[INFO] [stderr]   --> src/solver.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     problem: Problem<N, C>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `thread`
[INFO] [stderr]    --> src/solver.rs:119:5
[INFO] [stderr]     |
[INFO] [stderr] 119 |     thread: JoinHandle<()>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `try_recv`
[INFO] [stderr]    --> src/solver.rs:179:12
[INFO] [stderr]     |
[INFO] [stderr] 179 |     pub fn try_recv(&self) -> Result<SolverThreadEvent, TryRecvError> {
[INFO] [stderr]     |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `join`
[INFO] [stderr]    --> src/solver.rs:187:12
[INFO] [stderr]     |
[INFO] [stderr] 187 |     pub fn join(self) -> ThreadResult<()> {
[INFO] [stderr]     |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]    --> src/dlx.rs:222:9
[INFO] [stderr]     |
[INFO] [stderr] 222 |     use super::*;
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Aborted`
[INFO] [stderr]   --> src/solver.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     Aborted(Matrix),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `problem`
[INFO] [stderr]   --> src/solver.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     problem: Problem<N, C>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `thread`
[INFO] [stderr]    --> src/solver.rs:119:5
[INFO] [stderr]     |
[INFO] [stderr] 119 |     thread: JoinHandle<()>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `try_recv`
[INFO] [stderr]    --> src/solver.rs:179:12
[INFO] [stderr]     |
[INFO] [stderr] 179 |     pub fn try_recv(&self) -> Result<SolverThreadEvent, TryRecvError> {
[INFO] [stderr]     |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `join`
[INFO] [stderr]    --> src/solver.rs:187:12
[INFO] [stderr]     |
[INFO] [stderr] 187 |     pub fn join(self) -> ThreadResult<()> {
[INFO] [stderr]     |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 6 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/exact_cover-f5271b0e50f26e45)
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test dlx::tests::matrix_search_should_solve_exact_cover ... ok
[INFO] [stdout] test problem::tests::problem_can_be_created ... ok
[INFO] [stdout] test solver::tests::solver_can_solve_problem ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests exact-cover
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "88df4b1388d13f4a63a7b3be163518125d51d08b86c3de4669f334b796debe4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88df4b1388d13f4a63a7b3be163518125d51d08b86c3de4669f334b796debe4e", kill_on_drop: false }`
[INFO] [stdout] 88df4b1388d13f4a63a7b3be163518125d51d08b86c3de4669f334b796debe4e