[INFO] cloning repository https://github.com/aviplayer/rust_linked_list
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/aviplayer/rust_linked_list" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faviplayer%2Frust_linked_list", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faviplayer%2Frust_linked_list'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d785774981503a78cbc109e8f4aa3277757139fc
[INFO] testing aviplayer/rust_linked_list against master#62efba8a050c64249dab942951bb28f710208bc8 for pr-90799
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faviplayer%2Frust_linked_list" "/workspace/builds/worker-75/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-75/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/aviplayer/rust_linked_list on toolchain 62efba8a050c64249dab942951bb28f710208bc8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/aviplayer/rust_linked_list
[INFO] finished tweaking git repo https://github.com/aviplayer/rust_linked_list
[INFO] tweaked toml for git repo https://github.com/aviplayer/rust_linked_list written to /workspace/builds/worker-75/source/Cargo.toml
[INFO] crate git repo https://github.com/aviplayer/rust_linked_list already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7a6d07c24dccdb0baf324c56dd22583271808c699a11308aba9417c9bba885c9
[INFO] running `Command { std: "docker" "start" "-a" "7a6d07c24dccdb0baf324c56dd22583271808c699a11308aba9417c9bba885c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7a6d07c24dccdb0baf324c56dd22583271808c699a11308aba9417c9bba885c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a6d07c24dccdb0baf324c56dd22583271808c699a11308aba9417c9bba885c9", kill_on_drop: false }`
[INFO] [stdout] 7a6d07c24dccdb0baf324c56dd22583271808c699a11308aba9417c9bba885c9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 78e7e9cedc4d5d4333808e3f289475ac17e9ff016dbc720cbe349400f7f64073
[INFO] running `Command { std: "docker" "start" "-a" "78e7e9cedc4d5d4333808e3f289475ac17e9ff016dbc720cbe349400f7f64073", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling list v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:84:13
[INFO] [stdout]    |
[INFO] [stdout] 84 |         let mut prev = self.get_nth_node_mut(index - 2);
[INFO] [stdout]    |             ----^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.50s
[INFO] running `Command { std: "docker" "inspect" "78e7e9cedc4d5d4333808e3f289475ac17e9ff016dbc720cbe349400f7f64073", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "78e7e9cedc4d5d4333808e3f289475ac17e9ff016dbc720cbe349400f7f64073", kill_on_drop: false }`
[INFO] [stdout] 78e7e9cedc4d5d4333808e3f289475ac17e9ff016dbc720cbe349400f7f64073
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dea7a93f62f5c26de60672a54446c7d18b523a4f1038b6d65209c63a542d5ff4
[INFO] running `Command { std: "docker" "start" "-a" "dea7a93f62f5c26de60672a54446c7d18b523a4f1038b6d65209c63a542d5ff4", kill_on_drop: false }`
[INFO] [stderr]    Compiling list v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:84:13
[INFO] [stdout]    |
[INFO] [stdout] 84 |         let mut prev = self.get_nth_node_mut(index - 2);
[INFO] [stdout]    |             ----^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.39s
[INFO] running `Command { std: "docker" "inspect" "dea7a93f62f5c26de60672a54446c7d18b523a4f1038b6d65209c63a542d5ff4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dea7a93f62f5c26de60672a54446c7d18b523a4f1038b6d65209c63a542d5ff4", kill_on_drop: false }`
[INFO] [stdout] dea7a93f62f5c26de60672a54446c7d18b523a4f1038b6d65209c63a542d5ff4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 7d6f4ef90830c4a57df0ca5e10900d11e94561de2aa207b77d5f98195d60f2d6
[INFO] running `Command { std: "docker" "start" "-a" "7d6f4ef90830c4a57df0ca5e10900d11e94561de2aa207b77d5f98195d60f2d6", kill_on_drop: false }`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:84:13
[INFO] [stderr]    |
[INFO] [stderr] 84 |         let mut prev = self.get_nth_node_mut(index - 2);
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `list` (bin "list" test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/list-1947d1cf0af89032)
[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] 
[ERROR] error running command: no output for 300 seconds
[INFO] running `Command { std: "docker" "inspect" "7d6f4ef90830c4a57df0ca5e10900d11e94561de2aa207b77d5f98195d60f2d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d6f4ef90830c4a57df0ca5e10900d11e94561de2aa207b77d5f98195d60f2d6", kill_on_drop: false }`
[INFO] [stdout] 7d6f4ef90830c4a57df0ca5e10900d11e94561de2aa207b77d5f98195d60f2d6