[INFO] cloning repository https://github.com/voith/rusty-structures
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/voith/rusty-structures" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvoith%2Frusty-structures", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvoith%2Frusty-structures'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c01247201e2db221a38cb52895368032d3398948
[INFO] checking voith/rusty-structures against try#81ab7f2139295590561adbe6d5b0aaa2feff765f for pr-146470-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvoith%2Frusty-structures" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/voith/rusty-structures
[INFO] finished tweaking git repo https://github.com/voith/rusty-structures
[INFO] tweaked toml for git repo https://github.com/voith/rusty-structures written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/voith/rusty-structures on toolchain 81ab7f2139295590561adbe6d5b0aaa2feff765f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+81ab7f2139295590561adbe6d5b0aaa2feff765f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/voith/rusty-structures 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" "+81ab7f2139295590561adbe6d5b0aaa2feff765f" "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
[ERROR] error running command: no output for 300 seconds
[INFO] checking voith/rusty-structures against try#81ab7f2139295590561adbe6d5b0aaa2feff765f for pr-146470-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvoith%2Frusty-structures" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/voith/rusty-structures
[INFO] finished tweaking git repo https://github.com/voith/rusty-structures
[INFO] tweaked toml for git repo https://github.com/voith/rusty-structures written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/voith/rusty-structures on toolchain 81ab7f2139295590561adbe6d5b0aaa2feff765f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+81ab7f2139295590561adbe6d5b0aaa2feff765f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/voith/rusty-structures 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" "+81ab7f2139295590561adbe6d5b0aaa2feff765f" "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-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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+81ab7f2139295590561adbe6d5b0aaa2feff765f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 24f5410eb7dd3daa9904e0546f959504962bdfcbfda6523aee6967ed49807d50
[INFO] running `Command { std: "docker" "start" "-a" "24f5410eb7dd3daa9904e0546f959504962bdfcbfda6523aee6967ed49807d50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "24f5410eb7dd3daa9904e0546f959504962bdfcbfda6523aee6967ed49807d50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "24f5410eb7dd3daa9904e0546f959504962bdfcbfda6523aee6967ed49807d50", kill_on_drop: false }`
[INFO] [stdout] 24f5410eb7dd3daa9904e0546f959504962bdfcbfda6523aee6967ed49807d50
[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" "-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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+81ab7f2139295590561adbe6d5b0aaa2feff765f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4308198d3c7719ea330f7beca4252c33873c6f03fe768584a47ccdea2052c238
[INFO] running `Command { std: "docker" "start" "-a" "4308198d3c7719ea330f7beca4252c33873c6f03fe768584a47ccdea2052c238", kill_on_drop: false }`
[INFO] [stderr]     Checking data_structures v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary braces around assigned value
[INFO] [stdout]    --> src/dancing_links.rs:224:28
[INFO] [stdout]     |
[INFO] [stdout] 224 |             current_node = { current_node.borrow().up.clone().unwrap() };
[INFO] [stdout]     |                            ^^                                         ^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_braces)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]     |
[INFO] [stdout] 224 -             current_node = { current_node.borrow().up.clone().unwrap() };
[INFO] [stdout] 224 +             current_node = current_node.borrow().up.clone().unwrap() ;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around assigned value
[INFO] [stdout]    --> src/dancing_links.rs:263:21
[INFO] [stdout]     |
[INFO] [stdout] 263 |                 c = { c.borrow().right.clone().unwrap() };
[INFO] [stdout]     |                     ^^                                 ^^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]     |
[INFO] [stdout] 263 -                 c = { c.borrow().right.clone().unwrap() };
[INFO] [stdout] 263 +                 c = c.borrow().right.clone().unwrap() ;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around assigned value
[INFO] [stdout]    --> src/dancing_links.rs:224:28
[INFO] [stdout]     |
[INFO] [stdout] 224 |             current_node = { current_node.borrow().up.clone().unwrap() };
[INFO] [stdout]     |                            ^^                                         ^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_braces)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]     |
[INFO] [stdout] 224 -             current_node = { current_node.borrow().up.clone().unwrap() };
[INFO] [stdout] 224 +             current_node = current_node.borrow().up.clone().unwrap() ;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around assigned value
[INFO] [stdout]    --> src/dancing_links.rs:263:21
[INFO] [stdout]     |
[INFO] [stdout] 263 |                 c = { c.borrow().right.clone().unwrap() };
[INFO] [stdout]     |                     ^^                                 ^^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]     |
[INFO] [stdout] 263 -                 c = { c.borrow().right.clone().unwrap() };
[INFO] [stdout] 263 +                 c = c.borrow().right.clone().unwrap() ;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.27s
[INFO] running `Command { std: "docker" "inspect" "4308198d3c7719ea330f7beca4252c33873c6f03fe768584a47ccdea2052c238", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4308198d3c7719ea330f7beca4252c33873c6f03fe768584a47ccdea2052c238", kill_on_drop: false }`
[INFO] [stdout] 4308198d3c7719ea330f7beca4252c33873c6f03fe768584a47ccdea2052c238