[INFO] cloning repository https://github.com/repairing-yu/rust-red-black-tree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/repairing-yu/rust-red-black-tree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frepairing-yu%2Frust-red-black-tree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frepairing-yu%2Frust-red-black-tree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8c983187429e1c569975f82ca33619e541d5cc32
[INFO] checking repairing-yu/rust-red-black-tree against try#da0275e101cdc809ce291ed8b64d6f82c6b65467 for pr-134276
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frepairing-yu%2Frust-red-black-tree" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/repairing-yu/rust-red-black-tree on toolchain da0275e101cdc809ce291ed8b64d6f82c6b65467
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+da0275e101cdc809ce291ed8b64d6f82c6b65467" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/repairing-yu/rust-red-black-tree
[INFO] finished tweaking git repo https://github.com/repairing-yu/rust-red-black-tree
[INFO] tweaked toml for git repo https://github.com/repairing-yu/rust-red-black-tree written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/repairing-yu/rust-red-black-tree 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" "+da0275e101cdc809ce291ed8b64d6f82c6b65467" "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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+da0275e101cdc809ce291ed8b64d6f82c6b65467" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 983aa8d114ca793b909640930c51b61c40d9f4155fa7f9f03967d82e8e7f2aaf
[INFO] running `Command { std: "docker" "start" "-a" "983aa8d114ca793b909640930c51b61c40d9f4155fa7f9f03967d82e8e7f2aaf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "983aa8d114ca793b909640930c51b61c40d9f4155fa7f9f03967d82e8e7f2aaf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "983aa8d114ca793b909640930c51b61c40d9f4155fa7f9f03967d82e8e7f2aaf", kill_on_drop: false }`
[INFO] [stdout] 983aa8d114ca793b909640930c51b61c40d9f4155fa7f9f03967d82e8e7f2aaf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+da0275e101cdc809ce291ed8b64d6f82c6b65467" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a0d4ff907da52810e25d3c9eec649d17b5d0c1d2a57f5b2eafb402d626f9adb3
[INFO] running `Command { std: "docker" "start" "-a" "a0d4ff907da52810e25d3c9eec649d17b5d0c1d2a57f5b2eafb402d626f9adb3", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.155
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]     Checking getrandom v0.2.15
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking red_black_tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `target_color` is never read
[INFO] [stdout]    --> src/data_structure/red_black_tree.rs:156:21
[INFO] [stdout]     |
[INFO] [stdout] 156 |             let mut target_color = Color::Red;
[INFO] [stdout]     |                     ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `target_color` is never read
[INFO] [stdout]    --> src/data_structure/red_black_tree.rs:156:21
[INFO] [stdout]     |
[INFO] [stdout] 156 |             let mut target_color = Color::Red;
[INFO] [stdout]     |                     ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.77s
[INFO] running `Command { std: "docker" "inspect" "a0d4ff907da52810e25d3c9eec649d17b5d0c1d2a57f5b2eafb402d626f9adb3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a0d4ff907da52810e25d3c9eec649d17b5d0c1d2a57f5b2eafb402d626f9adb3", kill_on_drop: false }`
[INFO] [stdout] a0d4ff907da52810e25d3c9eec649d17b5d0c1d2a57f5b2eafb402d626f9adb3