[INFO] crate arc_ast 0.0.1 is already in cache
[INFO] checking arc_ast-0.0.1 against try#e6563ac70cbfd3196492061900e9e9793e065e4d for pr-69410
[INFO] extracting crate arc_ast 0.0.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate arc_ast 0.0.1 on toolchain e6563ac70cbfd3196492061900e9e9793e065e4d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e6563ac70cbfd3196492061900e9e9793e065e4d" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate arc_ast 0.0.1
[INFO] finished tweaking crates.io crate arc_ast 0.0.1
[INFO] tweaked toml for crates.io crate arc_ast 0.0.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e6563ac70cbfd3196492061900e9e9793e065e4d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e6563ac70cbfd3196492061900e9e9793e065e4d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e6563ac70cbfd3196492061900e9e9793e065e4d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 23014343f8ee97756929629d8c673888769162aa3279df8da674fb31a27a6f22
[INFO] running `"docker" "start" "-a" "23014343f8ee97756929629d8c673888769162aa3279df8da674fb31a27a6f22"`
[INFO] [stderr]     Checking arc_number v0.0.1
[INFO] [stderr]     Checking arc_ast v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: variable `length` is assigned to, but never used
[INFO] [stderr]   --> src/utils/ast_traits.rs:18:25
[INFO] [stderr]    |
[INFO] [stderr] 18 |                 let mut length = 0;
[INFO] [stderr]    |                         ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr]    = note: consider using `_length` instead
[INFO] [stderr] 
[INFO] [stderr] warning: variable `length` is assigned to, but never used
[INFO] [stderr]   --> src/utils/ast_traits.rs:18:25
[INFO] [stderr]    |
[INFO] [stderr] 18 |                 let mut length = 0;
[INFO] [stderr]    |                         ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr]    = note: consider using `_length` instead
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.84s
[INFO] running `"docker" "inspect" "23014343f8ee97756929629d8c673888769162aa3279df8da674fb31a27a6f22"`
[INFO] running `"docker" "rm" "-f" "23014343f8ee97756929629d8c673888769162aa3279df8da674fb31a27a6f22"`
[INFO] [stdout] 23014343f8ee97756929629d8c673888769162aa3279df8da674fb31a27a6f22