[INFO] crate rust_black_tree 0.1.5 is already in cache
[INFO] checking rust_black_tree-0.1.5 against master#ba72b15666b2491415aec703a02c2364fe5e2790 for pr-71140
[INFO] extracting crate rust_black_tree 0.1.5 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate rust_black_tree 0.1.5 on toolchain ba72b15666b2491415aec703a02c2364fe5e2790
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ba72b15666b2491415aec703a02c2364fe5e2790" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate rust_black_tree 0.1.5
[INFO] finished tweaking crates.io crate rust_black_tree 0.1.5
[INFO] tweaked toml for crates.io crate rust_black_tree 0.1.5 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate rust_black_tree 0.1.5 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ba72b15666b2491415aec703a02c2364fe5e2790" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+ba72b15666b2491415aec703a02c2364fe5e2790" "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] ec58ac1a6cf17c90238b9496ccde7c57d74362ff2ff05955e2034e2e81d4bebd
[INFO] running `"docker" "start" "-a" "ec58ac1a6cf17c90238b9496ccde7c57d74362ff2ff05955e2034e2e81d4bebd"`
[INFO] [stderr]     Checking regex-syntax v0.6.15
[INFO] [stderr]     Checking regex-automata v0.1.8
[INFO] [stderr]     Checking tinytemplate v1.0.3
[INFO] [stderr]     Checking lexical-core v0.6.7
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]     Checking nix v0.14.1
[INFO] [stderr]     Checking term_size v0.3.1
[INFO] [stderr]     Checking isatty v0.1.9
[INFO] [stderr]     Checking crossbeam-utils v0.7.2
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking bstr v0.2.11
[INFO] [stderr]     Checking crossbeam-epoch v0.8.2
[INFO] [stderr]     Checking crossbeam-queue v0.2.1
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking rayon-core v1.7.0
[INFO] [stderr]     Checking csv v1.1.3
[INFO] [stderr]     Checking regex v1.3.4
[INFO] [stderr]     Checking rayon v1.3.0
[INFO] [stderr]     Checking nom v5.1.1
[INFO] [stderr]     Checking rustyline v6.0.0
[INFO] [stderr]     Checking criterion v0.3.1
[INFO] [stderr]     Checking rust_black_tree v0.1.5 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::iter`
[INFO] [stderr]  --> benches/my_benchmark.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::iter;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Throughput`
[INFO] [stderr]  --> benches/my_benchmark.rs:3:74
[INFO] [stderr]   |
[INFO] [stderr] 3 | use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion, Throughput};
[INFO] [stderr]   |                                                                          ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 15.63s
[INFO] running `"docker" "inspect" "ec58ac1a6cf17c90238b9496ccde7c57d74362ff2ff05955e2034e2e81d4bebd"`
[INFO] running `"docker" "rm" "-f" "ec58ac1a6cf17c90238b9496ccde7c57d74362ff2ff05955e2034e2e81d4bebd"`
[INFO] [stdout] ec58ac1a6cf17c90238b9496ccde7c57d74362ff2ff05955e2034e2e81d4bebd