[INFO] fetching crate rust_black_tree 0.1.5...
[INFO] checking rust_black_tree-0.1.5 against try#9c1dcf141bc0875407c4eb36972857bd3db713e2 for pr-81863
[INFO] extracting crate rust_black_tree 0.1.5 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate rust_black_tree 0.1.5 on toolchain 9c1dcf141bc0875407c4eb36972857bd3db713e2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9c1dcf141bc0875407c4eb36972857bd3db713e2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-12/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 `Command { std: "/workspace/cargo-home/bin/cargo" "+9c1dcf141bc0875407c4eb36972857bd3db713e2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded dirs v2.0.2
[INFO] [stderr]   Downloaded memchr v2.3.3
[INFO] [stderr]   Downloaded void v1.0.2
[INFO] [stderr]   Downloaded unicode-width v0.1.7
[INFO] [stderr]   Downloaded static_assertions v0.3.4
[INFO] [stderr]   Downloaded lexical-core v0.6.7
[INFO] [stderr]   Downloaded rust-argon2 v0.7.0
[INFO] [stderr]   Downloaded constant_time_eq v0.1.5
[INFO] [stderr]   Downloaded dirs-sys v0.3.4
[INFO] [stderr]   Downloaded hermit-abi v0.1.8
[INFO] [stderr]   Downloaded regex-automata v0.1.8
[INFO] [stderr]   Downloaded num_cpus v1.12.0
[INFO] [stderr]   Downloaded memoffset v0.5.3
[INFO] [stderr]   Downloaded rayon-core v1.7.0
[INFO] [stderr]   Downloaded syn v1.0.16
[INFO] [stderr]   Downloaded winapi-util v0.1.3
[INFO] [stderr]   Downloaded isatty v0.1.9
[INFO] [stderr]   Downloaded crossbeam-queue v0.2.1
[INFO] [stderr]   Downloaded num-traits v0.2.11
[INFO] [stderr]   Downloaded either v1.5.3
[INFO] [stderr]   Downloaded byteorder v1.3.4
[INFO] [stderr]   Downloaded term_size v0.3.1
[INFO] [stderr]   Downloaded serde_json v1.0.48
[INFO] [stderr]   Downloaded tinytemplate v1.0.3
[INFO] [stderr]   Downloaded regex v1.3.4
[INFO] [stderr]   Downloaded arrayref v0.3.6
[INFO] [stderr]   Downloaded proc-macro2 v1.0.9
[INFO] [stderr]   Downloaded serde_derive v1.0.104
[INFO] [stderr]   Downloaded criterion-plot v0.4.1
[INFO] [stderr]   Downloaded oorandom v11.1.0
[INFO] [stderr]   Downloaded rustyline v6.0.0
[INFO] [stderr]   Downloaded clap v2.33.0
[INFO] [stderr]   Downloaded nom v5.1.1
[INFO] [stderr]   Downloaded criterion v0.3.1
[INFO] [stderr]   Downloaded arrayvec v0.5.1
[INFO] [stderr]   Downloaded rayon v1.3.0
[INFO] [stderr]   Downloaded nodrop v0.1.14
[INFO] [stderr]   Downloaded arrayvec v0.4.12
[INFO] [stderr]   Downloaded utf8parse v0.1.1
[INFO] [stderr]   Downloaded redox_users v0.3.4
[INFO] [stderr]   Downloaded cfg-if v0.1.9
[INFO] [stderr]   Downloaded nix v0.14.1
[INFO] [stderr]   Downloaded bumpalo v3.2.0
[INFO] [stderr]   Downloaded regex-syntax v0.6.15
[INFO] [stderr]   Downloaded bstr v0.2.11
[INFO] [stderr]   Downloaded plotters v0.2.12
[INFO] [stderr]   Downloaded csv v1.1.3
[INFO] [stderr]   Downloaded blake2b_simd v0.5.10
[INFO] [stderr]   Downloaded libc v0.2.67
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+9c1dcf141bc0875407c4eb36972857bd3db713e2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 16f455bb409799caf88ca16b0e222d485a7ad4e270afaf78b7b40f505a6c65e6
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "16f455bb409799caf88ca16b0e222d485a7ad4e270afaf78b7b40f505a6c65e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "16f455bb409799caf88ca16b0e222d485a7ad4e270afaf78b7b40f505a6c65e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "16f455bb409799caf88ca16b0e222d485a7ad4e270afaf78b7b40f505a6c65e6", kill_on_drop: false }`
[INFO] [stdout] 16f455bb409799caf88ca16b0e222d485a7ad4e270afaf78b7b40f505a6c65e6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+9c1dcf141bc0875407c4eb36972857bd3db713e2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 795a432063803340938374ab8bd8ee2c332529b43f15212f990dfdbe51261a8d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "795a432063803340938374ab8bd8ee2c332529b43f15212f990dfdbe51261a8d", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]    Compiling libc v0.2.67
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]     Checking static_assertions v0.3.4
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]     Checking utf8parse v0.1.1
[INFO] [stderr]     Checking unicode-segmentation v1.6.0
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling nom v5.1.1
[INFO] [stderr]     Checking log v0.4.8
[INFO] [stderr]    Compiling lexical-core v0.6.7
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking itertools v0.8.2
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking regex-automata v0.1.8
[INFO] [stderr]     Checking criterion-plot v0.4.1
[INFO] [stderr]     Checking crossbeam-queue v0.2.1
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]     Checking num_cpus v1.12.0
[INFO] [stderr]     Checking isatty v0.1.9
[INFO] [stderr]     Checking term_size v0.3.1
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking plotters v0.2.12
[INFO] [stderr]     Checking rayon-core v1.7.0
[INFO] [stderr]     Checking rayon v1.3.0
[INFO] [stderr]     Checking bstr v0.2.11
[INFO] [stderr]     Checking serde_json v1.0.48
[INFO] [stderr]     Checking rustyline v6.0.0
[INFO] [stderr]     Checking csv v1.1.3
[INFO] [stderr]     Checking tinytemplate v1.0.3
[INFO] [stderr]     Checking rust_black_tree v0.1.5 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]     Checking criterion v0.3.1
[INFO] [stdout] warning: unused import: `std::iter`
[INFO] [stdout]  --> benches/my_benchmark.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::iter;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Throughput`
[INFO] [stdout]  --> benches/my_benchmark.rs:3:74
[INFO] [stdout]   |
[INFO] [stdout] 3 | use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion, Throughput};
[INFO] [stdout]   |                                                                          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 08s
[INFO] running `Command { std: "docker" "inspect" "795a432063803340938374ab8bd8ee2c332529b43f15212f990dfdbe51261a8d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "795a432063803340938374ab8bd8ee2c332529b43f15212f990dfdbe51261a8d", kill_on_drop: false }`
[INFO] [stdout] 795a432063803340938374ab8bd8ee2c332529b43f15212f990dfdbe51261a8d