[INFO] cloning repository https://github.com/mtelahun/Rust_Atomics_and_Locks_by_Mara_Bos
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mtelahun/Rust_Atomics_and_Locks_by_Mara_Bos" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmtelahun%2FRust_Atomics_and_Locks_by_Mara_Bos", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmtelahun%2FRust_Atomics_and_Locks_by_Mara_Bos'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 48457f3ccabaee7c1ccd038f44c9b358d9ffc972
[INFO] checking mtelahun/Rust_Atomics_and_Locks_by_Mara_Bos against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmtelahun%2FRust_Atomics_and_Locks_by_Mara_Bos" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mtelahun/Rust_Atomics_and_Locks_by_Mara_Bos on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mtelahun/Rust_Atomics_and_Locks_by_Mara_Bos
[INFO] finished tweaking git repo https://github.com/mtelahun/Rust_Atomics_and_Locks_by_Mara_Bos
[INFO] tweaked toml for git repo https://github.com/mtelahun/Rust_Atomics_and_Locks_by_Mara_Bos written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/mtelahun/Rust_Atomics_and_Locks_by_Mara_Bos 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded event-listener v4.0.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0b662593110faa91c75ac0172c00604a4cb434a3dc848dcaee8bc5779844c7e9
[INFO] running `Command { std: "docker" "start" "-a" "0b662593110faa91c75ac0172c00604a4cb434a3dc848dcaee8bc5779844c7e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0b662593110faa91c75ac0172c00604a4cb434a3dc848dcaee8bc5779844c7e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b662593110faa91c75ac0172c00604a4cb434a3dc848dcaee8bc5779844c7e9", kill_on_drop: false }`
[INFO] [stdout] 0b662593110faa91c75ac0172c00604a4cb434a3dc848dcaee8bc5779844c7e9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 939e0229b8e00465e21b6387383b317b2cc90932022f84344a5b3556b62ce5f5
[INFO] running `Command { std: "docker" "start" "-a" "939e0229b8e00465e21b6387383b317b2cc90932022f84344a5b3556b62ce5f5", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.18
[INFO] [stderr]     Checking parking v2.2.0
[INFO] [stderr]     Checking futures-io v0.3.30
[INFO] [stderr]    Compiling libc v0.2.151
[INFO] [stderr]     Checking fastrand v2.0.1
[INFO] [stderr]    Compiling rustix v0.38.28
[INFO] [stderr]     Checking tracing-core v0.1.32
[INFO] [stderr]    Compiling proc-macro2 v1.0.71
[INFO] [stderr]     Checking bitflags v2.4.1
[INFO] [stderr]    Compiling io-lifetimes v1.0.11
[INFO] [stderr]     Checking value-bag v1.4.2
[INFO] [stderr]     Checking futures-lite v2.1.0
[INFO] [stderr]     Checking linux-raw-sys v0.4.12
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]     Checking tracing v0.1.40
[INFO] [stderr]    Compiling polling v2.8.0
[INFO] [stderr]    Compiling rustix v0.37.27
[INFO] [stderr]     Checking async-task v4.6.0
[INFO] [stderr]     Checking event-listener v2.5.3
[INFO] [stderr]     Checking atomic-waker v1.1.2
[INFO] [stderr]     Checking piper v0.2.1
[INFO] [stderr]    Compiling async-io v1.13.0
[INFO] [stderr]     Checking waker-fn v1.1.1
[INFO] [stderr]     Checking fastrand v1.9.0
[INFO] [stderr]     Checking concurrent-queue v2.4.0
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]     Checking linux-raw-sys v0.3.8
[INFO] [stderr]     Checking futures-lite v1.13.0
[INFO] [stderr]     Checking event-listener v4.0.1
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking socket2 v0.4.10
[INFO] [stderr]     Checking async-lock v2.8.0
[INFO] [stderr]     Checking event-listener-strategy v0.4.0
[INFO] [stderr]     Checking async-channel v1.9.0
[INFO] [stderr]     Checking async-lock v3.2.0
[INFO] [stderr]     Checking async-channel v2.1.1
[INFO] [stderr]     Checking kv-log-macro v1.0.7
[INFO] [stderr]     Checking ch06_arc v0.1.0 (/opt/rustwide/workdir/ch06_arc)
[INFO] [stderr]     Checking ch05_unsafe_oneshot_channel v0.1.0 (/opt/rustwide/workdir/ch05_unsafe_oneshot_channel)
[INFO] [stderr]     Checking atomics-01-thread v0.1.0 (/opt/rustwide/workdir/01_thread)
[INFO] [stderr]     Checking ch01_scoped_thread v0.1.0 (/opt/rustwide/workdir/ch01_scoped_thread)
[INFO] [stderr]     Checking ch02_progress v0.1.0 (/opt/rustwide/workdir/ch02_progress)
[INFO] [stderr]     Checking ch03_mutex v0.1.0 (/opt/rustwide/workdir/ch03_mutex)
[INFO] [stderr]     Checking ch01_rc_arc v0.1.0 (/opt/rustwide/workdir/ch01_rc_arc)
[INFO] [stdout] warning: the item `AtomicUsize` is imported redundantly
[INFO] [stdout]    --> ch06_arc/src/arc.rs:178:29
[INFO] [stdout]     |
[INFO] [stdout] 177 |     use super::*;
[INFO] [stdout]     |         -------- the item `AtomicUsize` is already imported here
[INFO] [stdout] 178 |     use std::sync::atomic::{AtomicUsize, Ordering};
[INFO] [stdout]     |                             ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Ordering` is imported redundantly
[INFO] [stdout]    --> ch06_arc/src/arc.rs:178:42
[INFO] [stdout]     |
[INFO] [stdout] 177 |     use super::*;
[INFO] [stdout]     |         -------- the item `Ordering` is already imported here
[INFO] [stdout] 178 |     use std::sync::atomic::{AtomicUsize, Ordering};
[INFO] [stdout]     |                                          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch04_spinlock v0.1.0 (/opt/rustwide/workdir/ch04_spinlock)
[INFO] [stderr]     Checking ch03_release_acquire_ordering v0.1.0 (/opt/rustwide/workdir/ch03_release_acquire_ordering)
[INFO] [stderr]     Checking ch03_out_of_thin_air_values v0.1.0 (/opt/rustwide/workdir/ch03_out_of_thin_air_values)
[INFO] [stderr]     Checking async-executor v1.8.0
[INFO] [stderr]     Checking blocking v1.5.1
[INFO] [stderr]    Compiling async-attributes v1.1.2
[INFO] [stderr]     Checking polling v3.3.1
[INFO] [stderr]     Checking async-io v2.2.2
[INFO] [stderr]     Checking async-global-executor v2.4.1
[INFO] [stderr]     Checking async-std v1.12.0
[INFO] [stderr]     Checking ch05_simple_channel v0.1.0 (/opt/rustwide/workdir/ch05_simple_channel)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 20.93s
[INFO] running `Command { std: "docker" "inspect" "939e0229b8e00465e21b6387383b317b2cc90932022f84344a5b3556b62ce5f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "939e0229b8e00465e21b6387383b317b2cc90932022f84344a5b3556b62ce5f5", kill_on_drop: false }`
[INFO] [stdout] 939e0229b8e00465e21b6387383b317b2cc90932022f84344a5b3556b62ce5f5