[INFO] cloning repository https://github.com/Ioka-Technologies/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Ioka-Technologies/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIoka-Technologies%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIoka-Technologies%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 558e2e16fd23591ad1dc16784ee65ebcfeb36a75
[INFO] checking Ioka-Technologies/rust-playground against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIoka-Technologies%2Frust-playground" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Ioka-Technologies/rust-playground 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/Ioka-Technologies/rust-playground
[INFO] removed 0 missing tests
[INFO] finished tweaking git repo https://github.com/Ioka-Technologies/rust-playground
[INFO] tweaked toml for git repo https://github.com/Ioka-Technologies/rust-playground written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Ioka-Technologies/rust-playground 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 }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] f5f54675122d5e910ef2ee37a134ca8673305e9d7213d631194daa330f02d2e6
[INFO] running `Command { std: "docker" "start" "-a" "f5f54675122d5e910ef2ee37a134ca8673305e9d7213d631194daa330f02d2e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f5f54675122d5e910ef2ee37a134ca8673305e9d7213d631194daa330f02d2e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f5f54675122d5e910ef2ee37a134ca8673305e9d7213d631194daa330f02d2e6", kill_on_drop: false }`
[INFO] [stdout] f5f54675122d5e910ef2ee37a134ca8673305e9d7213d631194daa330f02d2e6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 9027e4bdde729b382d5f33fd3e77bf7098eea30c25a541abd2bd1d3da9858779
[INFO] running `Command { std: "docker" "start" "-a" "9027e4bdde729b382d5f33fd3e77bf7098eea30c25a541abd2bd1d3da9858779", kill_on_drop: false }`
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[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/lessons/threads.rs:2:23
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::sync::mpsc::{self, Receiver};
[INFO] [stdout]   |                       ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Work` is never constructed
[INFO] [stdout]   --> src/lessons/threads.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Work {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `process` are never used
[INFO] [stdout]   --> src/lessons/threads.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Work {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 17 |     fn new() -> Work {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 25 |     pub fn process(&mut self) {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `process_jobs` is never used
[INFO] [stdout]   --> src/lessons/threads.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn process_jobs(recv_channel: Receiver<&mut Work>) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `simple_thread` is never used
[INFO] [stdout]   --> src/lessons/threads.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn simple_thread() -> thread::JoinHandle<Vec<i32>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mutex_and_atomic_ref_counts` is never used
[INFO] [stdout]   --> src/lessons/threads.rs:52:4
[INFO] [stdout]    |
[INFO] [stdout] 52 | fn mutex_and_atomic_ref_counts(num_increments: usize) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `LogLevel` is never used
[INFO] [stdout]  --> src/lessons/traits.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum LogLevel {
[INFO] [stdout]   |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LoggingService` is never constructed
[INFO] [stdout]   --> src/lessons/traits.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | struct LoggingService {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `set_level`, `add_logger`, and `log` are never used
[INFO] [stdout]   --> src/lessons/traits.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl LoggingService {
[INFO] [stdout]    | ------------------- associated items in this implementation
[INFO] [stdout] 21 |     fn new(level: LogLevel) -> LoggingService {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 28 |     fn set_level(&'_ mut self, level: LogLevel) -> &'_ mut Self {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     fn add_logger(&'_ mut self, logger: Rc<dyn Logger>) -> &'_ mut Self {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 38 |     fn log(&self, level: LogLevel, message: &str) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TestLogger` is never constructed
[INFO] [stdout]   --> src/lessons/traits.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | struct TestLogger {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/lessons/traits.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 51 | impl TestLogger {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 52 |     fn new() -> TestLogger {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stderr]    Compiling gherkin v0.14.0
[INFO] [stderr]     Checking cucumber v0.20.2
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 38.49s
[INFO] running `Command { std: "docker" "inspect" "9027e4bdde729b382d5f33fd3e77bf7098eea30c25a541abd2bd1d3da9858779", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9027e4bdde729b382d5f33fd3e77bf7098eea30c25a541abd2bd1d3da9858779", kill_on_drop: false }`
[INFO] [stdout] 9027e4bdde729b382d5f33fd3e77bf7098eea30c25a541abd2bd1d3da9858779