[INFO] cloning repository https://github.com/mucks/concurrency_exercise
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mucks/concurrency_exercise" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmucks%2Fconcurrency_exercise", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmucks%2Fconcurrency_exercise'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ffe52c042f7b3612ddfa9342716729cbe81f4254
[INFO] checking mucks/concurrency_exercise against 1.95.0 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmucks%2Fconcurrency_exercise" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/mucks/concurrency_exercise
[INFO] finished tweaking git repo https://github.com/mucks/concurrency_exercise
[INFO] tweaked toml for git repo https://github.com/mucks/concurrency_exercise written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/mucks/concurrency_exercise on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/mucks/concurrency_exercise 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8067b325a5cea036d16e619f133aaa4f2a9a72cfe93d10c92364fbb853199fab
[INFO] running `Command { std: "docker" "start" "-a" "8067b325a5cea036d16e619f133aaa4f2a9a72cfe93d10c92364fbb853199fab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8067b325a5cea036d16e619f133aaa4f2a9a72cfe93d10c92364fbb853199fab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8067b325a5cea036d16e619f133aaa4f2a9a72cfe93d10c92364fbb853199fab", kill_on_drop: false }`
[INFO] [stdout] 8067b325a5cea036d16e619f133aaa4f2a9a72cfe93d10c92364fbb853199fab
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b632f8b3eda32806f5c1dcc07199e52f4ec036fb15d94da32ef36689bbeb29b3
[INFO] running `Command { std: "docker" "start" "-a" "b632f8b3eda32806f5c1dcc07199e52f4ec036fb15d94da32ef36689bbeb29b3", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.46
[INFO] [stderr]    Compiling libc v0.2.134
[INFO] [stderr]    Compiling unicode-ident v1.0.4
[INFO] [stderr]    Compiling syn v1.0.101
[INFO] [stderr]    Compiling futures-core v0.3.24
[INFO] [stderr]    Compiling futures-channel v0.3.24
[INFO] [stderr]    Compiling futures-task v0.3.24
[INFO] [stderr]    Compiling futures-util v0.3.24
[INFO] [stderr]     Checking futures-sink v0.3.24
[INFO] [stderr]    Compiling slab v0.4.7
[INFO] [stderr]     Checking futures-io v0.3.24
[INFO] [stderr]    Compiling tokio v1.21.2
[INFO] [stderr]    Compiling thiserror v1.0.37
[INFO] [stderr]    Compiling async-trait v0.1.57
[INFO] [stderr]     Checking getrandom v0.2.7
[INFO] [stderr]     Checking parking_lot_core v0.9.3
[INFO] [stderr]     Checking mio v0.8.4
[INFO] [stderr]     Checking signal-hook-registry v1.4.0
[INFO] [stderr]     Checking socket2 v0.4.7
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]    Compiling futures-macro v0.3.24
[INFO] [stderr]    Compiling tokio-macros v1.8.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.37
[INFO] [stderr]    Compiling derive_more v0.99.17
[INFO] [stderr]     Checking futures-executor v0.3.24
[INFO] [stderr]     Checking futures v0.3.24
[INFO] [stderr]     Checking concurrency-exercise-01 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `repositories`
[INFO] [stdout]   --> src/solution.rs:13:20
[INFO] [stdout]    |
[INFO] [stdout] 13 |     async fn solve(repositories: Vec<ServerName>) -> Option<Binary> {
[INFO] [stdout]    |                    ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_repositories`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ServerError` is never used
[INFO] [stdout]  --> src/statement.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub enum ServerError {
[INFO] [stdout]   |          ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `download` is never used
[INFO] [stdout]   --> src/statement.rs:21:14
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub async fn download(server_name: ServerName) -> Result<Binary, ServerError> {
[INFO] [stdout]    |              ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `repositories`
[INFO] [stdout]   --> src/solution.rs:13:20
[INFO] [stdout]    |
[INFO] [stdout] 13 |     async fn solve(repositories: Vec<ServerName>) -> Option<Binary> {
[INFO] [stdout]    |                    ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_repositories`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ServerError` is never used
[INFO] [stdout]  --> src/statement.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub enum ServerError {
[INFO] [stdout]   |          ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `download` is never used
[INFO] [stdout]   --> src/statement.rs:21:14
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub async fn download(server_name: ServerName) -> Result<Binary, ServerError> {
[INFO] [stdout]    |              ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 14.83s
[INFO] running `Command { std: "docker" "inspect" "b632f8b3eda32806f5c1dcc07199e52f4ec036fb15d94da32ef36689bbeb29b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b632f8b3eda32806f5c1dcc07199e52f4ec036fb15d94da32ef36689bbeb29b3", kill_on_drop: false }`
[INFO] [stdout] b632f8b3eda32806f5c1dcc07199e52f4ec036fb15d94da32ef36689bbeb29b3
