[INFO] cloning repository https://github.com/hawkw/async-workshop
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hawkw/async-workshop" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhawkw%2Fasync-workshop", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhawkw%2Fasync-workshop'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 135a3e6edc840940ac3ae697825fc1e7b2495524
[INFO] checking hawkw/async-workshop against master#3aedcf06b73fc36feeebca3d579e1d2a6c40acc5 for pr-65819
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhawkw%2Fasync-workshop" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
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[INFO] validating manifest of git repo https://github.com/hawkw/async-workshop on toolchain 3aedcf06b73fc36feeebca3d579e1d2a6c40acc5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-11/source/.cargo/config
[INFO] started tweaking git repo https://github.com/hawkw/async-workshop
[INFO] finished tweaking git repo https://github.com/hawkw/async-workshop
[INFO] tweaked toml for git repo https://github.com/hawkw/async-workshop written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/hawkw/async-workshop already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5883aa74197bd81137514f5806e6819c6bf4e5a7213c9bf291694eae5f352b5e
[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" "5883aa74197bd81137514f5806e6819c6bf4e5a7213c9bf291694eae5f352b5e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5883aa74197bd81137514f5806e6819c6bf4e5a7213c9bf291694eae5f352b5e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5883aa74197bd81137514f5806e6819c6bf4e5a7213c9bf291694eae5f352b5e", kill_on_drop: false }`
[INFO] [stdout] 5883aa74197bd81137514f5806e6819c6bf4e5a7213c9bf291694eae5f352b5e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a1aff75d9dda96c1661e33857a2abee5685fa8a5933518b78f20dd5e75210873
[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" "a1aff75d9dda96c1661e33857a2abee5685fa8a5933518b78f20dd5e75210873", kill_on_drop: false }`
[INFO] [stderr]     Checking slab v0.4.2
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[INFO] [stderr]    Compiling proc-macro-error v0.2.6
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[INFO] [stderr]     Checking tokio-io v0.2.0-alpha.5
[INFO] [stderr]     Checking tokio-codec v0.2.0-alpha.5
[INFO] [stderr]     Checking tokio-net v0.2.0-alpha.5
[INFO] [stderr]     Checking tokio-timer v0.3.0-alpha.5
[INFO] [stderr]     Checking tokio-fs v0.2.0-alpha.5
[INFO] [stderr]     Checking tokio v0.2.0-alpha.5
[INFO] [stderr]     Checking tracing-futures v0.0.1-alpha.2 (https://github.com/tokio-rs/tracing?rev=9f1126a00d105ff85f5b65fc6457699430b1bed4#9f1126a0)
[INFO] [stderr]     Checking client v0.0.0 (/opt/rustwide/workdir/client)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> client/src/../solutions/client.rs:10:39
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub async fn run_client(user: String, mut stream: TcpStream) -> Result<(), Error> {
[INFO] [stdout]    |                                       ----^^^^^^
[INFO] [stdout]    |                                       |
[INFO] [stdout]    |                                       help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> client/src/../solutions/client.rs:10:39
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub async fn run_client(user: String, mut stream: TcpStream) -> Result<(), Error> {
[INFO] [stdout]    |                                       ----^^^^^^
[INFO] [stdout]    |                                       |
[INFO] [stdout]    |                                       help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking server v0.0.0 (/opt/rustwide/workdir/server)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 06s
[INFO] running `Command { std: "docker" "inspect" "a1aff75d9dda96c1661e33857a2abee5685fa8a5933518b78f20dd5e75210873", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a1aff75d9dda96c1661e33857a2abee5685fa8a5933518b78f20dd5e75210873", kill_on_drop: false }`
[INFO] [stdout] a1aff75d9dda96c1661e33857a2abee5685fa8a5933518b78f20dd5e75210873