[INFO] cloning repository https://github.com/CheatCod/learning-session
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CheatCod/learning-session" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCheatCod%2Flearning-session", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCheatCod%2Flearning-session'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6785650df03fc07d39fae2d2577d995ba34633fb
[INFO] building CheatCod/learning-session against master#ad211ced81509462cdfe4c29ed10f97279a0acae for pr-135216
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCheatCod%2Flearning-session" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/CheatCod/learning-session on toolchain ad211ced81509462cdfe4c29ed10f97279a0acae
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/CheatCod/learning-session
[INFO] finished tweaking git repo https://github.com/CheatCod/learning-session
[INFO] tweaked toml for git repo https://github.com/CheatCod/learning-session written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/CheatCod/learning-session 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" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tokio v1.41.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 492bfc7e927db74494d4d55b11e73703ab7b57b224df1a834c1fe5e4d224d012
[INFO] running `Command { std: "docker" "start" "-a" "492bfc7e927db74494d4d55b11e73703ab7b57b224df1a834c1fe5e4d224d012", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "492bfc7e927db74494d4d55b11e73703ab7b57b224df1a834c1fe5e4d224d012", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "492bfc7e927db74494d4d55b11e73703ab7b57b224df1a834c1fe5e4d224d012", kill_on_drop: false }`
[INFO] [stdout] 492bfc7e927db74494d4d55b11e73703ab7b57b224df1a834c1fe5e4d224d012
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9a7f1d78a6c1ba6bb1d2f8529cd9eeb6b3f1a6f6684236839b582e805af2c983
[INFO] running `Command { std: "docker" "start" "-a" "9a7f1d78a6c1ba6bb1d2f8529cd9eeb6b3f1a6f6684236839b582e805af2c983", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.161
[INFO] [stderr]    Compiling proc-macro2 v1.0.89
[INFO] [stderr]    Compiling unicode-ident v1.0.13
[INFO] [stderr]    Compiling parking_lot_core v0.9.10
[INFO] [stderr]    Compiling scopeguard v1.2.0
[INFO] [stderr]    Compiling smallvec v1.13.2
[INFO] [stderr]    Compiling lock_api v0.4.12
[INFO] [stderr]    Compiling bytes v1.8.0
[INFO] [stderr]    Compiling pin-project-lite v0.2.15
[INFO] [stderr]    Compiling mio v1.0.2
[INFO] [stderr]    Compiling signal-hook-registry v1.4.2
[INFO] [stderr]    Compiling socket2 v0.5.7
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling parking_lot v0.12.3
[INFO] [stderr]    Compiling syn v2.0.85
[INFO] [stderr]    Compiling tokio-macros v2.4.0
[INFO] [stderr]    Compiling tokio v1.41.0
[INFO] [stderr]    Compiling learning-session v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 21.77s
[INFO] running `Command { std: "docker" "inspect" "9a7f1d78a6c1ba6bb1d2f8529cd9eeb6b3f1a6f6684236839b582e805af2c983", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a7f1d78a6c1ba6bb1d2f8529cd9eeb6b3f1a6f6684236839b582e805af2c983", kill_on_drop: false }`
[INFO] [stdout] 9a7f1d78a6c1ba6bb1d2f8529cd9eeb6b3f1a6f6684236839b582e805af2c983
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ebd490562e8cf43ed7168227ddd97de7c2e556da28541759c4221f0ca40f6017
[INFO] running `Command { std: "docker" "start" "-a" "ebd490562e8cf43ed7168227ddd97de7c2e556da28541759c4221f0ca40f6017", kill_on_drop: false }`
[INFO] [stderr]    Compiling learning-session v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/intro_to_multi_threading/lesson.rs:150:13
[INFO] [stdout]     |
[INFO] [stdout] 150 |         let mut counter = Arc::new(Mutex::new(0));
[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: unused implementer of `Future` that must be used
[INFO] [stdout]    --> src/intro_to_async/lesson.rs:121:9
[INFO] [stdout]     |
[INFO] [stdout] 121 |         async_fn(0);
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.79s
[INFO] running `Command { std: "docker" "inspect" "ebd490562e8cf43ed7168227ddd97de7c2e556da28541759c4221f0ca40f6017", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ebd490562e8cf43ed7168227ddd97de7c2e556da28541759c4221f0ca40f6017", kill_on_drop: false }`
[INFO] [stdout] ebd490562e8cf43ed7168227ddd97de7c2e556da28541759c4221f0ca40f6017
