[INFO] cloning repository https://github.com/haiaty/neverstoplearning-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/haiaty/neverstoplearning-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhaiaty%2Fneverstoplearning-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhaiaty%2Fneverstoplearning-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1af0790b124a12b3073703986c25e8930d7be2b1
[INFO] checking haiaty/neverstoplearning-rust against master#5e3f1b148db5bfa27fee52464ae1f5d34c49d77b for pr-75502
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhaiaty%2Fneverstoplearning-rust" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/haiaty/neverstoplearning-rust on toolchain 5e3f1b148db5bfa27fee52464ae1f5d34c49d77b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/haiaty/neverstoplearning-rust
[INFO] finished tweaking git repo https://github.com/haiaty/neverstoplearning-rust
[INFO] tweaked toml for git repo https://github.com/haiaty/neverstoplearning-rust written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/haiaty/neverstoplearning-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "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-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 419df7557a0ded1c14b9a27ddd63ce6b7e088d7b2118c5afb2fd8fab5a9d181e
[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" "419df7557a0ded1c14b9a27ddd63ce6b7e088d7b2118c5afb2fd8fab5a9d181e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "419df7557a0ded1c14b9a27ddd63ce6b7e088d7b2118c5afb2fd8fab5a9d181e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "419df7557a0ded1c14b9a27ddd63ce6b7e088d7b2118c5afb2fd8fab5a9d181e", kill_on_drop: false }`
[INFO] [stdout] 419df7557a0ded1c14b9a27ddd63ce6b7e088d7b2118c5afb2fd8fab5a9d181e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e262ce718b26999ad961d667a7abfdad02eabe9a924496aabbe2f5b1a7e7a6fd
[INFO] running `Command { std: "docker" "start" "-a" "e262ce718b26999ad961d667a7abfdad02eabe9a924496aabbe2f5b1a7e7a6fd", kill_on_drop: false }`
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[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> src/async-await/async-await-base.rs:13:49
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let rand_millis = time::Duration::from_secs((n2));
[INFO] [stdout]    |                                                 ^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> src/async-await/async-await-base.rs:72:20
[INFO] [stdout]    |
[INFO] [stdout] 72 |     sing_song_sync((&song));
[INFO] [stdout]    |                    ^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `tokio::time::Delay` that must be used
[INFO] [stdout]   --> src/async-await/async-await-base.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     tokio::time::delay_for(rand_millis);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> src/async-await/async-await-base.rs:13:49
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let rand_millis = time::Duration::from_secs((n2));
[INFO] [stdout]    |                                                 ^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> src/async-await/async-await-base.rs:72:20
[INFO] [stdout]    |
[INFO] [stdout] 72 |     sing_song_sync((&song));
[INFO] [stdout]    |                    ^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `tokio::time::Delay` that must be used
[INFO] [stdout]   --> src/async-await/async-await-base.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     tokio::time::delay_for(rand_millis);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2m 52s
[INFO] running `Command { std: "docker" "inspect" "e262ce718b26999ad961d667a7abfdad02eabe9a924496aabbe2f5b1a7e7a6fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e262ce718b26999ad961d667a7abfdad02eabe9a924496aabbe2f5b1a7e7a6fd", kill_on_drop: false }`
[INFO] [stdout] e262ce718b26999ad961d667a7abfdad02eabe9a924496aabbe2f5b1a7e7a6fd