[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] ae8c3c79a482e9fcbfe5d159ff018774486bcd5a
[INFO] checking haiaty/neverstoplearning-rust against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhaiaty%2Fneverstoplearning-rust" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/haiaty/neverstoplearning-rust on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "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-6/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" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fcfe023674691f39cf067182e86520271130d66ccd88c99d4186ed55cd067bd4
[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" "fcfe023674691f39cf067182e86520271130d66ccd88c99d4186ed55cd067bd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fcfe023674691f39cf067182e86520271130d66ccd88c99d4186ed55cd067bd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fcfe023674691f39cf067182e86520271130d66ccd88c99d4186ed55cd067bd4", kill_on_drop: false }`
[INFO] [stdout] fcfe023674691f39cf067182e86520271130d66ccd88c99d4186ed55cd067bd4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 20b2bf754917c2c8e45987fc49805a5b20730803197a23f9c96acd5f25285a89
[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" "20b2bf754917c2c8e45987fc49805a5b20730803197a23f9c96acd5f25285a89", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.34
[INFO] [stderr]     Checking futures-core v0.3.5
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]     Checking futures-io v0.3.5
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]     Checking arrayvec v0.5.1
[INFO] [stderr]     Checking parking v1.0.4
[INFO] [stderr]     Checking fastrand v1.3.3
[INFO] [stderr]     Checking futures-timer v3.0.2
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]    Compiling openssl-sys v0.9.58
[INFO] [stderr]     Checking concurrent-queue v1.1.1
[INFO] [stderr]     Checking bitvec v0.17.4
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking signal-hook-registry v1.2.0
[INFO] [stderr]     Checking socket2 v0.3.12
[INFO] [stderr]     Checking parking_lot_core v0.8.0
[INFO] [stderr]     Checking tiny-keccak v2.0.2
[INFO] [stderr]     Checking futures-channel v0.3.5
[INFO] [stderr]     Checking parking_lot v0.11.0
[INFO] [stderr]     Checking fixed-hash v0.6.1
[INFO] [stderr]     Checking uint v0.8.3
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr]    Compiling openssl v0.10.30
[INFO] [stderr]    Compiling native-tls v0.2.4
[INFO] [stderr]    Compiling pin-project-internal v0.4.22
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling thiserror-impl v1.0.20
[INFO] [stderr]    Compiling derive_more v0.99.9
[INFO] [stderr]     Checking tokio v0.2.21
[INFO] [stderr]     Checking thiserror v1.0.20
[INFO] [stderr]     Checking pin-project v0.4.22
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking tokio-util v0.3.1
[INFO] [stderr]     Checking tokio-tls v0.3.1
[INFO] [stderr]     Checking blocking v0.4.6
[INFO] [stderr]     Checking futures-executor v0.3.5
[INFO] [stderr]     Checking h2 v0.2.5
[INFO] [stderr]     Checking futures v0.3.5
[INFO] [stderr]     Checking smol v0.1.18
[INFO] [stderr]     Checking soketto v0.4.1
[INFO] [stderr]     Checking async-std v1.6.2
[INFO] [stderr]     Checking hyper v0.13.6
[INFO] [stderr]     Checking impl-serde v0.3.1
[INFO] [stderr]     Checking parity-scale-codec v1.3.1
[INFO] [stderr]     Checking serde_json v1.0.56
[INFO] [stderr]     Checking ethbloom v0.9.2
[INFO] [stderr]     Checking jsonrpc-core v14.2.0
[INFO] [stderr]     Checking async-native-tls v0.3.3
[INFO] [stderr]     Checking hyper-tls v0.4.3
[INFO] [stderr]     Checking impl-codec v0.4.2
[INFO] [stderr]     Checking primitive-types v0.7.2
[INFO] [stderr]     Checking ethereum-types v0.9.2
[INFO] [stderr]     Checking ethabi v12.0.0
[INFO] [stderr]     Checking web3 v0.13.0 (https://github.com/tomusdrw/rust-web3#f8ed7137)
[INFO] [stderr]     Checking learning_rust v0.1.0 (/opt/rustwide/workdir)
[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: 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 `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] [stdout] warning: unused `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 1m 50s
[INFO] running `Command { std: "docker" "inspect" "20b2bf754917c2c8e45987fc49805a5b20730803197a23f9c96acd5f25285a89", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20b2bf754917c2c8e45987fc49805a5b20730803197a23f9c96acd5f25285a89", kill_on_drop: false }`
[INFO] [stdout] 20b2bf754917c2c8e45987fc49805a5b20730803197a23f9c96acd5f25285a89