[INFO] cloning repository https://github.com/yaahc/async-practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yaahc/async-practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyaahc%2Fasync-practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyaahc%2Fasync-practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 160f1be83ab7d02173c13c36f2a138594781679c
[INFO] checking yaahc/async-practice against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyaahc%2Fasync-practice" "/workspace/builds/worker-15/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-15/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/yaahc/async-practice on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-15/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/yaahc/async-practice
[INFO] finished tweaking git repo https://github.com/yaahc/async-practice
[INFO] tweaked toml for git repo https://github.com/yaahc/async-practice written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] crate git repo https://github.com/yaahc/async-practice already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cbd36f77e2a403964a3fc4ec444727d470c104c7f82e3ef584e89a32c0e9fbb6
[INFO] running `Command { std: "docker" "start" "-a" "cbd36f77e2a403964a3fc4ec444727d470c104c7f82e3ef584e89a32c0e9fbb6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cbd36f77e2a403964a3fc4ec444727d470c104c7f82e3ef584e89a32c0e9fbb6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cbd36f77e2a403964a3fc4ec444727d470c104c7f82e3ef584e89a32c0e9fbb6", kill_on_drop: false }`
[INFO] [stdout] cbd36f77e2a403964a3fc4ec444727d470c104c7f82e3ef584e89a32c0e9fbb6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 26ac96e12803a2041d48acea11b18eb0baf92871270acc1276251be6b1064fa5
[INFO] running `Command { std: "docker" "start" "-a" "26ac96e12803a2041d48acea11b18eb0baf92871270acc1276251be6b1064fa5", kill_on_drop: false }`
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[INFO] [stderr]    Compiling libc v0.2.62
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[INFO] [stderr]     Checking tokio-timer v0.3.0-alpha.4
[INFO] [stderr]     Checking tokio-fs v0.2.0-alpha.4
[INFO] [stderr]     Checking tokio-net v0.2.0-alpha.4
[INFO] [stderr]     Checking tokio v0.2.0-alpha.4
[INFO] [stderr]     Checking tracing-futures v0.0.1-alpha.2 (https://github.com/tokio-rs/tracing?rev=9f1126a00d105ff85f5b65fc6457699430b1bed4#9f1126a0)
[INFO] [stderr]     Checking chat v0.1.0 (/opt/rustwide/workdir/chat)
[INFO] [stdout] warning: unused import: `trace_span`
[INFO] [stdout]  --> chat/src/server.rs:9:28
[INFO] [stdout]   |
[INFO] [stdout] 9 | use tracing::{debug, info, trace_span, warn};
[INFO] [stdout]   |                            ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tracing_futures::Instrument`
[INFO] [stdout]   --> chat/src/server.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use tracing_futures::Instrument;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `trace_span`
[INFO] [stdout]  --> chat/src/server.rs:9:28
[INFO] [stdout]   |
[INFO] [stdout] 9 | use tracing::{debug, info, trace_span, warn};
[INFO] [stdout]   |                            ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tracing_futures::Instrument`
[INFO] [stdout]   --> chat/src/server.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use tracing_futures::Instrument;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TryStream`
[INFO] [stdout]  --> chat/src/bin/client.rs:3:49
[INFO] [stdout]   |
[INFO] [stdout] 3 | use futures::{Sink, SinkExt, Stream, StreamExt, TryStream, TryStreamExt};
[INFO] [stdout]   |                                                 ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TryStream`
[INFO] [stdout]  --> chat/src/bin/client.rs:3:49
[INFO] [stdout]   |
[INFO] [stdout] 3 | use futures::{Sink, SinkExt, Stream, StreamExt, TryStream, TryStreamExt};
[INFO] [stdout]   |                                                 ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` 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]     Finished dev [unoptimized + debuginfo] target(s) in 27.89s
[INFO] running `Command { std: "docker" "inspect" "26ac96e12803a2041d48acea11b18eb0baf92871270acc1276251be6b1064fa5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26ac96e12803a2041d48acea11b18eb0baf92871270acc1276251be6b1064fa5", kill_on_drop: false }`
[INFO] [stdout] 26ac96e12803a2041d48acea11b18eb0baf92871270acc1276251be6b1064fa5