[INFO] fetching crate build-target 0.4.0...
[INFO] checking build-target-0.4.0 against master#af4a5a13a15fa0c60e06321077ef452f769b42fd for pr-122960-2
[INFO] extracting crate build-target 0.4.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate build-target 0.4.0 on toolchain af4a5a13a15fa0c60e06321077ef452f769b42fd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate build-target 0.4.0
[INFO] finished tweaking crates.io crate build-target 0.4.0
[INFO] tweaked toml for crates.io crate build-target 0.4.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "fetch" "--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-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 471fa4828de6381262069c1e3bec8d01543af08abd2a7e0271ab7ae6e5d4f354
[INFO] running `Command { std: "docker" "start" "-a" "471fa4828de6381262069c1e3bec8d01543af08abd2a7e0271ab7ae6e5d4f354", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "471fa4828de6381262069c1e3bec8d01543af08abd2a7e0271ab7ae6e5d4f354", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "471fa4828de6381262069c1e3bec8d01543af08abd2a7e0271ab7ae6e5d4f354", kill_on_drop: false }`
[INFO] [stdout] 471fa4828de6381262069c1e3bec8d01543af08abd2a7e0271ab7ae6e5d4f354
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 87ca7d7cb09814bcee8c78ec668aba562dae843babd23635e3c247ebec4631d5
[INFO] running `Command { std: "docker" "start" "-a" "87ca7d7cb09814bcee8c78ec668aba562dae843babd23635e3c247ebec4631d5", kill_on_drop: false }`
[INFO] [stderr]     Checking build-target v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Cow` is imported redundantly
[INFO] [stdout]   --> src/utils.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     use super::*;
[INFO] [stdout]    |         -------- the item `Cow` is already imported here
[INFO] [stdout] 35 |     use std::borrow::Cow;
[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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.49s
[INFO] running `Command { std: "docker" "inspect" "87ca7d7cb09814bcee8c78ec668aba562dae843babd23635e3c247ebec4631d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87ca7d7cb09814bcee8c78ec668aba562dae843babd23635e3c247ebec4631d5", kill_on_drop: false }`
[INFO] [stdout] 87ca7d7cb09814bcee8c78ec668aba562dae843babd23635e3c247ebec4631d5