[INFO] fetching crate cadence 1.0.0...
[INFO] checking cadence-1.0.0 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate cadence 1.0.0 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate cadence 1.0.0 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cadence 1.0.0
[INFO] finished tweaking crates.io crate cadence 1.0.0
[INFO] tweaked toml for crates.io crate cadence 1.0.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate crates.io crate cadence 1.0.0 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 15bf3c147d0e8168023b73ec603eb24fb2a5138eaf6d401a159029d20e76e4f9
[INFO] running `Command { std: "docker" "start" "-a" "15bf3c147d0e8168023b73ec603eb24fb2a5138eaf6d401a159029d20e76e4f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "15bf3c147d0e8168023b73ec603eb24fb2a5138eaf6d401a159029d20e76e4f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15bf3c147d0e8168023b73ec603eb24fb2a5138eaf6d401a159029d20e76e4f9", kill_on_drop: false }`
[INFO] [stdout] 15bf3c147d0e8168023b73ec603eb24fb2a5138eaf6d401a159029d20e76e4f9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3e94419d5a498b4b9dca39d28d3a99b78bc4b01aa643ed90f7fc73639b8776af
[INFO] running `Command { std: "docker" "start" "-a" "3e94419d5a498b4b9dca39d28d3a99b78bc4b01aa643ed90f7fc73639b8776af", kill_on_drop: false }`
[INFO] [stderr]     Checking cadence v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `crossbeam_channel` is imported redundantly
[INFO] [stdout]   --> src/sinks/queuing.rs:12:25
[INFO] [stdout]    |
[INFO] [stdout] 12 | use crossbeam_channel::{self, Receiver, Sender, TrySendError};
[INFO] [stdout]    |                         ^^^^ the item `crossbeam_channel` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `crossbeam_channel` is imported redundantly
[INFO] [stdout]   --> src/sinks/queuing.rs:12:25
[INFO] [stdout]    |
[INFO] [stdout] 12 | use crossbeam_channel::{self, Receiver, Sender, TrySendError};
[INFO] [stdout]    |                         ^^^^ the item `crossbeam_channel` is already defined by prelude
[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` profile [unoptimized + debuginfo] target(s) in 0.40s
[INFO] running `Command { std: "docker" "inspect" "3e94419d5a498b4b9dca39d28d3a99b78bc4b01aa643ed90f7fc73639b8776af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3e94419d5a498b4b9dca39d28d3a99b78bc4b01aa643ed90f7fc73639b8776af", kill_on_drop: false }`
[INFO] [stdout] 3e94419d5a498b4b9dca39d28d3a99b78bc4b01aa643ed90f7fc73639b8776af