[INFO] fetching crate ssh-muxcontrol 0.1.0...
[INFO] checking ssh-muxcontrol-0.1.0 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate ssh-muxcontrol 0.1.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate ssh-muxcontrol 0.1.0 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 ssh-muxcontrol 0.1.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate ssh-muxcontrol 0.1.0
[INFO] tweaked toml for crates.io crate ssh-muxcontrol 0.1.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate crates.io crate ssh-muxcontrol 0.1.0 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] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tokio-macros v1.5.0
[INFO] [stderr]   Downloaded sendfd v0.4.0
[INFO] [stderr]   Downloaded tokio-pipe v0.2.1
[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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8d3145095dc9d321a91d4521a160117cc28ff8970ab73b5a6f2433b4b207d760
[INFO] running `Command { std: "docker" "start" "-a" "8d3145095dc9d321a91d4521a160117cc28ff8970ab73b5a6f2433b4b207d760", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8d3145095dc9d321a91d4521a160117cc28ff8970ab73b5a6f2433b4b207d760", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d3145095dc9d321a91d4521a160117cc28ff8970ab73b5a6f2433b4b207d760", kill_on_drop: false }`
[INFO] [stdout] 8d3145095dc9d321a91d4521a160117cc28ff8970ab73b5a6f2433b4b207d760
[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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] daa40325540e59785d965c34a954037d8a1772d573305d582f69ac8c37ee3db3
[INFO] running `Command { std: "docker" "start" "-a" "daa40325540e59785d965c34a954037d8a1772d573305d582f69ac8c37ee3db3", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.30
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling libc v0.2.104
[INFO] [stderr]    Compiling tokio v1.12.0
[INFO] [stderr]     Checking pin-project-lite v0.2.7
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking mio v0.7.14
[INFO] [stderr]    Compiling tokio-macros v1.5.0
[INFO] [stderr]     Checking sendfd v0.4.0
[INFO] [stderr]     Checking tokio-pipe v0.2.1
[INFO] [stderr]     Checking ssh-muxcontrol v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `ssh_pid` is never read
[INFO] [stdout]   --> src/commands/check_alive.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct MuxRespCheckAlive {
[INFO] [stdout]    |            ----------------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 30 |     ssh_pid: u32,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MuxRespCheckAlive` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `ssh_pid` is never read
[INFO] [stdout]   --> src/commands/check_alive.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct MuxRespCheckAlive {
[INFO] [stdout]    |            ----------------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 30 |     ssh_pid: u32,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MuxRespCheckAlive` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` 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 8.62s
[INFO] running `Command { std: "docker" "inspect" "daa40325540e59785d965c34a954037d8a1772d573305d582f69ac8c37ee3db3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "daa40325540e59785d965c34a954037d8a1772d573305d582f69ac8c37ee3db3", kill_on_drop: false }`
[INFO] [stdout] daa40325540e59785d965c34a954037d8a1772d573305d582f69ac8c37ee3db3