[INFO] fetching crate matchbox_signaling 0.8.0...
[INFO] checking matchbox_signaling-0.8.0 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate matchbox_signaling 0.8.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate matchbox_signaling 0.8.0 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 matchbox_signaling 0.8.0
[INFO] finished tweaking crates.io crate matchbox_signaling 0.8.0
[INFO] tweaked toml for crates.io crate matchbox_signaling 0.8.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate crates.io crate matchbox_signaling 0.8.0 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 matchbox_protocol v0.8.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 51ef4354837d17ac677d98c0be8815e06a9fb2dbd84296718755efa6307077f4
[INFO] running `Command { std: "docker" "start" "-a" "51ef4354837d17ac677d98c0be8815e06a9fb2dbd84296718755efa6307077f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "51ef4354837d17ac677d98c0be8815e06a9fb2dbd84296718755efa6307077f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "51ef4354837d17ac677d98c0be8815e06a9fb2dbd84296718755efa6307077f4", kill_on_drop: false }`
[INFO] [stdout] 51ef4354837d17ac677d98c0be8815e06a9fb2dbd84296718755efa6307077f4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 0f8fc83df052fac4861be9eb27109df9f86795c96c13f626fb5dd777ce5052c3
[INFO] running `Command { std: "docker" "start" "-a" "0f8fc83df052fac4861be9eb27109df9f86795c96c13f626fb5dd777ce5052c3", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.150
[INFO] [stderr]     Checking futures-sink v0.3.29
[INFO] [stderr]    Compiling futures-util v0.3.29
[INFO] [stderr]    Compiling serde v1.0.192
[INFO] [stderr]    Compiling rustversion v1.0.14
[INFO] [stderr]     Checking http v0.2.11
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[INFO] [stderr]     Checking regex v1.10.2
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[INFO] [stderr]    Compiling thiserror-impl v1.0.50
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[INFO] [stderr]     Checking uuid v1.5.0
[INFO] [stderr]     Checking matchbox_protocol v0.8.0
[INFO] [stderr]     Checking matchbox_signaling v0.8.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `server::SignalingServer`
[INFO] [stdout]  --> src/signaling_server/mod.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub use server::SignalingServer;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `server::SignalingServer`
[INFO] [stdout]  --> src/signaling_server/mod.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub use server::SignalingServer;
[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` profile [unoptimized + debuginfo] target(s) in 10.32s
[INFO] running `Command { std: "docker" "inspect" "0f8fc83df052fac4861be9eb27109df9f86795c96c13f626fb5dd777ce5052c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f8fc83df052fac4861be9eb27109df9f86795c96c13f626fb5dd777ce5052c3", kill_on_drop: false }`
[INFO] [stdout] 0f8fc83df052fac4861be9eb27109df9f86795c96c13f626fb5dd777ce5052c3