[INFO] fetching crate candid_server 0.3.0...
[INFO] checking candid_server-0.3.0 against master#e4106065bf1bb515935d5d024e8d9c86454e2b22 for pr-112160
[INFO] extracting crate candid_server 0.3.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate candid_server 0.3.0 on toolchain e4106065bf1bb515935d5d024e8d9c86454e2b22
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e4106065bf1bb515935d5d024e8d9c86454e2b22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate candid_server 0.3.0
[INFO] finished tweaking crates.io crate candid_server 0.3.0
[INFO] tweaked toml for crates.io crate candid_server 0.3.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e4106065bf1bb515935d5d024e8d9c86454e2b22" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e4106065bf1bb515935d5d024e8d9c86454e2b22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded try_from v0.2.2
[INFO] [stderr]   Downloaded bitflags v0.4.0
[INFO] [stderr]   Downloaded nix v0.5.1
[INFO] [stderr]   Downloaded rand v0.5.6
[INFO] [stderr]   Downloaded itertools v0.4.19
[INFO] [stderr]   Downloaded hex v0.2.0
[INFO] [stderr]   Downloaded socketcan v1.7.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+e4106065bf1bb515935d5d024e8d9c86454e2b22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6d99d1ee5eab47f0d1a3b7a81d7ace098184082d5c5c094572090330f31db77c
[INFO] running `Command { std: "docker" "start" "-a" "6d99d1ee5eab47f0d1a3b7a81d7ace098184082d5c5c094572090330f31db77c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6d99d1ee5eab47f0d1a3b7a81d7ace098184082d5c5c094572090330f31db77c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d99d1ee5eab47f0d1a3b7a81d7ace098184082d5c5c094572090330f31db77c", kill_on_drop: false }`
[INFO] [stdout] 6d99d1ee5eab47f0d1a3b7a81d7ace098184082d5c5c094572090330f31db77c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+e4106065bf1bb515935d5d024e8d9c86454e2b22" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 94d939a135b03ec3776a6d2499f0654fe2850a061a5bb1b3bc0c7090824f057f
[INFO] running `Command { std: "docker" "start" "-a" "94d939a135b03ec3776a6d2499f0654fe2850a061a5bb1b3bc0c7090824f057f", kill_on_drop: false }`
[INFO] [stderr]     Checking bitflags v0.4.0
[INFO] [stderr]     Checking hex v0.2.0
[INFO] [stderr]     Checking itertools v0.4.19
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking try_from v0.2.2
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking nix v0.5.1
[INFO] [stderr]     Checking socketcan v1.7.0
[INFO] [stderr]     Checking candid_server v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/can_reader.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |         &self.clients.lock().unwrap().push(channel);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 49 |         let _ = &self.clients.lock().unwrap().push(channel);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/can_reader.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |         &self.clients.lock().unwrap().push(channel);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 49 |         let _ = &self.clients.lock().unwrap().push(channel);
[INFO] [stdout]    |         +++++++
[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 1.00s
[INFO] running `Command { std: "docker" "inspect" "94d939a135b03ec3776a6d2499f0654fe2850a061a5bb1b3bc0c7090824f057f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94d939a135b03ec3776a6d2499f0654fe2850a061a5bb1b3bc0c7090824f057f", kill_on_drop: false }`
[INFO] [stdout] 94d939a135b03ec3776a6d2499f0654fe2850a061a5bb1b3bc0c7090824f057f