[INFO] fetching crate graphviz_dot_builder 0.1.3...
[INFO] checking graphviz_dot_builder-0.1.3 against master#38352b01ae4af9300be03b805d6db68c45e51068 for pr-129864
[INFO] extracting crate graphviz_dot_builder 0.1.3 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate graphviz_dot_builder 0.1.3 on toolchain 38352b01ae4af9300be03b805d6db68c45e51068
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate graphviz_dot_builder 0.1.3
[INFO] finished tweaking crates.io crate graphviz_dot_builder 0.1.3
[INFO] tweaked toml for crates.io crate graphviz_dot_builder 0.1.3 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" "+38352b01ae4af9300be03b805d6db68c45e51068" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 8 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9b03689f414d69926cc5e7e6e9e1120e355eb012fc8f0b0693b97ef1beaf8b38
[INFO] running `Command { std: "docker" "start" "-a" "9b03689f414d69926cc5e7e6e9e1120e355eb012fc8f0b0693b97ef1beaf8b38", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9b03689f414d69926cc5e7e6e9e1120e355eb012fc8f0b0693b97ef1beaf8b38", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b03689f414d69926cc5e7e6e9e1120e355eb012fc8f0b0693b97ef1beaf8b38", kill_on_drop: false }`
[INFO] [stdout] 9b03689f414d69926cc5e7e6e9e1120e355eb012fc8f0b0693b97ef1beaf8b38
[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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d63da7431affbb237e13a725ff24fda11cdd654de15a1472cc483c87c5cea8cb
[INFO] running `Command { std: "docker" "start" "-a" "d63da7431affbb237e13a725ff24fda11cdd654de15a1472cc483c87c5cea8cb", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustversion v1.0.17
[INFO] [stderr]    Compiling heck v0.5.0
[INFO] [stderr]     Checking strum v0.26.3
[INFO] [stderr]    Compiling syn v2.0.77
[INFO] [stderr]    Compiling strum_macros v0.26.4
[INFO] [stderr]     Checking graphviz_dot_builder v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/graph/print.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |         dot_file.write(self.to_dot_string().as_bytes());
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let _ = dot_file.write(self.to_dot_string().as_bytes());
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/graph/print.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |         dot_file.write(self.to_dot_string().as_bytes());
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let _ = dot_file.write(self.to_dot_string().as_bytes());
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.31s
[INFO] running `Command { std: "docker" "inspect" "d63da7431affbb237e13a725ff24fda11cdd654de15a1472cc483c87c5cea8cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d63da7431affbb237e13a725ff24fda11cdd654de15a1472cc483c87c5cea8cb", kill_on_drop: false }`
[INFO] [stdout] d63da7431affbb237e13a725ff24fda11cdd654de15a1472cc483c87c5cea8cb