[INFO] cloning repository https://github.com/codexmicrosystems/neutron
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/codexmicrosystems/neutron" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcodexmicrosystems%2Fneutron", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcodexmicrosystems%2Fneutron'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d1f72a53ca6a0655bdbcd8e85a6b538c661c1325
[INFO] checking codexmicrosystems/neutron against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcodexmicrosystems%2Fneutron" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/codexmicrosystems/neutron 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 git repo https://github.com/codexmicrosystems/neutron
[INFO] finished tweaking git repo https://github.com/codexmicrosystems/neutron
[INFO] tweaked toml for git repo https://github.com/codexmicrosystems/neutron written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/codexmicrosystems/neutron 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 libudev v0.3.0
[INFO] [stderr]   Downloaded thiserror-impl v1.0.51
[INFO] [stderr]   Downloaded unescaper v0.1.3
[INFO] [stderr]   Downloaded thiserror v1.0.51
[INFO] [stderr]   Downloaded serialport v4.3.0
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ab83419c7b4fa9e56ee7e992e407bb67434d82b2b62782708dd394aef1b3c553
[INFO] running `Command { std: "docker" "start" "-a" "ab83419c7b4fa9e56ee7e992e407bb67434d82b2b62782708dd394aef1b3c553", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ab83419c7b4fa9e56ee7e992e407bb67434d82b2b62782708dd394aef1b3c553", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab83419c7b4fa9e56ee7e992e407bb67434d82b2b62782708dd394aef1b3c553", kill_on_drop: false }`
[INFO] [stdout] ab83419c7b4fa9e56ee7e992e407bb67434d82b2b62782708dd394aef1b3c553
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a9befc852fce59e3f31dbd1ddffa5cf0df25c116552af48005a7413ecf05d33a
[INFO] running `Command { std: "docker" "start" "-a" "a9befc852fce59e3f31dbd1ddffa5cf0df25c116552af48005a7413ecf05d33a", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.70
[INFO] [stderr]    Compiling libc v0.2.151
[INFO] [stderr]    Compiling pkg-config v0.3.27
[INFO] [stderr]    Compiling thiserror v1.0.51
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]    Compiling libudev-sys v0.1.4
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]    Compiling syn v2.0.41
[INFO] [stderr]     Checking nix v0.26.4
[INFO] [stderr]     Checking libudev v0.3.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.51
[INFO] [stderr]     Checking unescaper v0.1.3
[INFO] [stderr]     Checking serialport v4.3.0
[INFO] [stderr]     Checking neutron v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `serial_path` and `serial_connection_config` are never read
[INFO] [stdout]   --> src/connection/serial_connection.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 59 | pub struct SerialConnection {
[INFO] [stdout]    |            ---------------- fields in this struct
[INFO] [stdout] 60 |     serial_port: Box<dyn SerialPort>,
[INFO] [stdout] 61 |     serial_path: String,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 62 |     serial_connection_config: SerialConnectionConfig,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `serial_path` and `serial_connection_config` are never read
[INFO] [stdout]   --> src/connection/serial_connection.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 59 | pub struct SerialConnection {
[INFO] [stdout]    |            ---------------- fields in this struct
[INFO] [stdout] 60 |     serial_port: Box<dyn SerialPort>,
[INFO] [stdout] 61 |     serial_path: String,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 62 |     serial_connection_config: SerialConnectionConfig,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.20s
[INFO] running `Command { std: "docker" "inspect" "a9befc852fce59e3f31dbd1ddffa5cf0df25c116552af48005a7413ecf05d33a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9befc852fce59e3f31dbd1ddffa5cf0df25c116552af48005a7413ecf05d33a", kill_on_drop: false }`
[INFO] [stdout] a9befc852fce59e3f31dbd1ddffa5cf0df25c116552af48005a7413ecf05d33a