[INFO] fetching crate br-serial 0.0.1...
[INFO] checking br-serial-0.0.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate br-serial 0.0.1 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate br-serial 0.0.1 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate br-serial 0.0.1
[INFO] finished tweaking crates.io crate br-serial 0.0.1
[INFO] tweaked toml for crates.io crate br-serial 0.0.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate crates.io crate br-serial 0.0.1 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded env_logger v0.10.0
[INFO] [stderr]   Downloaded mach2 v0.4.1
[INFO] [stderr]   Downloaded serial2 v0.2.6
[INFO] [stderr]   Downloaded libudev v0.3.0
[INFO] [stderr]   Downloaded serialport v4.2.2
[INFO] [stderr]   Downloaded aho-corasick v1.1.1
[INFO] [stderr]   Downloaded regex-automata v0.3.9
[INFO] [stderr]   Downloaded regex v1.9.6
[INFO] [stderr]   Downloaded linux-raw-sys v0.4.9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3e4e3a782bb9e753aec2093ca66c1554f7462b3e88a35780d8d3b3ed3649e529
[INFO] running `Command { std: "docker" "start" "-a" "3e4e3a782bb9e753aec2093ca66c1554f7462b3e88a35780d8d3b3ed3649e529", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3e4e3a782bb9e753aec2093ca66c1554f7462b3e88a35780d8d3b3ed3649e529", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3e4e3a782bb9e753aec2093ca66c1554f7462b3e88a35780d8d3b3ed3649e529", kill_on_drop: false }`
[INFO] [stdout] 3e4e3a782bb9e753aec2093ca66c1554f7462b3e88a35780d8d3b3ed3649e529
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 288ae6abf1ca540512e2d9685219a3d4bb31b50e5092a6c85b7bad4c90228fc0
[INFO] running `Command { std: "docker" "start" "-a" "288ae6abf1ca540512e2d9685219a3d4bb31b50e5092a6c85b7bad4c90228fc0", kill_on_drop: false }`
[INFO] [stderr]    Compiling pkg-config v0.3.27
[INFO] [stderr]    Compiling rustix v0.38.17
[INFO] [stderr]     Checking memchr v2.6.4
[INFO] [stderr]     Checking linux-raw-sys v0.4.9
[INFO] [stderr]     Checking regex-syntax v0.7.5
[INFO] [stderr]     Checking bitflags v2.4.0
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]     Checking json v0.12.4
[INFO] [stderr]     Checking termcolor v1.1.3
[INFO] [stderr]     Checking nix v0.26.4
[INFO] [stderr]     Checking serial2 v0.2.6
[INFO] [stderr]    Compiling libudev-sys v0.1.4
[INFO] [stderr]     Checking aho-corasick v1.1.1
[INFO] [stderr]     Checking libudev v0.3.0
[INFO] [stderr]     Checking is-terminal v0.4.9
[INFO] [stderr]     Checking serialport v4.2.2
[INFO] [stderr]     Checking br-serial v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking regex-automata v0.3.9
[INFO] [stdout] warning: field `step` is never read
[INFO] [stdout]   --> src/usb.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Usb {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] 11 |     pub com: String,
[INFO] [stdout] 12 |     pub step: i32,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Usb` has derived impls for the traits `Debug` and `Clone`, but these are 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]     Checking regex v1.9.6
[INFO] [stderr]     Checking env_logger v0.10.0
[INFO] [stdout] warning: field `step` is never read
[INFO] [stdout]   --> src/usb.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Usb {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] 11 |     pub com: String,
[INFO] [stdout] 12 |     pub step: i32,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Usb` has derived impls for the traits `Debug` and `Clone`, but these are 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 4.82s
[INFO] running `Command { std: "docker" "inspect" "288ae6abf1ca540512e2d9685219a3d4bb31b50e5092a6c85b7bad4c90228fc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "288ae6abf1ca540512e2d9685219a3d4bb31b50e5092a6c85b7bad4c90228fc0", kill_on_drop: false }`
[INFO] [stdout] 288ae6abf1ca540512e2d9685219a3d4bb31b50e5092a6c85b7bad4c90228fc0
[INFO] checking br-serial-0.0.1 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate br-serial 0.0.1 into /workspace/builds/worker-0-tc2/source
[INFO] validating manifest of crates.io crate br-serial 0.0.1 on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate br-serial 0.0.1
[INFO] finished tweaking crates.io crate br-serial 0.0.1
[INFO] tweaked toml for crates.io crate br-serial 0.0.1 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate crates.io crate br-serial 0.0.1 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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 19f493b946dcbcce2aef27ad9685271201a9654f5131f9dbe8b41a43ce233803
[INFO] running `Command { std: "docker" "start" "-a" "19f493b946dcbcce2aef27ad9685271201a9654f5131f9dbe8b41a43ce233803", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "19f493b946dcbcce2aef27ad9685271201a9654f5131f9dbe8b41a43ce233803", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19f493b946dcbcce2aef27ad9685271201a9654f5131f9dbe8b41a43ce233803", kill_on_drop: false }`
[INFO] [stdout] 19f493b946dcbcce2aef27ad9685271201a9654f5131f9dbe8b41a43ce233803
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eabaffa0600e70427d40e1308af45ba08d7167ed29747d1a59728de60c01d03b
[INFO] running `Command { std: "docker" "start" "-a" "eabaffa0600e70427d40e1308af45ba08d7167ed29747d1a59728de60c01d03b", kill_on_drop: false }`
[INFO] [stderr]    Compiling pkg-config v0.3.27
[INFO] [stderr]     Checking memchr v2.6.4
[INFO] [stderr]    Compiling rustix v0.38.17
[INFO] [stderr]     Checking bitflags v2.4.0
[INFO] [stderr]     Checking linux-raw-sys v0.4.9
[INFO] [stderr]     Checking regex-syntax v0.7.5
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]     Checking json v0.12.4
[INFO] [stderr]     Checking termcolor v1.1.3
[INFO] [stderr]     Checking nix v0.26.4
[INFO] [stderr]     Checking serial2 v0.2.6
[INFO] [stderr]    Compiling libudev-sys v0.1.4
[INFO] [stderr]     Checking aho-corasick v1.1.1
[INFO] [stderr]     Checking libudev v0.3.0
[INFO] [stderr]     Checking is-terminal v0.4.9
[INFO] [stderr]     Checking serialport v4.2.2
[INFO] [stderr]     Checking regex-automata v0.3.9
[INFO] [stderr]     Checking br-serial v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `step` is never read
[INFO] [stdout]   --> src/usb.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Usb {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] 11 |     pub com: String,
[INFO] [stdout] 12 |     pub step: i32,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Usb` has derived impls for the traits `Debug` and `Clone`, but these are 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]     Checking regex v1.9.6
[INFO] [stderr]     Checking env_logger v0.10.0
[INFO] [stdout] warning: field `step` is never read
[INFO] [stdout]   --> src/usb.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Usb {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] 11 |     pub com: String,
[INFO] [stdout] 12 |     pub step: i32,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Usb` has derived impls for the traits `Debug` and `Clone`, but these are 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 6.67s
[INFO] running `Command { std: "docker" "inspect" "eabaffa0600e70427d40e1308af45ba08d7167ed29747d1a59728de60c01d03b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eabaffa0600e70427d40e1308af45ba08d7167ed29747d1a59728de60c01d03b", kill_on_drop: false }`
[INFO] [stdout] eabaffa0600e70427d40e1308af45ba08d7167ed29747d1a59728de60c01d03b