[INFO] cloning repository https://github.com/CharlieFunk1/usb_serial_test
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CharlieFunk1/usb_serial_test" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCharlieFunk1%2Fusb_serial_test", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCharlieFunk1%2Fusb_serial_test'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7f973dfa429e8b6c16fd0f188ac7b0f4ec857ab3
[INFO] building CharlieFunk1/usb_serial_test against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCharlieFunk1%2Fusb_serial_test" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/CharlieFunk1/usb_serial_test on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/CharlieFunk1/usb_serial_test
[INFO] finished tweaking git repo https://github.com/CharlieFunk1/usb_serial_test
[INFO] tweaked toml for git repo https://github.com/CharlieFunk1/usb_serial_test written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/CharlieFunk1/usb_serial_test 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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e4b565dea3bdd2f9df3a50c245c5d9917dcd36b522e1d920e0e34214251c9310
[INFO] running `Command { std: "docker" "start" "-a" "e4b565dea3bdd2f9df3a50c245c5d9917dcd36b522e1d920e0e34214251c9310", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e4b565dea3bdd2f9df3a50c245c5d9917dcd36b522e1d920e0e34214251c9310", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4b565dea3bdd2f9df3a50c245c5d9917dcd36b522e1d920e0e34214251c9310", kill_on_drop: false }`
[INFO] [stdout] e4b565dea3bdd2f9df3a50c245c5d9917dcd36b522e1d920e0e34214251c9310
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 78935cdbbafb5a4910dbd3099729fcedd14c445eb4d2d3b2be8725738eb38f4b
[INFO] running `Command { std: "docker" "start" "-a" "78935cdbbafb5a4910dbd3099729fcedd14c445eb4d2d3b2be8725738eb38f4b", kill_on_drop: false }`
[INFO] [stderr]    Compiling pkg-config v0.3.25
[INFO] [stderr]    Compiling nix v0.24.1
[INFO] [stderr]    Compiling libudev-sys v0.1.4
[INFO] [stderr]    Compiling libudev v0.3.0
[INFO] [stderr]    Compiling serialport v4.2.0
[INFO] [stderr]    Compiling usb_serial_test v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `SerialPortType` and `available_ports`
[INFO] [stdout]  --> src/main.rs:1:18
[INFO] [stdout]   |
[INFO] [stdout] 1 | use serialport::{available_ports, SerialPortType, SerialPort};
[INFO] [stdout]   |                  ^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `IoSlice`
[INFO] [stdout]  --> src/main.rs:2:22
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{Write, IoSlice};
[INFO] [stdout]   |                      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SerialPort`
[INFO] [stdout]  --> src/main.rs:1:51
[INFO] [stdout]   |
[INFO] [stdout] 1 | use serialport::{available_ports, SerialPortType, SerialPort};
[INFO] [stdout]   |                                                   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> src/main.rs:38:6
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let data = String::new();
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.28s
[INFO] running `Command { std: "docker" "inspect" "78935cdbbafb5a4910dbd3099729fcedd14c445eb4d2d3b2be8725738eb38f4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "78935cdbbafb5a4910dbd3099729fcedd14c445eb4d2d3b2be8725738eb38f4b", kill_on_drop: false }`
[INFO] [stdout] 78935cdbbafb5a4910dbd3099729fcedd14c445eb4d2d3b2be8725738eb38f4b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b9dc406b76396ccea0b50e3686c8d36e0d8287fea1b0c459fc90c6dae55f157f
[INFO] running `Command { std: "docker" "start" "-a" "b9dc406b76396ccea0b50e3686c8d36e0d8287fea1b0c459fc90c6dae55f157f", kill_on_drop: false }`
[INFO] [stderr]    Compiling usb_serial_test v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `SerialPortType` and `available_ports`
[INFO] [stdout]  --> src/main.rs:1:18
[INFO] [stdout]   |
[INFO] [stdout] 1 | use serialport::{available_ports, SerialPortType, SerialPort};
[INFO] [stdout]   |                  ^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `IoSlice`
[INFO] [stdout]  --> src/main.rs:2:22
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{Write, IoSlice};
[INFO] [stdout]   |                      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SerialPort`
[INFO] [stdout]  --> src/main.rs:1:51
[INFO] [stdout]   |
[INFO] [stdout] 1 | use serialport::{available_ports, SerialPortType, SerialPort};
[INFO] [stdout]   |                                                   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> src/main.rs:38:6
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let data = String::new();
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] running `Command { std: "docker" "inspect" "b9dc406b76396ccea0b50e3686c8d36e0d8287fea1b0c459fc90c6dae55f157f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b9dc406b76396ccea0b50e3686c8d36e0d8287fea1b0c459fc90c6dae55f157f", kill_on_drop: false }`
[INFO] [stdout] b9dc406b76396ccea0b50e3686c8d36e0d8287fea1b0c459fc90c6dae55f157f