[INFO] fetching crate serial-unit-testing 0.2.4...
[INFO] checking serial-unit-testing-0.2.4 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate serial-unit-testing 0.2.4 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate serial-unit-testing 0.2.4 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 serial-unit-testing 0.2.4
[INFO] finished tweaking crates.io crate serial-unit-testing 0.2.4
[INFO] tweaked toml for crates.io crate serial-unit-testing 0.2.4 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate crates.io crate serial-unit-testing 0.2.4 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]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 7d8119d13de1bbc4909cdfc3d6aa52bfb9181c537313b68f5c5ca2180b930001
[INFO] running `Command { std: "docker" "start" "-a" "7d8119d13de1bbc4909cdfc3d6aa52bfb9181c537313b68f5c5ca2180b930001", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7d8119d13de1bbc4909cdfc3d6aa52bfb9181c537313b68f5c5ca2180b930001", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d8119d13de1bbc4909cdfc3d6aa52bfb9181c537313b68f5c5ca2180b930001", kill_on_drop: false }`
[INFO] [stdout] 7d8119d13de1bbc4909cdfc3d6aa52bfb9181c537313b68f5c5ca2180b930001
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 6bb3acf3f60d6b2ee1c0bf4c47c0a489e4c3730eba216d1fd495c5f828b21b55
[INFO] running `Command { std: "docker" "start" "-a" "6bb3acf3f60d6b2ee1c0bf4c47c0a489e4c3730eba216d1fd495c5f828b21b55", kill_on_drop: false }`
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[INFO] [stderr]     Checking cfg-if v0.1.9
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[INFO] [stderr]     Checking either v1.5.2
[INFO] [stderr]     Checking vec_map v0.8.1
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[INFO] [stderr]     Checking parking_lot_core v0.7.0
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[INFO] [stderr]     Checking parking_lot v0.10.0
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[INFO] [stderr]     Checking serialport v3.3.0
[INFO] [stderr]     Checking serial-unit-testing v0.2.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]   --> src/error.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | use std::convert::From;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `From` is already defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serialport` is imported redundantly
[INFO] [stdout]   --> src/error.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | use serialport;
[INFO] [stdout]    |     ^^^^^^^^^^ the item `serialport` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Box` is imported redundantly
[INFO] [stdout]   --> src/serial/mod.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 | use std::boxed::Box;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `Box` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serialport` is imported redundantly
[INFO] [stdout]   --> src/serial/mod.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | use serialport;
[INFO] [stdout]    |     ^^^^^^^^^^ the item `serialport` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]   --> src/serial/settings.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 | use std::convert::From;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `From` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serialport` is imported redundantly
[INFO] [stdout]   --> src/serial/settings.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | use serialport;
[INFO] [stdout]    |     ^^^^^^^^^^ the item `serialport` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serialport` is imported redundantly
[INFO] [stdout]   --> src/serial/loopback.rs:32:18
[INFO] [stdout]    |
[INFO] [stdout] 32 | use serialport::{self, SerialPort, StopBits, ClearBuffer, FlowControl, DataBits, Error, SerialPortSettings, Parity};
[INFO] [stdout]    |                  ^^^^ the item `serialport` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]   --> src/error.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | use std::convert::From;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `From` is already defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serialport` is imported redundantly
[INFO] [stdout]   --> src/error.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | use serialport;
[INFO] [stdout]    |     ^^^^^^^^^^ the item `serialport` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Box` is imported redundantly
[INFO] [stdout]   --> src/serial/mod.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 | use std::boxed::Box;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `Box` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serialport` is imported redundantly
[INFO] [stdout]   --> src/serial/mod.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | use serialport;
[INFO] [stdout]    |     ^^^^^^^^^^ the item `serialport` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]   --> src/serial/settings.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 | use std::convert::From;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `From` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serialport` is imported redundantly
[INFO] [stdout]   --> src/serial/settings.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | use serialport;
[INFO] [stdout]    |     ^^^^^^^^^^ the item `serialport` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serialport` is imported redundantly
[INFO] [stdout]   --> src/serial/loopback.rs:32:18
[INFO] [stdout]    |
[INFO] [stdout] 32 | use serialport::{self, SerialPort, StopBits, ClearBuffer, FlowControl, DataBits, Error, SerialPortSettings, Parity};
[INFO] [stdout]    |                  ^^^^ the item `serialport` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serialport` is imported redundantly
[INFO] [stdout]   --> src/list.rs:30:18
[INFO] [stdout]    |
[INFO] [stdout] 30 | use serialport::{self, SerialPortType};
[INFO] [stdout]    |                  ^^^^ the item `serialport` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serialport` is imported redundantly
[INFO] [stdout]   --> src/list.rs:30:18
[INFO] [stdout]    |
[INFO] [stdout] 30 | use serialport::{self, SerialPortType};
[INFO] [stdout]    |                  ^^^^ the item `serialport` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` 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 6.56s
[INFO] running `Command { std: "docker" "inspect" "6bb3acf3f60d6b2ee1c0bf4c47c0a489e4c3730eba216d1fd495c5f828b21b55", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6bb3acf3f60d6b2ee1c0bf4c47c0a489e4c3730eba216d1fd495c5f828b21b55", kill_on_drop: false }`
[INFO] [stdout] 6bb3acf3f60d6b2ee1c0bf4c47c0a489e4c3730eba216d1fd495c5f828b21b55