[INFO] fetching crate thermal_printer 0.1.1...
[INFO] checking thermal_printer-0.1.1 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] extracting crate thermal_printer 0.1.1 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate thermal_printer 0.1.1
[INFO] finished tweaking crates.io crate thermal_printer 0.1.1
[INFO] tweaked toml for crates.io crate thermal_printer 0.1.1 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate thermal_printer 0.1.1 on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 12 packages to latest compatible versions
[INFO] [stderr]       Adding embedded-hal v0.2.7 (available: v1.0.0)
[INFO] [stderr]       Adding nb v0.1.3 (available: v1.1.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serial-embedded-hal v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dbc718eaa8b5b8f43b92a4332c01162c8416474940ee0bddb3aab90ad5302829
[INFO] running `Command { std: "docker" "start" "-a" "dbc718eaa8b5b8f43b92a4332c01162c8416474940ee0bddb3aab90ad5302829", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dbc718eaa8b5b8f43b92a4332c01162c8416474940ee0bddb3aab90ad5302829", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dbc718eaa8b5b8f43b92a4332c01162c8416474940ee0bddb3aab90ad5302829", kill_on_drop: false }`
[INFO] [stdout] dbc718eaa8b5b8f43b92a4332c01162c8416474940ee0bddb3aab90ad5302829
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 48c305cd7bf045e9cf80cd856d0b03381328d2e5accb730ca7ebaa02d158d338
[INFO] running `Command { std: "docker" "start" "-a" "48c305cd7bf045e9cf80cd856d0b03381328d2e5accb730ca7ebaa02d158d338", kill_on_drop: false }`
[INFO] [stderr]     Checking nb v1.1.0
[INFO] [stderr]     Checking termios v0.2.2
[INFO] [stderr]     Checking serial-core v0.4.0
[INFO] [stderr]     Checking ioctl-rs v0.1.6
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]     Checking embedded-hal v0.2.7
[INFO] [stderr]     Checking serial-unix v0.4.0
[INFO] [stderr]     Checking thermal_printer v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `dot_print_time` and `dot_feed_time` are never read
[INFO] [stdout]   --> src/lib.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | pub struct ThermalPrinter<T> where T: serial::Write<u8> {
[INFO] [stdout]    |            -------------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 37 |     dot_print_time: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 38 |     dot_feed_time: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ThermalPrinter` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking serial v0.4.0
[INFO] [stderr]     Checking serial-embedded-hal v0.1.2
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> examples/unix.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     printer.configure(11, 120, 40);
[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] 32 |     let _ = printer.configure(11, 120, 40);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `dot_print_time` and `dot_feed_time` are never read
[INFO] [stdout]   --> src/lib.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | pub struct ThermalPrinter<T> where T: serial::Write<u8> {
[INFO] [stdout]    |            -------------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 37 |     dot_print_time: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 38 |     dot_feed_time: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ThermalPrinter` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.24s
[INFO] running `Command { std: "docker" "inspect" "48c305cd7bf045e9cf80cd856d0b03381328d2e5accb730ca7ebaa02d158d338", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "48c305cd7bf045e9cf80cd856d0b03381328d2e5accb730ca7ebaa02d158d338", kill_on_drop: false }`
[INFO] [stdout] 48c305cd7bf045e9cf80cd856d0b03381328d2e5accb730ca7ebaa02d158d338