[INFO] fetching crate dfu 0.4.2...
[INFO] checking dfu-0.4.2 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] extracting crate dfu 0.4.2 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate dfu 0.4.2
[INFO] finished tweaking crates.io crate dfu 0.4.2
[INFO] tweaked toml for crates.io crate dfu 0.4.2 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate dfu 0.4.2 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 17 packages to latest compatible versions
[INFO] [stderr]       Adding bitflags v1.2.1 (available: v1.3.2)
[INFO] [stderr]       Adding nix v0.20.2 (available: v0.30.1)
[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 sysfs-serde v0.2.3
[INFO] [stderr]   Downloaded usbapi v0.4.2
[INFO] [stderr]   Downloaded nix v0.20.2
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4a8e13f67f87d458f5cf90c31182c3ec5379791501df6da28a27b52ca245b08d
[INFO] running `Command { std: "docker" "start" "-a" "4a8e13f67f87d458f5cf90c31182c3ec5379791501df6da28a27b52ca245b08d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4a8e13f67f87d458f5cf90c31182c3ec5379791501df6da28a27b52ca245b08d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a8e13f67f87d458f5cf90c31182c3ec5379791501df6da28a27b52ca245b08d", kill_on_drop: false }`
[INFO] [stdout] 4a8e13f67f87d458f5cf90c31182c3ec5379791501df6da28a27b52ca245b08d
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3e06424b7bdb873d0aad2694a495e984e68095f5b0e064c24381c2a948eaef17
[INFO] running `Command { std: "docker" "start" "-a" "3e06424b7bdb873d0aad2694a495e984e68095f5b0e064c24381c2a948eaef17", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.95
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling libc v0.2.174
[INFO] [stderr]     Checking cfg-if v1.0.1
[INFO] [stderr]     Checking sysfs-serde v0.2.3
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling syn v2.0.104
[INFO] [stderr]     Checking nix v0.20.2
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]     Checking usbapi v0.4.2
[INFO] [stderr]     Checking serde v1.0.219
[INFO] [stderr]     Checking dfu v0.4.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::slice::Iter`
[INFO] [stdout]  --> src/core.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::slice::Iter;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::slice::Iter`
[INFO] [stdout]  --> src/core.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::slice::Iter;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/core.rs:162:13
[INFO] [stdout]     |
[INFO] [stdout] 162 |         let mut usb =
[INFO] [stdout]     |             ----^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/core.rs:162:13
[INFO] [stdout]     |
[INFO] [stdout] 162 |         let mut usb =
[INFO] [stdout]     |             ----^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `length`, `descriptor_type`, `attributes`, `detach_timeout`, and `dfu_version` are never read
[INFO] [stdout]   --> src/core.rs:72:5
[INFO] [stdout]    |
[INFO] [stdout] 71 | struct DfuDescriptor {
[INFO] [stdout]    |        ------------- fields in this struct
[INFO] [stdout] 72 |     length: u8,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 73 |     descriptor_type: u8,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 74 |     attributes: u8,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 75 |     detach_timeout: u16,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 76 |     transfer_size: u16,
[INFO] [stdout] 77 |     dfu_version: u8,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `length`, `descriptor_type`, `attributes`, `detach_timeout`, and `dfu_version` are never read
[INFO] [stdout]   --> src/core.rs:72:5
[INFO] [stdout]    |
[INFO] [stdout] 71 | struct DfuDescriptor {
[INFO] [stdout]    |        ------------- fields in this struct
[INFO] [stdout] 72 |     length: u8,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 73 |     descriptor_type: u8,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 74 |     attributes: u8,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 75 |     detach_timeout: u16,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 76 |     transfer_size: u16,
[INFO] [stdout] 77 |     dfu_version: u8,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.82s
[INFO] running `Command { std: "docker" "inspect" "3e06424b7bdb873d0aad2694a495e984e68095f5b0e064c24381c2a948eaef17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3e06424b7bdb873d0aad2694a495e984e68095f5b0e064c24381c2a948eaef17", kill_on_drop: false }`
[INFO] [stdout] 3e06424b7bdb873d0aad2694a495e984e68095f5b0e064c24381c2a948eaef17