[INFO] cloning repository https://github.com/solcloud/virtiofsd
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/solcloud/virtiofsd" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsolcloud%2Fvirtiofsd", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsolcloud%2Fvirtiofsd'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] acde2df07b816b4306b0c541b1d55045be49cfff
[INFO] checking solcloud/virtiofsd against try#3857be5045fe74bd0f296f6f4c23db10f8857f73 for pr-156807
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsolcloud%2Fvirtiofsd" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/solcloud/virtiofsd
[INFO] finished tweaking git repo https://github.com/solcloud/virtiofsd
[INFO] tweaked toml for git repo https://github.com/solcloud/virtiofsd written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/solcloud/virtiofsd on toolchain 3857be5045fe74bd0f296f6f4c23db10f8857f73
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3857be5045fe74bd0f296f6f4c23db10f8857f73" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/solcloud/virtiofsd 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" "+3857be5045fe74bd0f296f6f4c23db10f8857f73" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded vhost-user-backend v0.4.0
[INFO] [stderr]   Downloaded vmm-sys-util v0.9.0
[INFO] [stderr]   Downloaded virtio-bindings v0.1.0
[INFO] [stderr]   Downloaded syslog v6.0.1
[INFO] [stderr]   Downloaded unicode-ident v1.0.0
[INFO] [stderr]   Downloaded vm-memory v0.8.0
[INFO] [stderr]   Downloaded capng v0.2.2
[INFO] [stderr]   Downloaded syn v1.0.95
[INFO] [stderr]   Downloaded vhost v0.4.0
[INFO] [stderr]   Downloaded virtio-queue v0.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+3857be5045fe74bd0f296f6f4c23db10f8857f73" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eae9ce63d7a3557aee6bc30f870440a3fe67b97265f6a7bfeadee0735258ac1f
[INFO] running `Command { std: "docker" "start" "-a" "eae9ce63d7a3557aee6bc30f870440a3fe67b97265f6a7bfeadee0735258ac1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eae9ce63d7a3557aee6bc30f870440a3fe67b97265f6a7bfeadee0735258ac1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eae9ce63d7a3557aee6bc30f870440a3fe67b97265f6a7bfeadee0735258ac1f", kill_on_drop: false }`
[INFO] [stdout] eae9ce63d7a3557aee6bc30f870440a3fe67b97265f6a7bfeadee0735258ac1f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+3857be5045fe74bd0f296f6f4c23db10f8857f73" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 30bdd544128d6670489d5fc7faaf8b84014cf7ffc1cd97731c99eb03b0f091e7
[INFO] running `Command { std: "docker" "start" "-a" "30bdd544128d6670489d5fc7faaf8b84014cf7ffc1cd97731c99eb03b0f091e7", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling futures-core v0.3.21
[INFO] [stderr]    Compiling futures-task v0.3.21
[INFO] [stderr]    Compiling futures-channel v0.3.21
[INFO] [stderr]     Checking arc-swap v1.5.0
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]     Checking futures-sink v0.3.21
[INFO] [stderr]    Compiling error-chain v0.12.4
[INFO] [stderr]     Checking futures-io v0.3.21
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]     Checking slab v0.4.6
[INFO] [stderr]    Compiling unicode-segmentation v1.9.0
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]    Compiling capng v0.2.2
[INFO] [stderr]     Checking num_threads v0.1.6
[INFO] [stderr]     Checking itoa v1.0.2
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking regex-syntax v0.6.26
[INFO] [stderr]    Compiling libseccomp-sys v0.2.1
[INFO] [stderr]     Checking termcolor v1.1.3
[INFO] [stderr]     Checking virtio-bindings v0.1.0
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking vmm-sys-util v0.9.0
[INFO] [stderr]     Checking vm-memory v0.8.0
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking hostname v0.3.1
[INFO] [stderr]     Checking time v0.3.9
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking regex v1.5.6
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]     Checking syslog v6.0.1
[INFO] [stderr]     Checking vhost v0.4.0
[INFO] [stderr]     Checking virtio-queue v0.3.0
[INFO] [stderr]     Checking vhost-user-backend v0.4.0
[INFO] [stderr]     Checking env_logger v0.8.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling futures-macro v0.3.21
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]     Checking structopt v0.3.26
[INFO] [stderr]     Checking futures-executor v0.3.21
[INFO] [stderr]     Checking futures v0.3.21
[INFO] [stderr]     Checking virtiofsd v1.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `virtq_desc` is never constructed
[INFO] [stdout]    --> src/descriptor_utils.rs:493:8
[INFO] [stdout]     |
[INFO] [stdout] 493 | struct virtq_desc {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `virtq_avail` is never constructed
[INFO] [stdout]    --> src/descriptor_utils.rs:505:8
[INFO] [stdout]     |
[INFO] [stdout] 505 | struct virtq_avail {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]     --> src/passthrough/mod.rs:1503:20
[INFO] [stdout]      |
[INFO] [stdout] 1503 |             Handle(Arc<HandleData>, RawFd),
[INFO] [stdout]      |             ------ ^^^^^^^^^^^^^^^
[INFO] [stdout]      |             |
[INFO] [stdout]      |             field in this variant
[INFO] [stdout]      |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]      |
[INFO] [stdout] 1503 -             Handle(Arc<HandleData>, RawFd),
[INFO] [stdout] 1503 +             Handle((), RawFd),
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/filesystem.rs:323:13
[INFO] [stdout]     |
[INFO] [stdout] 323 |     fn next(&mut self) -> Option<DirEntry>;
[INFO] [stdout]     |             ^^^^^^^^^            ^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |             |
[INFO] [stdout]     |             the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 323 |     fn next(&mut self) -> Option<DirEntry<'_>>;
[INFO] [stdout]     |                                          ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/read_dir.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn next(&mut self) -> Option<DirEntry> {
[INFO] [stdout]    |             ^^^^^^^^^            ^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |             |
[INFO] [stdout]    |             the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn next(&mut self) -> Option<DirEntry<'_>> {
[INFO] [stdout]    |                                          ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]     --> src/passthrough/mod.rs:1503:20
[INFO] [stdout]      |
[INFO] [stdout] 1503 |             Handle(Arc<HandleData>, RawFd),
[INFO] [stdout]      |             ------ ^^^^^^^^^^^^^^^
[INFO] [stdout]      |             |
[INFO] [stdout]      |             field in this variant
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]      |
[INFO] [stdout] 1503 -             Handle(Arc<HandleData>, RawFd),
[INFO] [stdout] 1503 +             Handle((), RawFd),
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/filesystem.rs:323:13
[INFO] [stdout]     |
[INFO] [stdout] 323 |     fn next(&mut self) -> Option<DirEntry>;
[INFO] [stdout]     |             ^^^^^^^^^            ^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |             |
[INFO] [stdout]     |             the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 323 |     fn next(&mut self) -> Option<DirEntry<'_>>;
[INFO] [stdout]     |                                          ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/read_dir.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn next(&mut self) -> Option<DirEntry> {
[INFO] [stdout]    |             ^^^^^^^^^            ^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |             |
[INFO] [stdout]    |             the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn next(&mut self) -> Option<DirEntry<'_>> {
[INFO] [stdout]    |                                          ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:56:23
[INFO] [stdout]    |
[INFO] [stdout] 56 |     CreateKillEventFd(io::Error),
[INFO] [stdout]    |     ----------------- ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Error` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 56 -     CreateKillEventFd(io::Error),
[INFO] [stdout] 56 +     CreateKillEventFd(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:58:22
[INFO] [stdout]    |
[INFO] [stdout] 58 |     CreateThreadPool(io::Error),
[INFO] [stdout]    |     ---------------- ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Error` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 58 -     CreateThreadPool(io::Error),
[INFO] [stdout] 58 +     CreateThreadPool(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:68:18
[INFO] [stdout]    |
[INFO] [stdout] 68 |     ProcessQueue(VhostUserFsError),
[INFO] [stdout]    |     ------------ ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Error` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 68 -     ProcessQueue(VhostUserFsError),
[INFO] [stdout] 68 +     ProcessQueue(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:70:17
[INFO] [stdout]    |
[INFO] [stdout] 70 |     QueueReader(VufDescriptorError),
[INFO] [stdout]    |     ----------- ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Error` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 70 -     QueueReader(VufDescriptorError),
[INFO] [stdout] 70 +     QueueReader(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:72:17
[INFO] [stdout]    |
[INFO] [stdout] 72 |     QueueWriter(VufDescriptorError),
[INFO] [stdout]    |     ----------- ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Error` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 72 -     QueueWriter(VufDescriptorError),
[INFO] [stdout] 72 +     QueueWriter(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:56:23
[INFO] [stdout]    |
[INFO] [stdout] 56 |     CreateKillEventFd(io::Error),
[INFO] [stdout]    |     ----------------- ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Error` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 56 -     CreateKillEventFd(io::Error),
[INFO] [stdout] 56 +     CreateKillEventFd(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:58:22
[INFO] [stdout]    |
[INFO] [stdout] 58 |     CreateThreadPool(io::Error),
[INFO] [stdout]    |     ---------------- ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Error` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 58 -     CreateThreadPool(io::Error),
[INFO] [stdout] 58 +     CreateThreadPool(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:68:18
[INFO] [stdout]    |
[INFO] [stdout] 68 |     ProcessQueue(VhostUserFsError),
[INFO] [stdout]    |     ------------ ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Error` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 68 -     ProcessQueue(VhostUserFsError),
[INFO] [stdout] 68 +     ProcessQueue(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:70:17
[INFO] [stdout]    |
[INFO] [stdout] 70 |     QueueReader(VufDescriptorError),
[INFO] [stdout]    |     ----------- ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Error` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 70 -     QueueReader(VufDescriptorError),
[INFO] [stdout] 70 +     QueueReader(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:72:17
[INFO] [stdout]    |
[INFO] [stdout] 72 |     QueueWriter(VufDescriptorError),
[INFO] [stdout]    |     ----------- ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Error` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 72 -     QueueWriter(VufDescriptorError),
[INFO] [stdout] 72 +     QueueWriter(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.39s
[INFO] running `Command { std: "docker" "inspect" "30bdd544128d6670489d5fc7faaf8b84014cf7ffc1cd97731c99eb03b0f091e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30bdd544128d6670489d5fc7faaf8b84014cf7ffc1cd97731c99eb03b0f091e7", kill_on_drop: false }`
[INFO] [stdout] 30bdd544128d6670489d5fc7faaf8b84014cf7ffc1cd97731c99eb03b0f091e7
