[INFO] fetching crate dtb 0.2.0...
[INFO] checking dtb-0.2.0 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] extracting crate dtb 0.2.0 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate dtb 0.2.0
[INFO] finished tweaking crates.io crate dtb 0.2.0
[INFO] tweaked toml for crates.io crate dtb 0.2.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate dtb 0.2.0 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] crate crates.io crate dtb 0.2.0 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" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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] e28d3a65bf099de88298895d06c1d44b4f0304694edbf427a723c7ce8c164a02
[INFO] running `Command { std: "docker" "start" "-a" "e28d3a65bf099de88298895d06c1d44b4f0304694edbf427a723c7ce8c164a02", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e28d3a65bf099de88298895d06c1d44b4f0304694edbf427a723c7ce8c164a02", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e28d3a65bf099de88298895d06c1d44b4f0304694edbf427a723c7ce8c164a02", kill_on_drop: false }`
[INFO] [stdout] e28d3a65bf099de88298895d06c1d44b4f0304694edbf427a723c7ce8c164a02
[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] 9b0976f04ae0c06444fd1765afe7dc6a2fcb6335639870badcfa536eeaa68445
[INFO] running `Command { std: "docker" "start" "-a" "9b0976f04ae0c06444fd1765afe7dc6a2fcb6335639870badcfa536eeaa68445", kill_on_drop: false }`
[INFO] [stderr]     Checking dtb v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `buf`, `reserved_mem_offset`, `struct_offset`, and `strings_offset` are never read
[INFO] [stdout]   --> src/writer.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub struct Writer<'a> {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 53 |     buf: &'a mut [u8],
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 54 |     reserved_mem_offset: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 55 |     struct_offset: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 56 |     strings_offset: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Writer` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `buf`, `reserved_mem_offset`, `struct_offset`, and `strings_offset` are never read
[INFO] [stdout]   --> src/writer.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub struct Writer<'a> {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 53 |     buf: &'a mut [u8],
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 54 |     reserved_mem_offset: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 55 |     struct_offset: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 56 |     strings_offset: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Writer` has a derived impl for the trait `Debug`, 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 0.54s
[INFO] running `Command { std: "docker" "inspect" "9b0976f04ae0c06444fd1765afe7dc6a2fcb6335639870badcfa536eeaa68445", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b0976f04ae0c06444fd1765afe7dc6a2fcb6335639870badcfa536eeaa68445", kill_on_drop: false }`
[INFO] [stdout] 9b0976f04ae0c06444fd1765afe7dc6a2fcb6335639870badcfa536eeaa68445