[INFO] fetching crate a4-core 0.0.4...
[INFO] checking a4-core-0.0.4 against master#350d0ef0ec0493e6d21cfb265cb8211a0e74d766 for pr-145342-1
[INFO] extracting crate a4-core 0.0.4 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate a4-core 0.0.4
[INFO] finished tweaking crates.io crate a4-core 0.0.4
[INFO] tweaked toml for crates.io crate a4-core 0.0.4 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate a4-core 0.0.4 on toolchain 350d0ef0ec0493e6d21cfb265cb8211a0e74d766
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "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" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 20 packages to latest compatible versions
[INFO] [stderr]       Adding heapless v0.7.17 (available: v0.9.1)
[INFO] [stderr]       Adding postcard v0.7.3 (available: v1.1.3)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded postcard-cobs v0.1.5-pre
[INFO] [stderr]   Downloaded postcard v0.7.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9127f762fd2143a918712fa6b8f1675bad029e1a6f1204c17dcd964615e6c52a
[INFO] running `Command { std: "docker" "start" "-a" "9127f762fd2143a918712fa6b8f1675bad029e1a6f1204c17dcd964615e6c52a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9127f762fd2143a918712fa6b8f1675bad029e1a6f1204c17dcd964615e6c52a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9127f762fd2143a918712fa6b8f1675bad029e1a6f1204c17dcd964615e6c52a", kill_on_drop: false }`
[INFO] [stdout] 9127f762fd2143a918712fa6b8f1675bad029e1a6f1204c17dcd964615e6c52a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4b03ecd432a6eac335d906662cce61ee186f344f899b923558f0b8233ae8067f
[INFO] running `Command { std: "docker" "start" "-a" "4b03ecd432a6eac335d906662cce61ee186f344f899b923558f0b8233ae8067f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.101
[INFO] [stderr]    Compiling unicode-ident v1.0.18
[INFO] [stderr]    Compiling semver v1.0.26
[INFO] [stderr]    Compiling autocfg v1.5.0
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]     Checking byteorder v1.5.0
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]     Checking postcard-cobs v0.1.5-pre
[INFO] [stderr]     Checking hash32 v0.2.1
[INFO] [stderr]    Compiling lock_api v0.4.13
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stderr]    Compiling rustc_version v0.4.1
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling heapless v0.7.17
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]     Checking postcard v0.7.3
[INFO] [stderr]     Checking a4-core v0.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `err` is never read
[INFO] [stdout]   --> src/nostd_rt.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct HVecStack<T, const N: usize> {
[INFO] [stdout]    |            --------- field in this struct
[INFO] [stdout] 16 |     data: Vec<T, N>,
[INFO] [stdout] 17 |     err: Error,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `HVecStack` 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: field `err` is never read
[INFO] [stdout]   --> src/std_rt.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct StdVecStack<T> {
[INFO] [stdout]    |            ----------- field in this struct
[INFO] [stdout] 12 |     data: Vec<T>,
[INFO] [stdout] 13 |     err: Error,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `StdVecStack` 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: field `contents` is never read
[INFO] [stdout]    --> src/compiler.rs:248:9
[INFO] [stdout]     |
[INFO] [stdout] 247 |     Comment {
[INFO] [stdout]     |     ------- field in this variant
[INFO] [stdout] 248 |         contents: Vec<String>,
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Chunk` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `err` is never read
[INFO] [stdout]   --> src/nostd_rt.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct HVecStack<T, const N: usize> {
[INFO] [stdout]    |            --------- field in this struct
[INFO] [stdout] 16 |     data: Vec<T, N>,
[INFO] [stdout] 17 |     err: Error,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `HVecStack` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 11.91s
[INFO] running `Command { std: "docker" "inspect" "4b03ecd432a6eac335d906662cce61ee186f344f899b923558f0b8233ae8067f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4b03ecd432a6eac335d906662cce61ee186f344f899b923558f0b8233ae8067f", kill_on_drop: false }`
[INFO] [stdout] 4b03ecd432a6eac335d906662cce61ee186f344f899b923558f0b8233ae8067f