[INFO] fetching crate pack-db 0.2.0...
[INFO] testing pack-db-0.2.0 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate pack-db 0.2.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate pack-db 0.2.0
[INFO] finished tweaking crates.io crate pack-db 0.2.0
[INFO] tweaked toml for crates.io crate pack-db 0.2.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate pack-db 0.2.0 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate pack-db 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" "+beta-2025-09-21" "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] 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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 279d3be948c4586c30cddf011606c7dc39b67279dd3b13f552d1418c5da53d7a
[INFO] running `Command { std: "docker" "start" "-a" "279d3be948c4586c30cddf011606c7dc39b67279dd3b13f552d1418c5da53d7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "279d3be948c4586c30cddf011606c7dc39b67279dd3b13f552d1418c5da53d7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "279d3be948c4586c30cddf011606c7dc39b67279dd3b13f552d1418c5da53d7a", kill_on_drop: false }`
[INFO] [stdout] 279d3be948c4586c30cddf011606c7dc39b67279dd3b13f552d1418c5da53d7a
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 83aac98b11029294d506e1518a8abe8e8db8963e43a0e8eb4d4f4f7a42a0d5fa
[INFO] running `Command { std: "docker" "start" "-a" "83aac98b11029294d506e1518a8abe8e8db8963e43a0e8eb4d4f4f7a42a0d5fa", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.81
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling anyhow v1.0.45
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling rmp v0.8.10
[INFO] [stderr]    Compiling rmp-serde v1.0.0-beta.2
[INFO] [stderr]    Compiling pack-db v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.38s
[INFO] running `Command { std: "docker" "inspect" "83aac98b11029294d506e1518a8abe8e8db8963e43a0e8eb4d4f4f7a42a0d5fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "83aac98b11029294d506e1518a8abe8e8db8963e43a0e8eb4d4f4f7a42a0d5fa", kill_on_drop: false }`
[INFO] [stdout] 83aac98b11029294d506e1518a8abe8e8db8963e43a0e8eb4d4f4f7a42a0d5fa
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1c4c91baa4662924148c7544d1757c8375ffd430a4e3b655d99aa51493cae292
[INFO] running `Command { std: "docker" "start" "-a" "1c4c91baa4662924148c7544d1757c8375ffd430a4e3b655d99aa51493cae292", kill_on_drop: false }`
[INFO] [stderr]    Compiling pack-db v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `serde_json`
[INFO] [stdout]  --> examples/serde_json.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use serde_json::{json, Value};
[INFO] [stdout]   |     ^^^^^^^^^^ use of unresolved module or unlinked crate `serde_json`
[INFO] [stdout]   |
[INFO] [stdout] help: to make use of source file examples/serde_json.rs, use `mod serde_json` in this file to declare the module
[INFO] [stdout]   |
[INFO] [stdout] 1 + mod serde_json;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Deserialize` and `Serialize`
[INFO] [stdout]  --> examples/serde_json.rs:2:13
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |             ^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pack-db` (example "serde_json") due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "1c4c91baa4662924148c7544d1757c8375ffd430a4e3b655d99aa51493cae292", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1c4c91baa4662924148c7544d1757c8375ffd430a4e3b655d99aa51493cae292", kill_on_drop: false }`
[INFO] [stdout] 1c4c91baa4662924148c7544d1757c8375ffd430a4e3b655d99aa51493cae292