[INFO] fetching crate derail-report 0.1.0...
[INFO] checking derail-report-0.1.0 against try#81ab7f2139295590561adbe6d5b0aaa2feff765f for pr-146470-4
[INFO] extracting crate derail-report 0.1.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate derail-report 0.1.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate derail-report 0.1.0
[INFO] tweaked toml for crates.io crate derail-report 0.1.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate derail-report 0.1.0 on toolchain 81ab7f2139295590561adbe6d5b0aaa2feff765f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+81ab7f2139295590561adbe6d5b0aaa2feff765f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate derail-report 0.1.0 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" "+81ab7f2139295590561adbe6d5b0aaa2feff765f" "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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+81ab7f2139295590561adbe6d5b0aaa2feff765f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 71eac4fd0a446b1e41c54d40a1ddd3ece836f89d7621439304315aa7c51d2a6d
[INFO] running `Command { std: "docker" "start" "-a" "71eac4fd0a446b1e41c54d40a1ddd3ece836f89d7621439304315aa7c51d2a6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "71eac4fd0a446b1e41c54d40a1ddd3ece836f89d7621439304315aa7c51d2a6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71eac4fd0a446b1e41c54d40a1ddd3ece836f89d7621439304315aa7c51d2a6d", kill_on_drop: false }`
[INFO] [stdout] 71eac4fd0a446b1e41c54d40a1ddd3ece836f89d7621439304315aa7c51d2a6d
[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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+81ab7f2139295590561adbe6d5b0aaa2feff765f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f9f3ee40b4530f22c1e9de6b63b7c4c98ba9d7b130895d6d858b0b0db5dd2920
[INFO] running `Command { std: "docker" "start" "-a" "f9f3ee40b4530f22c1e9de6b63b7c4c98ba9d7b130895d6d858b0b0db5dd2920", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.95
[INFO] [stderr]    Compiling libc v0.2.174
[INFO] [stderr]    Compiling unicode-ident v1.0.18
[INFO] [stderr]     Checking once_cell v1.21.3
[INFO] [stderr]     Checking similar v2.7.0
[INFO] [stderr]     Checking derail v0.3.0
[INFO] [stderr]     Checking derail-report v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0446]: crate-private trait `Buffer<T>` in public interface
[INFO] [stdout]   --> src/buffer.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     type Buffer<T>: Buffer<T>
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^ can't leak crate-private trait
[INFO] [stdout] ...
[INFO] [stdout] 78 | pub(crate) trait Buffer<T> {
[INFO] [stdout]    | -------------------------- `Buffer<T>` declared as crate-private
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this lint expectation is unfulfilled
[INFO] [stdout]   --> src/buffer.rs:15:14
[INFO] [stdout]    |
[INFO] [stdout] 15 |     #[expect(private_bounds)]
[INFO] [stdout]    |              ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unfulfilled_lint_expectations)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0446`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `derail-report` (lib) 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" "f9f3ee40b4530f22c1e9de6b63b7c4c98ba9d7b130895d6d858b0b0db5dd2920", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9f3ee40b4530f22c1e9de6b63b7c4c98ba9d7b130895d6d858b0b0db5dd2920", kill_on_drop: false }`
[INFO] [stdout] f9f3ee40b4530f22c1e9de6b63b7c4c98ba9d7b130895d6d858b0b0db5dd2920