[INFO] crate ckb-merkle-mountain-range 0.17.0-pre is already in cache
[INFO] checking ckb-merkle-mountain-range-0.17.0-pre against master#4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb for pr-64672
[INFO] extracting crate ckb-merkle-mountain-range 0.17.0-pre into work/builds/worker-4/source
[INFO] validating manifest of crates.io crate ckb-merkle-mountain-range 0.17.0-pre on toolchain 4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate ckb-merkle-mountain-range 0.17.0-pre
[INFO] finished tweaking crates.io crate ckb-merkle-mountain-range 0.17.0-pre
[INFO] tweaked toml for crates.io crate ckb-merkle-mountain-range 0.17.0-pre written to work/builds/worker-4/source/Cargo.toml
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 3981c8c9dc49662528671eef7a579fd3388b5f45b00efb490497b9841120d517
[INFO] running `"docker" "start" "-a" "3981c8c9dc49662528671eef7a579fd3388b5f45b00efb490497b9841120d517"`
[INFO] [stderr]     Checking faster-hex v0.3.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling blake2b-rs v0.1.5
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking ckb-merkle-mountain-range v0.17.0-pre (/opt/rustwide/workdir)
[INFO] [stderr]     Checking rusty-fork v0.2.2
[INFO] [stderr]     Checking proptest v0.9.4
[INFO] [stderr] error[E0432]: unresolved import `ckb_merkle_mountain_range::tests_util`
[INFO] [stderr]  --> benches/mmr_benchmark.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     tests_util::{MemStore, NumberHash},
[INFO] [stderr]   |     ^^^^^^^^^^ could not find `tests_util` in `ckb_merkle_mountain_range`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::convert::TryFrom`
[INFO] [stderr]   --> benches/mmr_benchmark.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use std::convert::TryFrom;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `MMRStore`
[INFO] [stderr]  --> benches/mmr_benchmark.rs:8:15
[INFO] [stderr]   |
[INFO] [stderr] 8 |     MMRBatch, MMRStore, MMR,
[INFO] [stderr]   |               ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0432`.
[INFO] [stderr] error: could not compile `ckb-merkle-mountain-range`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3981c8c9dc49662528671eef7a579fd3388b5f45b00efb490497b9841120d517"`
[INFO] running `"docker" "rm" "-f" "3981c8c9dc49662528671eef7a579fd3388b5f45b00efb490497b9841120d517"`
[INFO] [stdout] 3981c8c9dc49662528671eef7a579fd3388b5f45b00efb490497b9841120d517