[INFO] crate merkle_tree 0.1.0 is already in cache
[INFO] checking merkle_tree-0.1.0 against master#73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de for pr-68325
[INFO] extracting crate merkle_tree 0.1.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate merkle_tree 0.1.0 on toolchain 73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de
[INFO] running `"/workspace/cargo-home/bin/cargo" "+73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate merkle_tree 0.1.0
[INFO] finished tweaking crates.io crate merkle_tree 0.1.0
[INFO] tweaked toml for crates.io crate merkle_tree 0.1.0 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "MAP_USER_ID=0" "-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" "+73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] aa4ade8332798505f8f1a76faabdcc476b9a4c1b56f38c4b6d2af38f12c3cd2e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "aa4ade8332798505f8f1a76faabdcc476b9a4c1b56f38c4b6d2af38f12c3cd2e"`
[INFO] [stderr]     Checking hex-slice v0.1.4
[INFO] [stderr]     Checking bincode v0.8.0
[INFO] [stderr]     Checking rayon-core v1.7.0
[INFO] [stderr]     Checking rayon v0.7.1
[INFO] [stderr]     Checking merkle_tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `self::crypto::sha2::Sha256`
[INFO] [stderr]   --> tests/bench_append.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     use self::crypto::sha2::Sha256;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `self::crypto::digest::Digest`
[INFO] [stderr]   --> tests/bench_append.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     use self::crypto::digest::Digest;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> tests/bench_build_tree.rs:518:30
[INFO] [stderr]     |
[INFO] [stderr] 518 |             (0..n).fold((), |a, b| {
[INFO] [stderr]     |                              ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]    --> tests/bench_build_tree.rs:518:33
[INFO] [stderr]     |
[INFO] [stderr] 518 |             (0..n).fold((), |a, b| {
[INFO] [stderr]     |                                 ^ help: consider prefixing with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.10s
[INFO] running `"docker" "inspect" "aa4ade8332798505f8f1a76faabdcc476b9a4c1b56f38c4b6d2af38f12c3cd2e"`
[INFO] running `"docker" "rm" "-f" "aa4ade8332798505f8f1a76faabdcc476b9a4c1b56f38c4b6d2af38f12c3cd2e"`
[INFO] [stdout] aa4ade8332798505f8f1a76faabdcc476b9a4c1b56f38c4b6d2af38f12c3cd2e