[INFO] fetching crate merkle_tree 0.1.0...
[INFO] checking merkle_tree-0.1.0 against try#b2f80f6008cdafc35b4472bd46afa16cc6b0cd63 for pr-79470
[INFO] extracting crate merkle_tree 0.1.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate merkle_tree 0.1.0 on toolchain b2f80f6008cdafc35b4472bd46afa16cc6b0cd63
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c48dd6e1b652a85098951f2f1e8a665dcf78a5479d423f848dbce5fa3bb2d5b0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c48dd6e1b652a85098951f2f1e8a665dcf78a5479d423f848dbce5fa3bb2d5b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c48dd6e1b652a85098951f2f1e8a665dcf78a5479d423f848dbce5fa3bb2d5b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c48dd6e1b652a85098951f2f1e8a665dcf78a5479d423f848dbce5fa3bb2d5b0", kill_on_drop: false }`
[INFO] [stdout] c48dd6e1b652a85098951f2f1e8a665dcf78a5479d423f848dbce5fa3bb2d5b0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 23e0e6091ee5b8934bee9d470b8034201e4337df4f5d25e35042c96557c22f88
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "23e0e6091ee5b8934bee9d470b8034201e4337df4f5d25e35042c96557c22f88", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling gcc v0.3.55
[INFO] [stderr]     Checking ucd-util v0.1.8
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling serde_json v1.0.60
[INFO] [stderr]     Checking utf8-ranges v1.0.4
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]     Checking hex-slice v0.1.4
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking aho-corasick v0.6.10
[INFO] [stderr]    Compiling syn v1.0.54
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking rayon-core v1.9.0
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking rmp v0.8.9
[INFO] [stderr]     Checking bincode v0.8.0
[INFO] [stderr]     Checking rmp-serde v0.13.7
[INFO] [stderr]     Checking rayon v0.7.1
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking env_logger v0.4.3
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]     Checking merkle_tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `self::crypto::sha2::Sha256`
[INFO] [stdout]   --> tests/bench_append.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     use self::crypto::sha2::Sha256;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self::crypto::digest::Digest`
[INFO] [stdout]   --> tests/bench_append.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     use self::crypto::digest::Digest;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> tests/bench_build_tree.rs:518:30
[INFO] [stdout]     |
[INFO] [stdout] 518 |             (0..n).fold((), |a, b| {
[INFO] [stdout]     |                              ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> tests/bench_build_tree.rs:518:33
[INFO] [stdout]     |
[INFO] [stdout] 518 |             (0..n).fold((), |a, b| {
[INFO] [stdout]     |                                 ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 38.87s
[INFO] running `Command { std: "docker" "inspect" "23e0e6091ee5b8934bee9d470b8034201e4337df4f5d25e35042c96557c22f88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23e0e6091ee5b8934bee9d470b8034201e4337df4f5d25e35042c96557c22f88", kill_on_drop: false }`
[INFO] [stdout] 23e0e6091ee5b8934bee9d470b8034201e4337df4f5d25e35042c96557c22f88