[INFO] cloning repository https://github.com/jacksmithinsulander/rust-merkle-tree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jacksmithinsulander/rust-merkle-tree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjacksmithinsulander%2Frust-merkle-tree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjacksmithinsulander%2Frust-merkle-tree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a903cf4c7ff08a422b56bc5f199193476b336bb1
[INFO] checking jacksmithinsulander/rust-merkle-tree against try#da0275e101cdc809ce291ed8b64d6f82c6b65467 for pr-134276
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjacksmithinsulander%2Frust-merkle-tree" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jacksmithinsulander/rust-merkle-tree on toolchain da0275e101cdc809ce291ed8b64d6f82c6b65467
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+da0275e101cdc809ce291ed8b64d6f82c6b65467" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jacksmithinsulander/rust-merkle-tree
[INFO] finished tweaking git repo https://github.com/jacksmithinsulander/rust-merkle-tree
[INFO] tweaked toml for git repo https://github.com/jacksmithinsulander/rust-merkle-tree written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/jacksmithinsulander/rust-merkle-tree 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" "+da0275e101cdc809ce291ed8b64d6f82c6b65467" "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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+da0275e101cdc809ce291ed8b64d6f82c6b65467" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1145448c432f6cf12bee60dcf3169fef1051430c48eae864a7d2a2a2a894ff9b
[INFO] running `Command { std: "docker" "start" "-a" "1145448c432f6cf12bee60dcf3169fef1051430c48eae864a7d2a2a2a894ff9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1145448c432f6cf12bee60dcf3169fef1051430c48eae864a7d2a2a2a894ff9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1145448c432f6cf12bee60dcf3169fef1051430c48eae864a7d2a2a2a894ff9b", kill_on_drop: false }`
[INFO] [stdout] 1145448c432f6cf12bee60dcf3169fef1051430c48eae864a7d2a2a2a894ff9b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+da0275e101cdc809ce291ed8b64d6f82c6b65467" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4fe3847c2452093a85dd9ece5d91d2e8b626862ea5c622caeb879abb7347efda
[INFO] running `Command { std: "docker" "start" "-a" "4fe3847c2452093a85dd9ece5d91d2e8b626862ea5c622caeb879abb7347efda", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]    Compiling version_check v0.9.5
[INFO] [stderr]    Compiling proc-macro2 v1.0.86
[INFO] [stderr]    Compiling unicode-ident v1.0.13
[INFO] [stderr]    Compiling serde v1.0.210
[INFO] [stderr]    Compiling serde_json v1.0.128
[INFO] [stderr]     Checking memchr v2.7.4
[INFO] [stderr]     Checking itoa v1.0.11
[INFO] [stderr]     Checking keccak v0.1.5
[INFO] [stderr]     Checking ryu v1.0.18
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling syn v2.0.79
[INFO] [stderr]     Checking crypto-common v0.1.6
[INFO] [stderr]     Checking block-buffer v0.10.4
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking sha3 v0.10.8
[INFO] [stderr]    Compiling serde_derive v1.0.210
[INFO] [stderr]     Checking merkle-tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `temp_leaves`
[INFO] [stdout]   --> src/main.rs:56:13
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let mut temp_leaves: Vec<String>;
[INFO] [stdout]    |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_temp_leaves`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `combined_hash`
[INFO] [stdout]   --> src/main.rs:64:17
[INFO] [stdout]    |
[INFO] [stdout] 64 |             let combined_hash = match chunk
[INFO] [stdout]    |                 ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_combined_hash`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `temp_leaves`
[INFO] [stdout]   --> src/main.rs:56:13
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let mut temp_leaves: Vec<String>;
[INFO] [stdout]    |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_temp_leaves`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `combined_hash`
[INFO] [stdout]   --> src/main.rs:64:17
[INFO] [stdout]    |
[INFO] [stdout] 64 |             let combined_hash = match chunk
[INFO] [stdout]    |                 ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_combined_hash`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 15.49s
[INFO] running `Command { std: "docker" "inspect" "4fe3847c2452093a85dd9ece5d91d2e8b626862ea5c622caeb879abb7347efda", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4fe3847c2452093a85dd9ece5d91d2e8b626862ea5c622caeb879abb7347efda", kill_on_drop: false }`
[INFO] [stdout] 4fe3847c2452093a85dd9ece5d91d2e8b626862ea5c622caeb879abb7347efda