[INFO] cloning repository https://github.com/BilinearLabs/rs-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/BilinearLabs/rs-merkle-tree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBilinearLabs%2Frs-merkle-tree", kill_on_drop: false }`
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[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 85c496bde6bdf125b5fc4aa8dabc2b73fae62237
[INFO] checking BilinearLabs/rs-merkle-tree against master#a33907a7a5381473eec8bcfa0c56e05a856a911c for pr-151539
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBilinearLabs%2Frs-merkle-tree" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
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[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/BilinearLabs/rs-merkle-tree
[INFO] finished tweaking git repo https://github.com/BilinearLabs/rs-merkle-tree
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[INFO] validating manifest of git repo https://github.com/BilinearLabs/rs-merkle-tree on toolchain a33907a7a5381473eec8bcfa0c56e05a856a911c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a33907a7a5381473eec8bcfa0c56e05a856a911c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a33907a7a5381473eec8bcfa0c56e05a856a911c" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a33907a7a5381473eec8bcfa0c56e05a856a911c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "9ebbee948450660b72243f51c174cb87b4b23c9166e537db9605d5564da3ad06", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+a33907a7a5381473eec8bcfa0c56e05a856a911c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] [stdout] warning: unused import: `Store`
[INFO] [stdout]  --> tests/tree.rs:4:49
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rs_merkle_tree::{to_node, MerkleTree, Node, Store};
[INFO] [stdout]   |                                                 ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dir_size` is never used
[INFO] [stdout]   --> tests/tree.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn dir_size(path: &Path) -> u64 {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_size` is never used
[INFO] [stdout]    --> tests/tree.rs:126:4
[INFO] [stdout]     |
[INFO] [stdout] 126 | fn print_size(name: &str, file: &str, num_leaves: u64) {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 39.25s
[INFO] running `Command { std: "docker" "inspect" "4e6e639e2aadbca2ca94ab020533894a9362170957c9484dd0073b2d79127c8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e6e639e2aadbca2ca94ab020533894a9362170957c9484dd0073b2d79127c8a", kill_on_drop: false }`
[INFO] [stdout] 4e6e639e2aadbca2ca94ab020533894a9362170957c9484dd0073b2d79127c8a