[INFO] cloning repository https://github.com/yagnadeepxo/MerkleTree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yagnadeepxo/MerkleTree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2FMerkleTree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2FMerkleTree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] aeb6b947f247030222471d541237affe6c942cfe
[INFO] checking yagnadeepxo/MerkleTree against master#22572d0994593197593e2a1b7b18d720a9a349a7 for pr-126452-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2FMerkleTree" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/yagnadeepxo/MerkleTree on toolchain 22572d0994593197593e2a1b7b18d720a9a349a7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/yagnadeepxo/MerkleTree
[INFO] finished tweaking git repo https://github.com/yagnadeepxo/MerkleTree
[INFO] tweaked toml for git repo https://github.com/yagnadeepxo/MerkleTree written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/yagnadeepxo/MerkleTree 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" "+22572d0994593197593e2a1b7b18d720a9a349a7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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_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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 90772ad4235f3c6b8c7976506063760c46d85133c37b0fd87305d83a079d8e8b
[INFO] running `Command { std: "docker" "start" "-a" "90772ad4235f3c6b8c7976506063760c46d85133c37b0fd87305d83a079d8e8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "90772ad4235f3c6b8c7976506063760c46d85133c37b0fd87305d83a079d8e8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90772ad4235f3c6b8c7976506063760c46d85133c37b0fd87305d83a079d8e8b", kill_on_drop: false }`
[INFO] [stdout] 90772ad4235f3c6b8c7976506063760c46d85133c37b0fd87305d83a079d8e8b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e1e35b7e64b2697e16617506eb8a6a663a23ad86e7e86533733310f63660caae
[INFO] running `Command { std: "docker" "start" "-a" "e1e35b7e64b2697e16617506eb8a6a663a23ad86e7e86533733310f63660caae", kill_on_drop: false }`
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]     Checking cpufeatures v0.2.9
[INFO] [stderr]     Checking block-buffer v0.10.4
[INFO] [stderr]     Checking crypto-common v0.1.6
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking sha2 v0.10.7
[INFO] [stderr]     Checking merkle_tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `left` and `right` are never read
[INFO] [stdout]   --> src/main.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct Node {
[INFO] [stdout]    |            ---- fields in this struct
[INFO] [stdout] 14 |     hash: String,
[INFO] [stdout] 15 |     left: Option<Box<Node>>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 16 |     right: Option<Box<Node>>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `left` and `right` are never read
[INFO] [stdout]   --> src/main.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct Node {
[INFO] [stdout]    |            ---- fields in this struct
[INFO] [stdout] 14 |     hash: String,
[INFO] [stdout] 15 |     left: Option<Box<Node>>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 16 |     right: Option<Box<Node>>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.78s
[INFO] running `Command { std: "docker" "inspect" "e1e35b7e64b2697e16617506eb8a6a663a23ad86e7e86533733310f63660caae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1e35b7e64b2697e16617506eb8a6a663a23ad86e7e86533733310f63660caae", kill_on_drop: false }`
[INFO] [stdout] e1e35b7e64b2697e16617506eb8a6a663a23ad86e7e86533733310f63660caae