[INFO] cloning repository https://github.com/whoisgautxm/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/whoisgautxm/Merkle_Tree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwhoisgautxm%2FMerkle_Tree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwhoisgautxm%2FMerkle_Tree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ed13baf499afdaac036c4384f4e0f0b7bc82702d
[INFO] checking whoisgautxm/Merkle_Tree against try#d534db0721b23cf977073bf4cd306dbf501e6b4d for pr-138499
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwhoisgautxm%2FMerkle_Tree" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/whoisgautxm/Merkle_Tree on toolchain d534db0721b23cf977073bf4cd306dbf501e6b4d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d534db0721b23cf977073bf4cd306dbf501e6b4d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/whoisgautxm/Merkle_Tree
[INFO] finished tweaking git repo https://github.com/whoisgautxm/Merkle_Tree
[INFO] tweaked toml for git repo https://github.com/whoisgautxm/Merkle_Tree written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/whoisgautxm/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" "+d534db0721b23cf977073bf4cd306dbf501e6b4d" "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
[ERROR] error running command: no output for 300 seconds
[INFO] checking whoisgautxm/Merkle_Tree against try#d534db0721b23cf977073bf4cd306dbf501e6b4d for pr-138499
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwhoisgautxm%2FMerkle_Tree" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/whoisgautxm/Merkle_Tree on toolchain d534db0721b23cf977073bf4cd306dbf501e6b4d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d534db0721b23cf977073bf4cd306dbf501e6b4d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/whoisgautxm/Merkle_Tree
[INFO] finished tweaking git repo https://github.com/whoisgautxm/Merkle_Tree
[INFO] tweaked toml for git repo https://github.com/whoisgautxm/Merkle_Tree written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/whoisgautxm/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" "+d534db0721b23cf977073bf4cd306dbf501e6b4d" "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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+d534db0721b23cf977073bf4cd306dbf501e6b4d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0db7b2d98ef653ac859ca3fb372e3299385f31a58df1acd9ae4603e2a3c62e42
[INFO] running `Command { std: "docker" "start" "-a" "0db7b2d98ef653ac859ca3fb372e3299385f31a58df1acd9ae4603e2a3c62e42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0db7b2d98ef653ac859ca3fb372e3299385f31a58df1acd9ae4603e2a3c62e42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0db7b2d98ef653ac859ca3fb372e3299385f31a58df1acd9ae4603e2a3c62e42", kill_on_drop: false }`
[INFO] [stdout] 0db7b2d98ef653ac859ca3fb372e3299385f31a58df1acd9ae4603e2a3c62e42
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+d534db0721b23cf977073bf4cd306dbf501e6b4d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fc24283ad5bdc7f8f2964ff77a273373c05dc158e2163b47787306580b8f2a50
[INFO] running `Command { std: "docker" "start" "-a" "fc24283ad5bdc7f8f2964ff77a273373c05dc158e2163b47787306580b8f2a50", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling proc-macro2 v1.0.85
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]     Checking cpufeatures v0.2.12
[INFO] [stderr]     Checking bytes v1.6.0
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking pin-project-lite v0.2.14
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]     Checking tokio v1.38.0
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stderr]    Compiling syn v2.0.66
[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 sha2 v0.10.8
[INFO] [stderr]    Compiling async-trait v0.1.80
[INFO] [stderr]     Checking sha256 v1.5.0
[INFO] [stderr]     Checking Merkle_Tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0601]: `main` function not found in crate `Merkle_Tree`
[INFO] [stdout]    --> src/main.rs:192:2
[INFO] [stdout]     |
[INFO] [stdout] 192 | }
[INFO] [stdout]     |  ^ consider adding a `main` function to `src/main.rs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]   --> src/main.rs:79:21
[INFO] [stdout]    |
[INFO] [stdout] 79 |                 let len = next_level.len() + 1 ;
[INFO] [stdout]    |                     ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]   --> src/main.rs:79:21
[INFO] [stdout]    |
[INFO] [stdout] 79 |                 let len = next_level.len() + 1 ;
[INFO] [stdout]    |                     ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0601`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `Merkle_Tree` (bin "Merkle_Tree") due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: type `Node` is more private than the item `MerkleTree::root`
[INFO] [stdout]   --> src/main.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 |     pub root: Option<Node>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^ field `MerkleTree::root` is reachable at visibility `pub`
[INFO] [stdout]    |
[INFO] [stdout] note: but type `Node` is only usable at visibility `pub(crate)`
[INFO] [stdout]   --> src/main.rs:7:1
[INFO] [stdout]    |
[INFO] [stdout] 7  | struct Node {
[INFO] [stdout]    | ^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Node` is more private than the item `MerkleTree::traverse`
[INFO] [stdout]    --> src/main.rs:102:5
[INFO] [stdout]     |
[INFO] [stdout] 102 |     pub fn traverse(&self, callback: &mut dyn FnMut(&Node)) {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method `MerkleTree::traverse` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `Node` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/main.rs:7:1
[INFO] [stdout]     |
[INFO] [stdout] 7   | struct Node {
[INFO] [stdout]     | ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "fc24283ad5bdc7f8f2964ff77a273373c05dc158e2163b47787306580b8f2a50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc24283ad5bdc7f8f2964ff77a273373c05dc158e2163b47787306580b8f2a50", kill_on_drop: false }`
[INFO] [stdout] fc24283ad5bdc7f8f2964ff77a273373c05dc158e2163b47787306580b8f2a50