[INFO] cloning repository https://github.com/Shivannsh/merkle-tree-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Shivannsh/merkle-tree-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FShivannsh%2Fmerkle-tree-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FShivannsh%2Fmerkle-tree-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3d190aaca2729c07d72596b5699c960e14d8f8c8
[INFO] checking Shivannsh/merkle-tree-rust against try#de39175d9e0f63ff8967b81f9639ba28d11ae6ef for pr-135331
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FShivannsh%2Fmerkle-tree-rust" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Shivannsh/merkle-tree-rust on toolchain de39175d9e0f63ff8967b81f9639ba28d11ae6ef
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+de39175d9e0f63ff8967b81f9639ba28d11ae6ef" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Shivannsh/merkle-tree-rust
[INFO] finished tweaking git repo https://github.com/Shivannsh/merkle-tree-rust
[INFO] tweaked toml for git repo https://github.com/Shivannsh/merkle-tree-rust written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Shivannsh/merkle-tree-rust 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" "+de39175d9e0f63ff8967b81f9639ba28d11ae6ef" "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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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" "+de39175d9e0f63ff8967b81f9639ba28d11ae6ef" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e7abb0c700ab852383e98c72ba5cd67ca969cb6b6670f305bff944ace63e597d
[INFO] running `Command { std: "docker" "start" "-a" "e7abb0c700ab852383e98c72ba5cd67ca969cb6b6670f305bff944ace63e597d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e7abb0c700ab852383e98c72ba5cd67ca969cb6b6670f305bff944ace63e597d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7abb0c700ab852383e98c72ba5cd67ca969cb6b6670f305bff944ace63e597d", kill_on_drop: false }`
[INFO] [stdout] e7abb0c700ab852383e98c72ba5cd67ca969cb6b6670f305bff944ace63e597d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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" "+de39175d9e0f63ff8967b81f9639ba28d11ae6ef" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 28ecfe0de664b29daf459557134ab52b97a06c9e258d1600304a6b64ad48249a
[INFO] running `Command { std: "docker" "start" "-a" "28ecfe0de664b29daf459557134ab52b97a06c9e258d1600304a6b64ad48249a", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]     Checking cpufeatures v0.2.12
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]    Compiling generic-array v0.14.7
[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]     Checking merkle-tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]   --> src/main.rs:82:21
[INFO] [stdout]    |
[INFO] [stdout] 82 |                 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:82:21
[INFO] [stdout]    |
[INFO] [stdout] 82 |                 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: type `Node` is more private than the item `MerkleTree::root`
[INFO] [stdout]   --> src/main.rs:49:5
[INFO] [stdout]    |
[INFO] [stdout] 49 |     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:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | 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:105:5
[INFO] [stdout]     |
[INFO] [stdout] 105 |     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:10:1
[INFO] [stdout]     |
[INFO] [stdout] 10  | struct Node {
[INFO] [stdout]     | ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Node` is more private than the item `MerkleTree::root`
[INFO] [stdout]   --> src/main.rs:49:5
[INFO] [stdout]    |
[INFO] [stdout] 49 |     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:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | 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:105:5
[INFO] [stdout]     |
[INFO] [stdout] 105 |     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:10:1
[INFO] [stdout]     |
[INFO] [stdout] 10  | struct Node {
[INFO] [stdout]     | ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.19s
[INFO] running `Command { std: "docker" "inspect" "28ecfe0de664b29daf459557134ab52b97a06c9e258d1600304a6b64ad48249a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "28ecfe0de664b29daf459557134ab52b97a06c9e258d1600304a6b64ad48249a", kill_on_drop: false }`
[INFO] [stdout] 28ecfe0de664b29daf459557134ab52b97a06c9e258d1600304a6b64ad48249a