[INFO] cloning repository https://github.com/Berteun/rust-toy-list
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Berteun/rust-toy-list" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBerteun%2Frust-toy-list", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBerteun%2Frust-toy-list'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8c02b9732a93b89c6528d053069dafac7f7b6bfe
[INFO] checking Berteun/rust-toy-list/8c02b9732a93b89c6528d053069dafac7f7b6bfe against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBerteun%2Frust-toy-list" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Berteun/rust-toy-list on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Berteun/rust-toy-list
[INFO] finished tweaking git repo https://github.com/Berteun/rust-toy-list
[INFO] tweaked toml for git repo https://github.com/Berteun/rust-toy-list written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Berteun/rust-toy-list 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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d37cc0cd4969d13166a28bf4821d6952f08dd59aac8fb7bfe4888767b964a5a7
[INFO] running `Command { std: "docker" "start" "-a" "d37cc0cd4969d13166a28bf4821d6952f08dd59aac8fb7bfe4888767b964a5a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d37cc0cd4969d13166a28bf4821d6952f08dd59aac8fb7bfe4888767b964a5a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d37cc0cd4969d13166a28bf4821d6952f08dd59aac8fb7bfe4888767b964a5a7", kill_on_drop: false }`
[INFO] [stdout] d37cc0cd4969d13166a28bf4821d6952f08dd59aac8fb7bfe4888767b964a5a7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ca189ce74a6babaa52ba4772587f005eb055445eeffe1f96aeb91c67ca01f2ac
[INFO] running `Command { std: "docker" "start" "-a" "ca189ce74a6babaa52ba4772587f005eb055445eeffe1f96aeb91c67ca01f2ac", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr]     Checking reverse v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: type `Node<T>` is more private than the item `List::<T>::first`
[INFO] [stdout]   --> src/list/mod.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 65 |     pub fn first(&self) -> Option<&Node<T>>
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method `List::<T>::first` is reachable at visibility `pub(crate)`
[INFO] [stdout]    |
[INFO] [stdout] note: but type `Node<T>` is only usable at visibility `pub(self)`
[INFO] [stdout]   --> src/list/mod.rs:4:1
[INFO] [stdout]    |
[INFO] [stdout] 4  | struct Node<T> {
[INFO] [stdout]    | ^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Node<T>` is more private than the item `List::<T>::last`
[INFO] [stdout]   --> src/list/mod.rs:74:5
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn last(&self) -> Option<&Node<T>>
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method `List::<T>::last` is reachable at visibility `pub(crate)`
[INFO] [stdout]    |
[INFO] [stdout] note: but type `Node<T>` is only usable at visibility `pub(self)`
[INFO] [stdout]   --> src/list/mod.rs:4:1
[INFO] [stdout]    |
[INFO] [stdout] 4  | struct Node<T> {
[INFO] [stdout]    | ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/list/mod.rs:110:9
[INFO] [stdout]     |
[INFO] [stdout] 110 |         mem::replace(self, new_list);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 110 |         let _ = mem::replace(self, new_list);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Node<T>` is more private than the item `List::<T>::first`
[INFO] [stdout]   --> src/list/mod.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 65 |     pub fn first(&self) -> Option<&Node<T>>
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method `List::<T>::first` is reachable at visibility `pub(crate)`
[INFO] [stdout]    |
[INFO] [stdout] note: but type `Node<T>` is only usable at visibility `pub(self)`
[INFO] [stdout]   --> src/list/mod.rs:4:1
[INFO] [stdout]    |
[INFO] [stdout] 4  | struct Node<T> {
[INFO] [stdout]    | ^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Node<T>` is more private than the item `List::<T>::last`
[INFO] [stdout]   --> src/list/mod.rs:74:5
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn last(&self) -> Option<&Node<T>>
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method `List::<T>::last` is reachable at visibility `pub(crate)`
[INFO] [stdout]    |
[INFO] [stdout] note: but type `Node<T>` is only usable at visibility `pub(self)`
[INFO] [stdout]   --> src/list/mod.rs:4:1
[INFO] [stdout]    |
[INFO] [stdout] 4  | struct Node<T> {
[INFO] [stdout]    | ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/list/mod.rs:110:9
[INFO] [stdout]     |
[INFO] [stdout] 110 |         mem::replace(self, new_list);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 110 |         let _ = mem::replace(self, new_list);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.20s
[INFO] running `Command { std: "docker" "inspect" "ca189ce74a6babaa52ba4772587f005eb055445eeffe1f96aeb91c67ca01f2ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca189ce74a6babaa52ba4772587f005eb055445eeffe1f96aeb91c67ca01f2ac", kill_on_drop: false }`
[INFO] [stdout] ca189ce74a6babaa52ba4772587f005eb055445eeffe1f96aeb91c67ca01f2ac