[INFO] cloning repository https://github.com/angry-architect/checkers
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/angry-architect/checkers" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fangry-architect%2Fcheckers", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fangry-architect%2Fcheckers'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 538dfed2fbdd6db9caa9b7149fd240c3ec7f353a
[INFO] checking angry-architect/checkers against master#c720f49c46ec3e70bbc2bbb3e0dd1fe7fc0a47f2 for pr-142712
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fangry-architect%2Fcheckers" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/angry-architect/checkers
[INFO] finished tweaking git repo https://github.com/angry-architect/checkers
[INFO] tweaked toml for git repo https://github.com/angry-architect/checkers written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/angry-architect/checkers on toolchain c720f49c46ec3e70bbc2bbb3e0dd1fe7fc0a47f2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c720f49c46ec3e70bbc2bbb3e0dd1fe7fc0a47f2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/angry-architect/checkers 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" "+c720f49c46ec3e70bbc2bbb3e0dd1fe7fc0a47f2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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_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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+c720f49c46ec3e70bbc2bbb3e0dd1fe7fc0a47f2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6a6d261aa762a8fe6a7afb9f33e0756fabc391492ac498a6548b0d60086d44a6
[INFO] running `Command { std: "docker" "start" "-a" "6a6d261aa762a8fe6a7afb9f33e0756fabc391492ac498a6548b0d60086d44a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6a6d261aa762a8fe6a7afb9f33e0756fabc391492ac498a6548b0d60086d44a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a6d261aa762a8fe6a7afb9f33e0756fabc391492ac498a6548b0d60086d44a6", kill_on_drop: false }`
[INFO] [stdout] 6a6d261aa762a8fe6a7afb9f33e0756fabc391492ac498a6548b0d60086d44a6
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+c720f49c46ec3e70bbc2bbb3e0dd1fe7fc0a47f2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2e97d229ca162822f7ef8c7af6319c333625cfa0fe9fec2157adef500468821b
[INFO] running `Command { std: "docker" "start" "-a" "2e97d229ca162822f7ef8c7af6319c333625cfa0fe9fec2157adef500468821b", kill_on_drop: false }`
[INFO] [stderr]     Checking checkers v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `kings` is never read
[INFO] [stdout]  --> src/main.rs:7:3
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Board<'a> {
[INFO] [stdout]   |        ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 7 |   kings: u32,
[INFO] [stdout]   |   ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `sub_moves` and `is_attack` are never read
[INFO] [stdout]   --> src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct Move<'a> {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 13 |     sub_moves: Vec<&'a i32>,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 14 |     is_attack: bool
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Move` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]   --> src/main.rs:88:19
[INFO] [stdout]    |
[INFO] [stdout] 88 |     fn parse_move(&self, input: &String) -> Move {
[INFO] [stdout]    |                   ^^^^^                     ---- the lifetime gets resolved as `'_`
[INFO] [stdout]    |                   |
[INFO] [stdout]    |                   this lifetime flows to the output
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]    |
[INFO] [stdout] 88 |     fn parse_move(&self, input: &String) -> Move<'_> {
[INFO] [stdout]    |                                                 ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `kings` is never read
[INFO] [stdout]  --> src/main.rs:7:3
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Board<'a> {
[INFO] [stdout]   |        ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 7 |   kings: u32,
[INFO] [stdout]   |   ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `sub_moves` and `is_attack` are never read
[INFO] [stdout]   --> src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct Move<'a> {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 13 |     sub_moves: Vec<&'a i32>,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 14 |     is_attack: bool
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Move` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]   --> src/main.rs:88:19
[INFO] [stdout]    |
[INFO] [stdout] 88 |     fn parse_move(&self, input: &String) -> Move {
[INFO] [stdout]    |                   ^^^^^                     ---- the lifetime gets resolved as `'_`
[INFO] [stdout]    |                   |
[INFO] [stdout]    |                   this lifetime flows to the output
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]    |
[INFO] [stdout] 88 |     fn parse_move(&self, input: &String) -> Move<'_> {
[INFO] [stdout]    |                                                 ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.25s
[INFO] running `Command { std: "docker" "inspect" "2e97d229ca162822f7ef8c7af6319c333625cfa0fe9fec2157adef500468821b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e97d229ca162822f7ef8c7af6319c333625cfa0fe9fec2157adef500468821b", kill_on_drop: false }`
[INFO] [stdout] 2e97d229ca162822f7ef8c7af6319c333625cfa0fe9fec2157adef500468821b