[INFO] cloning repository https://github.com/czeng18/rust_book
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/czeng18/rust_book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fczeng18%2Frust_book", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fczeng18%2Frust_book'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f700ef85db8730f45b63f0c15664f7c2fd9394ef
[INFO] checking czeng18/rust_book/f700ef85db8730f45b63f0c15664f7c2fd9394ef against try#24cd45d7714ba43afd4b8e62fb677b069b21c4a5 for pr-129543
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fczeng18%2Frust_book" "/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/czeng18/rust_book on toolchain 24cd45d7714ba43afd4b8e62fb677b069b21c4a5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+24cd45d7714ba43afd4b8e62fb677b069b21c4a5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/czeng18/rust_book
[INFO] finished tweaking git repo https://github.com/czeng18/rust_book
[INFO] tweaked toml for git repo https://github.com/czeng18/rust_book written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/czeng18/rust_book 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" "+24cd45d7714ba43afd4b8e62fb677b069b21c4a5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+24cd45d7714ba43afd4b8e62fb677b069b21c4a5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ce61903652435beebe2426033a951a79f66fab8d72b75b7c2eff9a9d9640d078
[INFO] running `Command { std: "docker" "start" "-a" "ce61903652435beebe2426033a951a79f66fab8d72b75b7c2eff9a9d9640d078", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ce61903652435beebe2426033a951a79f66fab8d72b75b7c2eff9a9d9640d078", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce61903652435beebe2426033a951a79f66fab8d72b75b7c2eff9a9d9640d078", kill_on_drop: false }`
[INFO] [stdout] ce61903652435beebe2426033a951a79f66fab8d72b75b7c2eff9a9d9640d078
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+24cd45d7714ba43afd4b8e62fb677b069b21c4a5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0d25cf5d1dfbcf6f0d9bbbe4b349651c6730636df69a1a05fa0bd5fd2d9c26a5
[INFO] running `Command { std: "docker" "start" "-a" "0d25cf5d1dfbcf6f0d9bbbe4b349651c6730636df69a1a05fa0bd5fd2d9c26a5", kill_on_drop: false }`
[INFO] [stderr]     Checking type_state v0.1.0 (/opt/rustwide/workdir/ch17/type_state)
[INFO] [stderr]     Checking rust_shell v0.1.0 (/opt/rustwide/workdir/rust_shell)
[INFO] [stderr]     Checking oo_state v0.1.0 (/opt/rustwide/workdir/ch17/oo_state)
[INFO] [stderr]     Checking ch20 v0.1.0 (/opt/rustwide/workdir/ch20)
[INFO] [stderr]     Checking ch12 v0.1.0 (/opt/rustwide/workdir/ch12)
[INFO] [stderr]     Checking ch8 v0.1.0 (/opt/rustwide/workdir/ch8)
[INFO] [stdout] warning: unused variable: `size`
[INFO] [stdout]   --> ch20/lib.rs:36:18
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub fn build(size: usize) -> Result<ThreadPool, PoolCreationError> {
[INFO] [stdout]    |                  ^^^^ help: if this is intentional, prefix it with an underscore: `_size`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]   --> ch17/oo_state/lib.rs:55:27
[INFO] [stdout]    |
[INFO] [stdout] 55 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `text`
[INFO] [stdout]   --> ch17/oo_state/lib.rs:59:28
[INFO] [stdout]    |
[INFO] [stdout] 59 |     fn add_text<'a>(&self, text: &'a str) -> &'a str {
[INFO] [stdout]    |                            ^^^^ help: if this is intentional, prefix it with an underscore: `_text`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]   --> ch17/oo_state/lib.rs:55:27
[INFO] [stdout]    |
[INFO] [stdout] 55 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `text`
[INFO] [stdout]   --> ch17/oo_state/lib.rs:59:28
[INFO] [stdout]    |
[INFO] [stdout] 59 |     fn add_text<'a>(&self, text: &'a str) -> &'a str {
[INFO] [stdout]    |                            ^^^^ help: if this is intentional, prefix it with an underscore: `_text`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `size`
[INFO] [stdout]   --> ch20/lib.rs:36:18
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub fn build(size: usize) -> Result<ThreadPool, PoolCreationError> {
[INFO] [stdout]    |                  ^^^^ help: if this is intentional, prefix it with an underscore: `_size`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` 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 0.62s
[INFO] running `Command { std: "docker" "inspect" "0d25cf5d1dfbcf6f0d9bbbe4b349651c6730636df69a1a05fa0bd5fd2d9c26a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d25cf5d1dfbcf6f0d9bbbe4b349651c6730636df69a1a05fa0bd5fd2d9c26a5", kill_on_drop: false }`
[INFO] [stdout] 0d25cf5d1dfbcf6f0d9bbbe4b349651c6730636df69a1a05fa0bd5fd2d9c26a5