[INFO] cloning repository https://github.com/alhee/book-learn-rust-programming
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/alhee/book-learn-rust-programming" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falhee%2Fbook-learn-rust-programming", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falhee%2Fbook-learn-rust-programming'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 07ad31b168f90dc682f4d5d1bcdbf9788e825b32
[INFO] checking alhee/book-learn-rust-programming against try#8cf44c88fc5805dc578c5c987397615b47d2e2b2 for pr-136764
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falhee%2Fbook-learn-rust-programming" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alhee/book-learn-rust-programming on toolchain 8cf44c88fc5805dc578c5c987397615b47d2e2b2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8cf44c88fc5805dc578c5c987397615b47d2e2b2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/alhee/book-learn-rust-programming
[INFO] finished tweaking git repo https://github.com/alhee/book-learn-rust-programming
[INFO] tweaked toml for git repo https://github.com/alhee/book-learn-rust-programming written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/alhee/book-learn-rust-programming 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" "+8cf44c88fc5805dc578c5c987397615b47d2e2b2" "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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+8cf44c88fc5805dc578c5c987397615b47d2e2b2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 46958b03d16074cb92543be06469f82a439004d7e7489d520f09099e64781a7b
[INFO] running `Command { std: "docker" "start" "-a" "46958b03d16074cb92543be06469f82a439004d7e7489d520f09099e64781a7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "46958b03d16074cb92543be06469f82a439004d7e7489d520f09099e64781a7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46958b03d16074cb92543be06469f82a439004d7e7489d520f09099e64781a7b", kill_on_drop: false }`
[INFO] [stdout] 46958b03d16074cb92543be06469f82a439004d7e7489d520f09099e64781a7b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+8cf44c88fc5805dc578c5c987397615b47d2e2b2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ec617383c2fbb2b46370f3a21845d1a18588f8c2dbad625485397ed597ff72dd
[INFO] running `Command { std: "docker" "start" "-a" "ec617383c2fbb2b46370f3a21845d1a18588f8c2dbad625485397ed597ff72dd", kill_on_drop: false }`
[INFO] [stderr]     Checking book-learn-rust-programming v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `encrypt` is never used
[INFO] [stdout]  --> src/chapter1/section09.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn encrypt(text: &str, shift: i16) -> String {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `encrypt_with_closure` is never used
[INFO] [stdout]   --> src/chapter1/section09.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn encrypt_with_closure(text: &str, shift: i16) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_prime` is never used
[INFO] [stdout]  --> src/chapter1/section10.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn is_prime(n: usize) -> bool {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_primes` is never used
[INFO] [stdout]   --> src/chapter1/section10.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn get_primes(primes: &mut [usize; 100]) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.07s
[INFO] running `Command { std: "docker" "inspect" "ec617383c2fbb2b46370f3a21845d1a18588f8c2dbad625485397ed597ff72dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec617383c2fbb2b46370f3a21845d1a18588f8c2dbad625485397ed597ff72dd", kill_on_drop: false }`
[INFO] [stdout] ec617383c2fbb2b46370f3a21845d1a18588f8c2dbad625485397ed597ff72dd