[INFO] cloning repository https://github.com/jvhellemondt/palindrome.rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jvhellemondt/palindrome.rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjvhellemondt%2Fpalindrome.rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjvhellemondt%2Fpalindrome.rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bd35b7aeed9eee0b5fb95d45b5865645455efd01
[INFO] checking jvhellemondt/palindrome.rs against master#b2728d5426bab1d8c39709768c7e22b7f66dde5d for pr-135852
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjvhellemondt%2Fpalindrome.rs" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jvhellemondt/palindrome.rs on toolchain b2728d5426bab1d8c39709768c7e22b7f66dde5d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b2728d5426bab1d8c39709768c7e22b7f66dde5d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jvhellemondt/palindrome.rs
[INFO] finished tweaking git repo https://github.com/jvhellemondt/palindrome.rs
[INFO] tweaked toml for git repo https://github.com/jvhellemondt/palindrome.rs written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/jvhellemondt/palindrome.rs 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" "+b2728d5426bab1d8c39709768c7e22b7f66dde5d" "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-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+b2728d5426bab1d8c39709768c7e22b7f66dde5d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 95faa27021738d7ae0e96a9eae5f713d7fc3fa9d3f15ea45bc0aad5b63c19223
[INFO] running `Command { std: "docker" "start" "-a" "95faa27021738d7ae0e96a9eae5f713d7fc3fa9d3f15ea45bc0aad5b63c19223", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "95faa27021738d7ae0e96a9eae5f713d7fc3fa9d3f15ea45bc0aad5b63c19223", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "95faa27021738d7ae0e96a9eae5f713d7fc3fa9d3f15ea45bc0aad5b63c19223", kill_on_drop: false }`
[INFO] [stdout] 95faa27021738d7ae0e96a9eae5f713d7fc3fa9d3f15ea45bc0aad5b63c19223
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+b2728d5426bab1d8c39709768c7e22b7f66dde5d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0b291ba8aad038ceac9e35b0b72601b215d5202dc26ebb1f02c8dfeecaa51d4b
[INFO] running `Command { std: "docker" "start" "-a" "0b291ba8aad038ceac9e35b0b72601b215d5202dc26ebb1f02c8dfeecaa51d4b", kill_on_drop: false }`
[INFO] [stderr]     Checking palindrome v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `PalindromeChecker` is never constructed
[INFO] [stdout]  --> src/main.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct PalindromeChecker {}
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `is_a_palindrome` is never used
[INFO] [stdout]  --> src/main.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | impl PalindromeChecker {
[INFO] [stdout]   | ---------------------- associated function in this implementation
[INFO] [stdout] 8 |     fn is_a_palindrome(word: &str) -> bool {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] running `Command { std: "docker" "inspect" "0b291ba8aad038ceac9e35b0b72601b215d5202dc26ebb1f02c8dfeecaa51d4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b291ba8aad038ceac9e35b0b72601b215d5202dc26ebb1f02c8dfeecaa51d4b", kill_on_drop: false }`
[INFO] [stdout] 0b291ba8aad038ceac9e35b0b72601b215d5202dc26ebb1f02c8dfeecaa51d4b