[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] testing jvhellemondt/palindrome.rs against try#a7ce54db9b096bd1098d07c645b489195a667c9f for pr-137940
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjvhellemondt%2Fpalindrome.rs" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jvhellemondt/palindrome.rs on toolchain a7ce54db9b096bd1098d07c645b489195a667c9f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a7ce54db9b096bd1098d07c645b489195a667c9f" "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-0-tc2/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" "+a7ce54db9b096bd1098d07c645b489195a667c9f" "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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+a7ce54db9b096bd1098d07c645b489195a667c9f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 94da4ea7e8a324c4ef88478f236b10ef81c7a160655ef43d57829e3862aa5d2c
[INFO] running `Command { std: "docker" "start" "-a" "94da4ea7e8a324c4ef88478f236b10ef81c7a160655ef43d57829e3862aa5d2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "94da4ea7e8a324c4ef88478f236b10ef81c7a160655ef43d57829e3862aa5d2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94da4ea7e8a324c4ef88478f236b10ef81c7a160655ef43d57829e3862aa5d2c", kill_on_drop: false }`
[INFO] [stdout] 94da4ea7e8a324c4ef88478f236b10ef81c7a160655ef43d57829e3862aa5d2c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+a7ce54db9b096bd1098d07c645b489195a667c9f" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8fdd158a755ee6594115fd67d14abcc18f315e602091e57ca66a21ffe8f41203
[INFO] running `Command { std: "docker" "start" "-a" "8fdd158a755ee6594115fd67d14abcc18f315e602091e57ca66a21ffe8f41203", kill_on_drop: false }`
[INFO] [stderr]    Compiling 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 0.16s
[INFO] running `Command { std: "docker" "inspect" "8fdd158a755ee6594115fd67d14abcc18f315e602091e57ca66a21ffe8f41203", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8fdd158a755ee6594115fd67d14abcc18f315e602091e57ca66a21ffe8f41203", kill_on_drop: false }`
[INFO] [stdout] 8fdd158a755ee6594115fd67d14abcc18f315e602091e57ca66a21ffe8f41203
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+a7ce54db9b096bd1098d07c645b489195a667c9f" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8061d4c70d5c85f853300e1195adc5e4ff402962ffcfb40199233ad06cdb26a9
[INFO] running `Command { std: "docker" "start" "-a" "8061d4c70d5c85f853300e1195adc5e4ff402962ffcfb40199233ad06cdb26a9", kill_on_drop: false }`
[INFO] [stderr]    Compiling palindrome v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.31s
[INFO] running `Command { std: "docker" "inspect" "8061d4c70d5c85f853300e1195adc5e4ff402962ffcfb40199233ad06cdb26a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8061d4c70d5c85f853300e1195adc5e4ff402962ffcfb40199233ad06cdb26a9", kill_on_drop: false }`
[INFO] [stdout] 8061d4c70d5c85f853300e1195adc5e4ff402962ffcfb40199233ad06cdb26a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+a7ce54db9b096bd1098d07c645b489195a667c9f" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 44c621d1d46ae815723087080dd0b8fa922ea2636331744a6b937e1dc5c5a870
[INFO] running `Command { std: "docker" "start" "-a" "44c621d1d46ae815723087080dd0b8fa922ea2636331744a6b937e1dc5c5a870", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/palindrome-f196f0960f6d8ed6)
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test tests::it_should_be_able_to_tell_that_bill_is_not_a_palindrome ... ok
[INFO] [stdout] test tests::it_should_be_able_to_tell_that_mom_is_a_palindrome ... ok
[INFO] [stdout] test tests::it_should_be_able_to_tell_that_was_it_a_rat_i_saw_is_a_palindrome ... ok
[INFO] [stdout] test tests::it_should_still_detect_a_palindrome_even_if_the_casing_is_off ... ok
[INFO] [stdout] test tests::it_should_be_able_to_tell_that_never_odd_or_even_is_palindrome ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "44c621d1d46ae815723087080dd0b8fa922ea2636331744a6b937e1dc5c5a870", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44c621d1d46ae815723087080dd0b8fa922ea2636331744a6b937e1dc5c5a870", kill_on_drop: false }`
[INFO] [stdout] 44c621d1d46ae815723087080dd0b8fa922ea2636331744a6b937e1dc5c5a870