[INFO] fetching crate palindromeda 2.1.0...
[INFO] testing palindromeda-2.1.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate palindromeda 2.1.0 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate palindromeda 2.1.0
[INFO] finished tweaking crates.io crate palindromeda 2.1.0
[INFO] tweaked toml for crates.io crate palindromeda 2.1.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate palindromeda 2.1.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate palindromeda 2.1.0 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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded forward_ref v1.0.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dabf5d87d4f3c20754c4a65ef5962a42c01c2464e2063698db4e23e955749092
[INFO] running `Command { std: "docker" "start" "-a" "dabf5d87d4f3c20754c4a65ef5962a42c01c2464e2063698db4e23e955749092", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dabf5d87d4f3c20754c4a65ef5962a42c01c2464e2063698db4e23e955749092", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dabf5d87d4f3c20754c4a65ef5962a42c01c2464e2063698db4e23e955749092", kill_on_drop: false }`
[INFO] [stdout] dabf5d87d4f3c20754c4a65ef5962a42c01c2464e2063698db4e23e955749092
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3a339a3510462312e99b9328dcf0e057d52c3d05ebd8117dfbb3f2cb21711a0f
[INFO] running `Command { std: "docker" "start" "-a" "3a339a3510462312e99b9328dcf0e057d52c3d05ebd8117dfbb3f2cb21711a0f", kill_on_drop: false }`
[INFO] [stderr]    Compiling forward_ref v1.0.0
[INFO] [stderr]    Compiling palindromeda v2.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function `from` is never used
[INFO] [stdout]   --> src/lib.rs:87:14
[INFO] [stdout]    |
[INFO] [stdout] 82 | impl PalindromeDigits {
[INFO] [stdout]    | --------------------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 87 |     const fn from(mut x: u64) -> Self {
[INFO] [stdout]    |              ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.47s
[INFO] running `Command { std: "docker" "inspect" "3a339a3510462312e99b9328dcf0e057d52c3d05ebd8117dfbb3f2cb21711a0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a339a3510462312e99b9328dcf0e057d52c3d05ebd8117dfbb3f2cb21711a0f", kill_on_drop: false }`
[INFO] [stdout] 3a339a3510462312e99b9328dcf0e057d52c3d05ebd8117dfbb3f2cb21711a0f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 77778d5058ead3094359a3ca956c93e6c4e901dad7deabc10de0a4cbc9a667a8
[INFO] running `Command { std: "docker" "start" "-a" "77778d5058ead3094359a3ca956c93e6c4e901dad7deabc10de0a4cbc9a667a8", kill_on_drop: false }`
[INFO] [stderr]    Compiling palindromeda v2.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function `from` is never used
[INFO] [stdout]   --> src/lib.rs:87:14
[INFO] [stdout]    |
[INFO] [stdout] 82 | impl PalindromeDigits {
[INFO] [stdout]    | --------------------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 87 |     const fn from(mut x: u64) -> Self {
[INFO] [stdout]    |              ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.75s
[INFO] running `Command { std: "docker" "inspect" "77778d5058ead3094359a3ca956c93e6c4e901dad7deabc10de0a4cbc9a667a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77778d5058ead3094359a3ca956c93e6c4e901dad7deabc10de0a4cbc9a667a8", kill_on_drop: false }`
[INFO] [stdout] 77778d5058ead3094359a3ca956c93e6c4e901dad7deabc10de0a4cbc9a667a8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 1e77d6e369ccd65057af46a393b03a8faf69d19e0b3de862a26d7839bafdaff9
[INFO] running `Command { std: "docker" "start" "-a" "1e77d6e369ccd65057af46a393b03a8faf69d19e0b3de862a26d7839bafdaff9", kill_on_drop: false }`
[INFO] [stderr] warning: associated function `from` is never used
[INFO] [stderr]   --> src/lib.rs:87:14
[INFO] [stderr]    |
[INFO] [stderr] 82 | impl PalindromeDigits {
[INFO] [stderr]    | --------------------- associated function in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 87 |     const fn from(mut x: u64) -> Self {
[INFO] [stderr]    |              ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `palindromeda` (lib) generated 1 warning
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/palindromeda-8a97a52f56012230)
[INFO] [stdout] 
[INFO] [stdout] running 14 tests
[INFO] [stdout] test tests::test_palindrome_construct ... ok
[INFO] [stdout] test tests::test_palindrome_ge ... ok
[INFO] [stdout] test tests::test_palindrome_le ... ok
[INFO] [stdout] test tests::test_palindrome_previous ... ok
[INFO] [stdout] test tests::test_palindrome_next ... ok
[INFO] [stdout] test tests::test_palindromeiter_first_n_palindromes ... ok
[INFO] [stdout] test tests::test_palindrome_closest ... ok
[INFO] [stdout] test tests::test_palindromeiter_iterate_rev ... ok
[INFO] [stdout] test tests::test_palindromeiter_first_n_palindromes_from ... ok
[INFO] [stdout] test tests::test_palindromeiter_len ... ok
[INFO] [stdout] test tests::test_palindromeiter_iterate ... ok
[INFO] [stdout] test tests::test_palindrome_construct_panic_on_too_big_length - should panic ... ok
[INFO] [stdout] test tests::test_palindrome_construct_panic_on_too_short_length - should panic ... ok
[INFO] [stdout] test tests::test_palindrome_nth ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 14 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.17s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests palindromeda
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test src/lib.rs - (line 28) ... ok
[INFO] [stdout] test src/lib.rs - (line 8) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.34s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "1e77d6e369ccd65057af46a393b03a8faf69d19e0b3de862a26d7839bafdaff9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e77d6e369ccd65057af46a393b03a8faf69d19e0b3de862a26d7839bafdaff9", kill_on_drop: false }`
[INFO] [stdout] 1e77d6e369ccd65057af46a393b03a8faf69d19e0b3de862a26d7839bafdaff9