[INFO] cloning repository https://github.com/PhilipDaniels/projecteuler
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/PhilipDaniels/projecteuler" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPhilipDaniels%2Fprojecteuler", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPhilipDaniels%2Fprojecteuler'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 32960482901579f6c3af5ba18865db39eb6c62b9
[INFO] testing PhilipDaniels/projecteuler against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPhilipDaniels%2Fprojecteuler" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/PhilipDaniels/projecteuler on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/PhilipDaniels/projecteuler
[INFO] finished tweaking git repo https://github.com/PhilipDaniels/projecteuler
[INFO] tweaked toml for git repo https://github.com/PhilipDaniels/projecteuler written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/PhilipDaniels/projecteuler already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3fa23a73909ed157811da615330a50a9d2e4f0aeffff6d9c748f4332d9056124
[INFO] running `Command { std: "docker" "start" "-a" "3fa23a73909ed157811da615330a50a9d2e4f0aeffff6d9c748f4332d9056124", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3fa23a73909ed157811da615330a50a9d2e4f0aeffff6d9c748f4332d9056124", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fa23a73909ed157811da615330a50a9d2e4f0aeffff6d9c748f4332d9056124", kill_on_drop: false }`
[INFO] [stdout] 3fa23a73909ed157811da615330a50a9d2e4f0aeffff6d9c748f4332d9056124
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 14d874a8407e862adc2d2a011fbc663a82c0afe5ec9ea8e9243cb2cd222b7243
[INFO] running `Command { std: "docker" "start" "-a" "14d874a8407e862adc2d2a011fbc663a82c0afe5ec9ea8e9243cb2cd222b7243", kill_on_drop: false }`
[INFO] [stderr]    Compiling either v1.5.0
[INFO] [stderr]    Compiling elapsed v0.1.2
[INFO] [stderr]    Compiling itertools v0.7.8
[INFO] [stderr]    Compiling projecteuler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/calc.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 76 |         let mut x = n;
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/calc.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let mut exponent = 1;
[INFO] [stdout]    |             ----^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/p011_to_p020.rs:379:13
[INFO] [stdout]     |
[INFO] [stdout] 379 |         let mut d = column_sum;
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.11s
[INFO] running `Command { std: "docker" "inspect" "14d874a8407e862adc2d2a011fbc663a82c0afe5ec9ea8e9243cb2cd222b7243", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14d874a8407e862adc2d2a011fbc663a82c0afe5ec9ea8e9243cb2cd222b7243", kill_on_drop: false }`
[INFO] [stdout] 14d874a8407e862adc2d2a011fbc663a82c0afe5ec9ea8e9243cb2cd222b7243
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9198bf4a39a429aa8f86682052296fa590a44020e7e5a8521807e95d419a3709
[INFO] running `Command { std: "docker" "start" "-a" "9198bf4a39a429aa8f86682052296fa590a44020e7e5a8521807e95d419a3709", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling projecteuler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/calc.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 76 |         let mut x = n;
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/calc.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let mut exponent = 1;
[INFO] [stdout]    |             ----^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/p011_to_p020.rs:379:13
[INFO] [stdout]     |
[INFO] [stdout] 379 |         let mut d = column_sum;
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.52s
[INFO] running `Command { std: "docker" "inspect" "9198bf4a39a429aa8f86682052296fa590a44020e7e5a8521807e95d419a3709", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9198bf4a39a429aa8f86682052296fa590a44020e7e5a8521807e95d419a3709", kill_on_drop: false }`
[INFO] [stdout] 9198bf4a39a429aa8f86682052296fa590a44020e7e5a8521807e95d419a3709
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 7aa74466970dca6c1bc32e69eae0b7f41c70cbb46d1bafb0ecfb04380bf45cea
[INFO] running `Command { std: "docker" "start" "-a" "7aa74466970dca6c1bc32e69eae0b7f41c70cbb46d1bafb0ecfb04380bf45cea", kill_on_drop: false }`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/calc.rs:76:13
[INFO] [stderr]    |
[INFO] [stderr] 76 |         let mut x = n;
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/calc.rs:77:13
[INFO] [stderr]    |
[INFO] [stderr] 77 |         let mut exponent = 1;
[INFO] [stderr]    |             ----^^^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/p011_to_p020.rs:379:13
[INFO] [stderr]     |
[INFO] [stderr] 379 |         let mut d = column_sum;
[INFO] [stderr]     |             ----^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: `projecteuler` (bin "projecteuler" test) generated 3 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/projecteuler-9aad6c682d868c33)
[INFO] [stdout] 
[INFO] [stdout] running 23 tests
[INFO] [stdout] test fibonacci::tests::fib_in_range_for_start_at_zero_returns_first_fibs ... ok
[INFO] [stdout] test iterator_adapters::tests::in_range_works ... ok
[INFO] [stdout] test calc::tests::triangle_works ... ok
[INFO] [stdout] test matrix::tests::from_str_for_empty_string_returns_empty_matrix ... ok
[INFO] [stdout] test matrix::tests::from_str_for_string_containing_different_numbers_of_cols_returns_err ... ok
[INFO] [stdout] test fibonacci::tests::fib_in_range_for_start_at_nonzero_returns_correct_fibs ... ok
[INFO] [stdout] test fibonacci::tests::fib_in_range_for_empty_range_returns_empty_vec ... ok
[INFO] [stdout] test calc::tests::sqrt_ceil_works ... ok
[INFO] [stdout] test calc::tests::gcd_works ... ok
[INFO] [stdout] test calc::tests::sqrt_upper_bound_works ... ok
[INFO] [stdout] test calc::tests::vec_to_num_works ... ok
[INFO] [stdout] test calc::tests::collatz_len_works ... ok
[INFO] [stdout] test utils::tests::is_palindrome_vec_for_slices_which_are_not_palindromes_returns_false ... ok
[INFO] [stdout] test utils::tests::is_palindrome_vec_for_empty_slice_returns_true ... ok
[INFO] [stdout] test matrix::tests::from_str_for_two_dimensional_string_returns_correct_vector ... ok
[INFO] [stdout] test matrix::tests::from_str_for_string_containing_non_numbers_returns_err ... ok
[INFO] [stdout] test matrix::tests::from_str_for_one_dimensional_string_returns_correct_vector ... ok
[INFO] [stdout] test utils::tests::is_palindrome_for_slices_which_are_palindromes_returns_true ... ok
[INFO] [stdout] test calc::tests::divisors_works ... ok
[INFO] [stdout] test prime::tests::primes_in_range_for_start_at_nonzero_returns_correct_primes ... ok
[INFO] [stdout] test prime::tests::primes_in_range_for_empty_range_returns_empty_vec ... ok
[INFO] [stdout] test utils::tests::is_palindrome_for_singleton_slice_returns_true ... ok
[INFO] [stdout] test prime::tests::primes_in_range_for_start_at_zero_returns_first_primes ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 23 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "7aa74466970dca6c1bc32e69eae0b7f41c70cbb46d1bafb0ecfb04380bf45cea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7aa74466970dca6c1bc32e69eae0b7f41c70cbb46d1bafb0ecfb04380bf45cea", kill_on_drop: false }`
[INFO] [stdout] 7aa74466970dca6c1bc32e69eae0b7f41c70cbb46d1bafb0ecfb04380bf45cea