[INFO] cloning repository https://github.com/AllenShi/rust_playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/AllenShi/rust_playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAllenShi%2Frust_playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAllenShi%2Frust_playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 24a8f729bf3ff9f478679b27f53960d09d4df205
[INFO] testing AllenShi/rust_playground against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAllenShi%2Frust_playground" "/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/AllenShi/rust_playground on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/AllenShi/rust_playground
[INFO] finished tweaking git repo https://github.com/AllenShi/rust_playground
[INFO] tweaked toml for git repo https://github.com/AllenShi/rust_playground written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/AllenShi/rust_playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3cd5f4bf0f6853fdb9003f8962c8b5d2f9f845ac6ca74fc8941a0a489de1204a
[INFO] running `Command { std: "docker" "start" "-a" "3cd5f4bf0f6853fdb9003f8962c8b5d2f9f845ac6ca74fc8941a0a489de1204a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3cd5f4bf0f6853fdb9003f8962c8b5d2f9f845ac6ca74fc8941a0a489de1204a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3cd5f4bf0f6853fdb9003f8962c8b5d2f9f845ac6ca74fc8941a0a489de1204a", kill_on_drop: false }`
[INFO] [stdout] 3cd5f4bf0f6853fdb9003f8962c8b5d2f9f845ac6ca74fc8941a0a489de1204a
[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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f00fab61f2fae8d6f4f5ed77c72906175ce1029e1ca61a0b1720625e63c1c2f8
[INFO] running `Command { std: "docker" "start" "-a" "f00fab61f2fae8d6f4f5ed77c72906175ce1029e1ca61a0b1720625e63c1c2f8", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rust_playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]  --> src/util/conversionexam.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     value: i32
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `User`
[INFO] [stdout]  --> src/util/structexam.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `build_user_style_1`
[INFO] [stdout]  --> src/util/structexam.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn build_user_style_1(email: String, username: String) -> User {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `build_user_style_2`
[INFO] [stdout]   --> src/util/structexam.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn build_user_style_2(email: String, username: String) -> User {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.88s
[INFO] running `Command { std: "docker" "inspect" "f00fab61f2fae8d6f4f5ed77c72906175ce1029e1ca61a0b1720625e63c1c2f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f00fab61f2fae8d6f4f5ed77c72906175ce1029e1ca61a0b1720625e63c1c2f8", kill_on_drop: false }`
[INFO] [stdout] f00fab61f2fae8d6f4f5ed77c72906175ce1029e1ca61a0b1720625e63c1c2f8
[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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8a3284fd83bf7cfac59e84f1749da046d0fea72c6c03e21f6d6a7ac339f00adc
[INFO] running `Command { std: "docker" "start" "-a" "8a3284fd83bf7cfac59e84f1749da046d0fea72c6c03e21f6d6a7ac339f00adc", kill_on_drop: false }`
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]  --> src/util/conversionexam.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     value: i32
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rust_playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct is never constructed: `User`
[INFO] [stdout]  --> src/util/structexam.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `build_user_style_1`
[INFO] [stdout]  --> src/util/structexam.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn build_user_style_1(email: String, username: String) -> User {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `build_user_style_2`
[INFO] [stdout]   --> src/util/structexam.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn build_user_style_2(email: String, username: String) -> User {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `another_value`
[INFO] [stdout]   --> src/util/stringexam.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |         let another_value = my_value;
[INFO] [stdout]    |             ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_another_value`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]  --> src/util/conversionexam.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     value: i32
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]  --> src/util/structexam.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     sign_in_count: u64,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]  --> src/util/structexam.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     active: bool
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `Command { std: "docker" "inspect" "8a3284fd83bf7cfac59e84f1749da046d0fea72c6c03e21f6d6a7ac339f00adc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a3284fd83bf7cfac59e84f1749da046d0fea72c6c03e21f6d6a7ac339f00adc", kill_on_drop: false }`
[INFO] [stdout] 8a3284fd83bf7cfac59e84f1749da046d0fea72c6c03e21f6d6a7ac339f00adc
[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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 90e87d37529ff6823dbd1f168ebc2806795f84d6a3fd1ed2bb4cd5fa53b034ec
[INFO] running `Command { std: "docker" "start" "-a" "90e87d37529ff6823dbd1f168ebc2806795f84d6a3fd1ed2bb4cd5fa53b034ec", kill_on_drop: false }`
[INFO] [stderr] warning: field is never read: `value`
[INFO] [stderr]  --> src/util/conversionexam.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     value: i32
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `User`
[INFO] [stderr]  --> src/util/structexam.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct User {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `build_user_style_1`
[INFO] [stderr]  --> src/util/structexam.rs:9:8
[INFO] [stderr]   |
[INFO] [stderr] 9 |     fn build_user_style_1(email: String, username: String) -> User {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `build_user_style_2`
[INFO] [stderr]   --> src/util/structexam.rs:18:8
[INFO] [stderr]    |
[INFO] [stderr] 18 |     fn build_user_style_2(email: String, username: String) -> User {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_playground` (lib) generated 4 warnings
[INFO] [stderr] warning: unused variable: `another_value`
[INFO] [stderr]   --> src/util/stringexam.rs:49:13
[INFO] [stderr]    |
[INFO] [stderr] 49 |         let another_value = my_value;
[INFO] [stderr]    |             ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_another_value`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `sign_in_count`
[INFO] [stderr]  --> src/util/structexam.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     sign_in_count: u64,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `active`
[INFO] [stderr]  --> src/util/structexam.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     active: bool
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_playground` (lib test) generated 4 warnings (1 duplicate)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_playground-893f3d161efb9223)
[INFO] [stdout] 
[INFO] [stdout] running 8 tests
[INFO] [stdout] test util::cellexam_test::compare_owner_and_reference ... ok
[INFO] [stdout] test util::cellexam_test::unit_test_house ... ok
[INFO] [stdout] test util::conversionexam_test::unit_test_number ... ok
[INFO] [stdout] test util::structexam::tests::test_build_user_style_1 ... ok
[INFO] [stdout] test util::stringexam::tests::unit_test_string_and_str ... ok
[INFO] [stdout] test util::stringexam::tests::unit_test_string_assignment ... ok
[INFO] [stdout] test util::structexam::tests::test_build_user_style_2 ... ok
[INFO] [stdout] test util::structexam::tests::test_new_user ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 8 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_playground-74da7555bb45a643)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running tests/integration_test.rs (/opt/rustwide/target/debug/deps/integration_test-6eb9bc6471e75c31)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test int_test_house_with_cell ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests rust_playground
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "90e87d37529ff6823dbd1f168ebc2806795f84d6a3fd1ed2bb4cd5fa53b034ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90e87d37529ff6823dbd1f168ebc2806795f84d6a3fd1ed2bb4cd5fa53b034ec", kill_on_drop: false }`
[INFO] [stdout] 90e87d37529ff6823dbd1f168ebc2806795f84d6a3fd1ed2bb4cd5fa53b034ec