[INFO] updating cached repository https://github.com/AntonZelenin/rust-kvs
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c7ff4b0965e6b8e3963f84689080b5e3f2ffffb0
[INFO] checking AntonZelenin/rust-kvs against master#fdc0011561c6365c596dfd8fa1ef388162bc89c7 for pr-66504-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAntonZelenin%2Frust-kvs" "/workspace/builds/worker-7/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/AntonZelenin/rust-kvs on toolchain fdc0011561c6365c596dfd8fa1ef388162bc89c7
[INFO] running `"/workspace/cargo-home/bin/cargo" "+fdc0011561c6365c596dfd8fa1ef388162bc89c7" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/AntonZelenin/rust-kvs
[INFO] finished tweaking git repo https://github.com/AntonZelenin/rust-kvs
[INFO] tweaked toml for git repo https://github.com/AntonZelenin/rust-kvs written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/AntonZelenin/rust-kvs already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+fdc0011561c6365c596dfd8fa1ef388162bc89c7" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+fdc0011561c6365c596dfd8fa1ef388162bc89c7" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 43495926ee472420d64927f445141bcc1afd4caa4fe383e54843620877b59c61
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "43495926ee472420d64927f445141bcc1afd4caa4fe383e54843620877b59c61"`
[INFO] [stderr]    Compiling regex v1.1.9
[INFO] [stderr]     Checking regex-syntax v0.6.8
[INFO] [stderr]     Checking getrandom v0.1.12
[INFO] [stderr]    Compiling syn v0.15.39
[INFO] [stderr]     Checking num-integer v0.1.41
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking float-cmp v0.4.0
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking chrono v0.4.9
[INFO] [stderr]     Checking rand v0.7.2
[INFO] [stderr]    Compiling num-derive v0.3.0
[INFO] [stderr]     Checking kvs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling serde_derive v1.0.94
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]  --> src/bin/kvs.rs:9:13
[INFO] [stderr]   |
[INFO] [stderr] 9 |         let key = matches.value_of("KEY").unwrap();
[INFO] [stderr]   |             ^^^ help: consider prefixing with an underscore: `_key`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]   --> src/bin/kvs.rs:10:13
[INFO] [stderr]    |
[INFO] [stderr] 10 |         let value = matches.value_of("VALUE").unwrap();
[INFO] [stderr]    |             ^^^^^ help: consider prefixing with an underscore: `_value`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]   --> src/bin/kvs.rs:14:13
[INFO] [stderr]    |
[INFO] [stderr] 14 |         let key = matches.value_of("KEY").unwrap();
[INFO] [stderr]    |             ^^^ help: consider prefixing with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]   --> src/bin/kvs.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |         let key = matches.value_of("KEY").unwrap();
[INFO] [stderr]    |             ^^^ help: consider prefixing with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr]     Checking predicates v1.0.1
[INFO] [stderr]     Checking serde v1.0.101
[INFO] [stderr]     Checking serde_json v1.0.41
[INFO] [stderr]     Checking ron v0.5.1
[INFO] [stderr]     Checking escargot v0.4.0
[INFO] [stderr]     Checking bson v0.14.0
[INFO] [stderr]     Checking assert_cmd v0.11.1
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]  --> src/bin/kvs.rs:9:13
[INFO] [stderr]   |
[INFO] [stderr] 9 |         let key = matches.value_of("KEY").unwrap();
[INFO] [stderr]   |             ^^^ help: consider prefixing with an underscore: `_key`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]   --> src/bin/kvs.rs:10:13
[INFO] [stderr]    |
[INFO] [stderr] 10 |         let value = matches.value_of("VALUE").unwrap();
[INFO] [stderr]    |             ^^^^^ help: consider prefixing with an underscore: `_value`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]   --> src/bin/kvs.rs:14:13
[INFO] [stderr]    |
[INFO] [stderr] 14 |         let key = matches.value_of("KEY").unwrap();
[INFO] [stderr]    |             ^^^ help: consider prefixing with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]   --> src/bin/kvs.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |         let key = matches.value_of("KEY").unwrap();
[INFO] [stderr]    |             ^^^ help: consider prefixing with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> examples/serde.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 |     f.write(&serde_json::to_string(&a).unwrap().as_bytes());
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> examples/serde.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     f.seek(SeekFrom::Start(0));
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> examples/serde.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     f.read_to_string(&mut b);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 58.00s
[INFO] running `"docker" "inspect" "43495926ee472420d64927f445141bcc1afd4caa4fe383e54843620877b59c61"`
[INFO] running `"docker" "rm" "-f" "43495926ee472420d64927f445141bcc1afd4caa4fe383e54843620877b59c61"`
[INFO] [stdout] 43495926ee472420d64927f445141bcc1afd4caa4fe383e54843620877b59c61