[INFO] fetching crate consistent-rs 0.1.1...
[INFO] checking consistent-rs-0.1.1 against try#5c7108a2805ef56743d713d2789c5e802631c9e8 for pr-97739
[INFO] extracting crate consistent-rs 0.1.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate consistent-rs 0.1.1 on toolchain 5c7108a2805ef56743d713d2789c5e802631c9e8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5c7108a2805ef56743d713d2789c5e802631c9e8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate consistent-rs 0.1.1
[INFO] finished tweaking crates.io crate consistent-rs 0.1.1
[INFO] tweaked toml for crates.io crate consistent-rs 0.1.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5c7108a2805ef56743d713d2789c5e802631c9e8" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5c7108a2805ef56743d713d2789c5e802631c9e8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:ac0d0aa6ec8ed129e241004a6179c99fa0d2616f50ba759c5b60bd26d0fafa02" "/opt/rustwide/cargo-home/bin/cargo" "+5c7108a2805ef56743d713d2789c5e802631c9e8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ed8dd343fed575f6c6005ca84ecfe6d0cd07c4192079831026ec57b8da43880e
[INFO] running `Command { std: "docker" "start" "-a" "ed8dd343fed575f6c6005ca84ecfe6d0cd07c4192079831026ec57b8da43880e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ed8dd343fed575f6c6005ca84ecfe6d0cd07c4192079831026ec57b8da43880e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed8dd343fed575f6c6005ca84ecfe6d0cd07c4192079831026ec57b8da43880e", kill_on_drop: false }`
[INFO] [stdout] ed8dd343fed575f6c6005ca84ecfe6d0cd07c4192079831026ec57b8da43880e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "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:ac0d0aa6ec8ed129e241004a6179c99fa0d2616f50ba759c5b60bd26d0fafa02" "/opt/rustwide/cargo-home/bin/cargo" "+5c7108a2805ef56743d713d2789c5e802631c9e8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d6e5270d205a373fdd21eabcffd0ed21ba54369e7f7f8551aec2c9599de26464
[INFO] running `Command { std: "docker" "start" "-a" "d6e5270d205a373fdd21eabcffd0ed21ba54369e7f7f8551aec2c9599de26464", kill_on_drop: false }`
[INFO] [stderr]    Compiling build_const v0.2.2
[INFO] [stderr]    Compiling crc v1.8.1
[INFO] [stderr]     Checking consistent-rs v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/consistant.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |         let _ = self.lock.read().expect("rLock");
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(let_underscore_lock)]` on by default
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 45 |         let _unused = self.lock.read().expect("rLock");
[INFO] [stdout]    |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 45 |         drop(self.lock.read().expect("rLock"));
[INFO] [stdout]    |         ~~~~~                                +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/consistant.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let _ = self.lock.write().expect("wLock");
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let _unused = self.lock.write().expect("wLock");
[INFO] [stdout]    |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 51 |         drop(self.lock.write().expect("wLock"));
[INFO] [stdout]    |         ~~~~~                                 +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/consistant.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |         let _ = self.lock.read().expect("rLock");
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 69 |         let _unused = self.lock.read().expect("rLock");
[INFO] [stdout]    |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 69 |         drop(self.lock.read().expect("rLock"));
[INFO] [stdout]    |         ~~~~~                                +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/consistant.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |         let _ = self.lock.read().expect("rLock");
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 80 |         let _unused = self.lock.read().expect("rLock");
[INFO] [stdout]    |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 80 |         drop(self.lock.read().expect("rLock"));
[INFO] [stdout]    |         ~~~~~                                +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/consistant.rs:111:9
[INFO] [stdout]     |
[INFO] [stdout] 111 |         let _ = self.lock.write().expect("wLock");
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 111 |         let _unused = self.lock.write().expect("wLock");
[INFO] [stdout]     |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 111 |         drop(self.lock.write().expect("wLock"));
[INFO] [stdout]     |         ~~~~~                                 +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `consistent-rs` due to 6 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/consistant.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |         let _ = self.lock.read().expect("rLock");
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(let_underscore_lock)]` on by default
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 45 |         let _unused = self.lock.read().expect("rLock");
[INFO] [stdout]    |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 45 |         drop(self.lock.read().expect("rLock"));
[INFO] [stdout]    |         ~~~~~                                +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/consistant.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let _ = self.lock.write().expect("wLock");
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let _unused = self.lock.write().expect("wLock");
[INFO] [stdout]    |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 51 |         drop(self.lock.write().expect("wLock"));
[INFO] [stdout]    |         ~~~~~                                 +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/consistant.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |         let _ = self.lock.read().expect("rLock");
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 69 |         let _unused = self.lock.read().expect("rLock");
[INFO] [stdout]    |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 69 |         drop(self.lock.read().expect("rLock"));
[INFO] [stdout]    |         ~~~~~                                +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/consistant.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |         let _ = self.lock.read().expect("rLock");
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 80 |         let _unused = self.lock.read().expect("rLock");
[INFO] [stdout]    |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 80 |         drop(self.lock.read().expect("rLock"));
[INFO] [stdout]    |         ~~~~~                                +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/consistant.rs:111:9
[INFO] [stdout]     |
[INFO] [stdout] 111 |         let _ = self.lock.write().expect("wLock");
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 111 |         let _unused = self.lock.write().expect("wLock");
[INFO] [stdout]     |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 111 |         drop(self.lock.write().expect("wLock"));
[INFO] [stdout]     |         ~~~~~                                 +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `consistent-rs` due to 6 previous errors
[INFO] running `Command { std: "docker" "inspect" "d6e5270d205a373fdd21eabcffd0ed21ba54369e7f7f8551aec2c9599de26464", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d6e5270d205a373fdd21eabcffd0ed21ba54369e7f7f8551aec2c9599de26464", kill_on_drop: false }`
[INFO] [stdout] d6e5270d205a373fdd21eabcffd0ed21ba54369e7f7f8551aec2c9599de26464