[INFO] fetching crate consistent-rs 0.1.1...
[INFO] checking consistent-rs-0.1.1 against try#1463461488056994d1b84e8b752e7c11c7fae7aa for pr-154205
[INFO] extracting crate consistent-rs 0.1.1 into /workspace/builds/worker-6-tc2/source
[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-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate consistent-rs 0.1.1 on toolchain 1463461488056994d1b84e8b752e7c11c7fae7aa
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1463461488056994d1b84e8b752e7c11c7fae7aa" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1463461488056994d1b84e8b752e7c11c7fae7aa" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 2 packages to latest compatible versions
[INFO] [stderr]       Adding crc v1.8.1 (available: v3.4.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1463461488056994d1b84e8b752e7c11c7fae7aa" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1463461488056994d1b84e8b752e7c11c7fae7aa" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b31a3c7d92db287e6243e78665d5ab273469c0aa1f6cdf721774b7c35e9d3121
[INFO] running `Command { std: "docker" "start" "-a" "b31a3c7d92db287e6243e78665d5ab273469c0aa1f6cdf721774b7c35e9d3121", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b31a3c7d92db287e6243e78665d5ab273469c0aa1f6cdf721774b7c35e9d3121", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b31a3c7d92db287e6243e78665d5ab273469c0aa1f6cdf721774b7c35e9d3121", kill_on_drop: false }`
[INFO] [stdout] b31a3c7d92db287e6243e78665d5ab273469c0aa1f6cdf721774b7c35e9d3121
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1463461488056994d1b84e8b752e7c11c7fae7aa" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a3f6fe920b4fc7db71fa8cb003910ec5e8b46d1755e9eee65b862a6b024b2232
[INFO] running `Command { std: "docker" "start" "-a" "a3f6fe920b4fc7db71fa8cb003910ec5e8b46d1755e9eee65b862a6b024b2232", kill_on_drop: false }`
[INFO] [stderr] warning: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024`
[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] [stderr] error: could not compile `consistent-rs` (lib test) due to 5 previous errors
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/consistant.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 45 |         let _ = self.lock.read().expect("rLock");
[INFO] [stdout]    |             ^ this lock is not assigned to a binding and is immediately dropped
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(let_underscore_lock)]` (part of `#[deny(let_underscore)]`) 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 -         let _ = self.lock.read().expect("rLock");
[INFO] [stdout] 45 +         drop(self.lock.read().expect("rLock"));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[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:51:13
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let _ = self.lock.write().expect("wLock");
[INFO] [stdout]    |             ^ this lock is not assigned to a binding and is immediately dropped
[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 -         let _ = self.lock.write().expect("wLock");
[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:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |         let _ = self.lock.read().expect("rLock");
[INFO] [stdout]    |             ^ this lock is not assigned to a binding and is immediately dropped
[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 -         let _ = self.lock.read().expect("rLock");
[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:80:13
[INFO] [stdout]    |
[INFO] [stdout] 80 |         let _ = self.lock.read().expect("rLock");
[INFO] [stdout]    |             ^ this lock is not assigned to a binding and is immediately dropped
[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 -         let _ = self.lock.read().expect("rLock");
[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:111:13
[INFO] [stdout]     |
[INFO] [stdout] 111 |         let _ = self.lock.write().expect("wLock");
[INFO] [stdout]     |             ^ this lock is not assigned to a binding and is immediately dropped
[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 -         let _ = self.lock.write().expect("wLock");
[INFO] [stdout] 111 +         drop(self.lock.write().expect("wLock"));
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `consistent-rs` (lib) due to 5 previous errors
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/consistant.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 45 |         let _ = self.lock.read().expect("rLock");
[INFO] [stdout]    |             ^ this lock is not assigned to a binding and is immediately dropped
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(let_underscore_lock)]` (part of `#[deny(let_underscore)]`) 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 -         let _ = self.lock.read().expect("rLock");
[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:51:13
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let _ = self.lock.write().expect("wLock");
[INFO] [stdout]    |             ^ this lock is not assigned to a binding and is immediately dropped
[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 -         let _ = self.lock.write().expect("wLock");
[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:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |         let _ = self.lock.read().expect("rLock");
[INFO] [stdout]    |             ^ this lock is not assigned to a binding and is immediately dropped
[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 -         let _ = self.lock.read().expect("rLock");
[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:80:13
[INFO] [stdout]    |
[INFO] [stdout] 80 |         let _ = self.lock.read().expect("rLock");
[INFO] [stdout]    |             ^ this lock is not assigned to a binding and is immediately dropped
[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 -         let _ = self.lock.read().expect("rLock");
[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:111:13
[INFO] [stdout]     |
[INFO] [stdout] 111 |         let _ = self.lock.write().expect("wLock");
[INFO] [stdout]     |             ^ this lock is not assigned to a binding and is immediately dropped
[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 -         let _ = self.lock.write().expect("wLock");
[INFO] [stdout] 111 +         drop(self.lock.write().expect("wLock"));
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "a3f6fe920b4fc7db71fa8cb003910ec5e8b46d1755e9eee65b862a6b024b2232", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a3f6fe920b4fc7db71fa8cb003910ec5e8b46d1755e9eee65b862a6b024b2232", kill_on_drop: false }`
[INFO] [stdout] a3f6fe920b4fc7db71fa8cb003910ec5e8b46d1755e9eee65b862a6b024b2232