[INFO] fetching crate shared-mutex 0.3.1...
[INFO] checking shared-mutex-0.3.1 against master#af4a5a13a15fa0c60e06321077ef452f769b42fd for pr-122960-3
[INFO] extracting crate shared-mutex 0.3.1 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate shared-mutex 0.3.1 on toolchain af4a5a13a15fa0c60e06321077ef452f769b42fd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate shared-mutex 0.3.1
[INFO] finished tweaking crates.io crate shared-mutex 0.3.1
[INFO] tweaked toml for crates.io crate shared-mutex 0.3.1 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 6 packages
[INFO] [stderr]       Adding crossbeam v0.2.12 (latest: v0.8.4)
[INFO] [stderr]       Adding scoped-pool v0.1.10 (latest: v1.0.0)
[INFO] [stderr]       Adding scopeguard v0.1.2 (latest: v1.2.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded variance v0.1.3
[INFO] [stderr]   Downloaded scopeguard v0.1.2
[INFO] [stderr]   Downloaded scoped-pool v0.1.10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aa58ad38b3a29be511f94b3201a078c673311afd2347dc224927fe9f58fcf0a3
[INFO] running `Command { std: "docker" "start" "-a" "aa58ad38b3a29be511f94b3201a078c673311afd2347dc224927fe9f58fcf0a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aa58ad38b3a29be511f94b3201a078c673311afd2347dc224927fe9f58fcf0a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa58ad38b3a29be511f94b3201a078c673311afd2347dc224927fe9f58fcf0a3", kill_on_drop: false }`
[INFO] [stdout] aa58ad38b3a29be511f94b3201a078c673311afd2347dc224927fe9f58fcf0a3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 93989feee7446f611740b502c788cb5f6ef6fed78b56d88462f8e9f576a5c3e0
[INFO] running `Command { std: "docker" "start" "-a" "93989feee7446f611740b502c788cb5f6ef6fed78b56d88462f8e9f576a5c3e0", kill_on_drop: false }`
[INFO] [stderr]     Checking variance v0.1.3
[INFO] [stderr]     Checking poison v0.1.0
[INFO] [stderr]     Checking scopeguard v0.1.2
[INFO] [stderr]     Checking crossbeam v0.2.12
[INFO] [stderr]     Checking shared-mutex v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `poison` is imported redundantly
[INFO] [stdout]   --> src/monitor.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use poison;
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | extern crate poison;
[INFO] [stdout]    | -------------------- the item `poison` is already imported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:80:16
[INFO] [stdout]    |
[INFO] [stdout] 80 |             Ok(try!(unsafe { SharedMutexReadGuard::new(self) }))
[INFO] [stdout]    |                ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:92:16
[INFO] [stdout]    |
[INFO] [stdout] 92 |             Ok(try!(unsafe { SharedMutexWriteGuard::new(self) }))
[INFO] [stdout]    |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/lib.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |         unsafe { self.data.into_inner().into_inner() }
[INFO] [stdout]    |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/raw.rs:141:13
[INFO] [stdout]     |
[INFO] [stdout] 141 |         let _ = self.unlock_read_to();
[INFO] [stdout]     |             ^ this lock is not assigned to a binding and is immediately dropped
[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] 141 |         let _unused = self.unlock_read_to();
[INFO] [stdout]     |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 141 |         drop(self.unlock_read_to());
[INFO] [stdout]     |         ~~~~~                     +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/raw.rs:173:13
[INFO] [stdout]     |
[INFO] [stdout] 173 |         let _ = self.unlock_write_to();
[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] 173 |         let _unused = self.unlock_write_to();
[INFO] [stdout]     |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 173 |         drop(self.unlock_write_to());
[INFO] [stdout]     |         ~~~~~                      +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `shared-mutex` (lib) due to 3 previous errors; 4 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "93989feee7446f611740b502c788cb5f6ef6fed78b56d88462f8e9f576a5c3e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "93989feee7446f611740b502c788cb5f6ef6fed78b56d88462f8e9f576a5c3e0", kill_on_drop: false }`
[INFO] [stdout] 93989feee7446f611740b502c788cb5f6ef6fed78b56d88462f8e9f576a5c3e0