[INFO] fetching crate ringbuffer-spsc 0.1.9...
[INFO] checking ringbuffer-spsc-0.1.9 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] extracting crate ringbuffer-spsc 0.1.9 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate ringbuffer-spsc 0.1.9 on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ringbuffer-spsc 0.1.9
[INFO] finished tweaking crates.io crate ringbuffer-spsc 0.1.9
[INFO] tweaked toml for crates.io crate ringbuffer-spsc 0.1.9 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate crates.io crate ringbuffer-spsc 0.1.9 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4485629a37daa6d9efd63f6f75cf3f83fbbb9eb6e99a04a5c3907d7390699577
[INFO] running `Command { std: "docker" "start" "-a" "4485629a37daa6d9efd63f6f75cf3f83fbbb9eb6e99a04a5c3907d7390699577", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4485629a37daa6d9efd63f6f75cf3f83fbbb9eb6e99a04a5c3907d7390699577", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4485629a37daa6d9efd63f6f75cf3f83fbbb9eb6e99a04a5c3907d7390699577", kill_on_drop: false }`
[INFO] [stdout] 4485629a37daa6d9efd63f6f75cf3f83fbbb9eb6e99a04a5c3907d7390699577
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6b23136469cd2572ac71868486904481339ffd03dbd19f59a338380fc971dfd3
[INFO] running `Command { std: "docker" "start" "-a" "6b23136469cd2572ac71868486904481339ffd03dbd19f59a338380fc971dfd3", kill_on_drop: false }`
[INFO] [stderr]     Checking array-init v2.1.0
[INFO] [stderr]     Checking cache-padded v1.2.0
[INFO] [stderr]     Checking ringbuffer-spsc v0.1.9 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `core::mem::replace` that must be used
[INFO] [stdout]    --> src/lib.rs:138:18
[INFO] [stdout]     |
[INFO] [stdout] 138 |         unsafe { mem::replace(self.inner.get_mut(self.local_idx_w), MaybeUninit::new(t)) };
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 138 |         unsafe { let _ = mem::replace(self.inner.get_mut(self.local_idx_w), MaybeUninit::new(t)); };
[INFO] [stdout]     |                  +++++++                                                                        +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `core::mem::replace` that must be used
[INFO] [stdout]    --> src/lib.rs:138:18
[INFO] [stdout]     |
[INFO] [stdout] 138 |         unsafe { mem::replace(self.inner.get_mut(self.local_idx_w), MaybeUninit::new(t)) };
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 138 |         unsafe { let _ = mem::replace(self.inner.get_mut(self.local_idx_w), MaybeUninit::new(t)); };
[INFO] [stdout]     |                  +++++++                                                                        +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.32s
[INFO] running `Command { std: "docker" "inspect" "6b23136469cd2572ac71868486904481339ffd03dbd19f59a338380fc971dfd3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b23136469cd2572ac71868486904481339ffd03dbd19f59a338380fc971dfd3", kill_on_drop: false }`
[INFO] [stdout] 6b23136469cd2572ac71868486904481339ffd03dbd19f59a338380fc971dfd3