[INFO] fetching crate ringbuf 0.2.6...
[INFO] checking ringbuf-0.2.6 against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3
[INFO] extracting crate ringbuf 0.2.6 into /workspace/builds/worker-77/source
[INFO] validating manifest of crates.io crate ringbuf 0.2.6 on toolchain a7a572ce3edd6d476191fbfe92c9c1986e009b34
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ringbuf 0.2.6
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate ringbuf 0.2.6
[INFO] tweaked toml for crates.io crate ringbuf 0.2.6 written to /workspace/builds/worker-77/source/Cargo.toml
[INFO] crate crates.io crate ringbuf 0.2.6 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 73f362853cc0d619ffe637b829839b20878d3db698229b02cce4bb53829344e8
[INFO] running `Command { std: "docker" "start" "-a" "73f362853cc0d619ffe637b829839b20878d3db698229b02cce4bb53829344e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "73f362853cc0d619ffe637b829839b20878d3db698229b02cce4bb53829344e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73f362853cc0d619ffe637b829839b20878d3db698229b02cce4bb53829344e8", kill_on_drop: false }`
[INFO] [stdout] 73f362853cc0d619ffe637b829839b20878d3db698229b02cce4bb53829344e8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 454bd9e39bef985ddd969fb2f88238338aff8d90438c13ba3dca6cefc3ef56eb
[INFO] running `Command { std: "docker" "start" "-a" "454bd9e39bef985ddd969fb2f88238338aff8d90438c13ba3dca6cefc3ef56eb", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] Running `cargo fix --edition`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking cache-padded v1.1.1
[INFO] [stderr]     Checking ringbuf v0.2.6 (/tmp/fixit)
[INFO] [stderr]    Migrating src/lib.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating examples/simple.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating examples/message.rs from 2018 edition to 2021
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.08s
[INFO] [stderr] Running `cargo check` to verify 2021
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking ringbuf v0.2.6 (/tmp/fixit)
[INFO] [stdout] warning: unused variable: `prod`
[INFO] [stdout]   --> src/tests/single.rs:33:10
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let (prod, cons) = buf.split();
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_prod`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cons`
[INFO] [stdout]   --> src/tests/single.rs:33:16
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let (prod, cons) = buf.split();
[INFO] [stdout]    |                ^^^^ help: if this is intentional, prefix it with an underscore: `_cons`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.08s
[INFO] running `Command { std: "docker" "inspect" "454bd9e39bef985ddd969fb2f88238338aff8d90438c13ba3dca6cefc3ef56eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "454bd9e39bef985ddd969fb2f88238338aff8d90438c13ba3dca6cefc3ef56eb", kill_on_drop: false }`
[INFO] [stdout] 454bd9e39bef985ddd969fb2f88238338aff8d90438c13ba3dca6cefc3ef56eb