[INFO] fetching crate slice-deque 0.3.0...
[INFO] checking slice-deque-0.3.0 against try#07fecb9cf34c4979a772ba38c99d6d9144768413 for pr-87710
[INFO] extracting crate slice-deque 0.3.0 into /workspace/builds/worker-81/source
[INFO] validating manifest of crates.io crate slice-deque 0.3.0 on toolchain 07fecb9cf34c4979a772ba38c99d6d9144768413
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate slice-deque 0.3.0
[INFO] finished tweaking crates.io crate slice-deque 0.3.0
[INFO] tweaked toml for crates.io crate slice-deque 0.3.0 written to /workspace/builds/worker-81/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: Found `feature = ...` in `target.'cfg(...)'.dependencies`. This key is not supported for selecting dependencies and will not work as expected. Use the [features] section instead: https://doc.rust-lang.org/cargo/reference/features.html
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mach v0.3.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 69ebff70d887df1c8cb8fa7a116b4dc31a711dbccb8dc43b4b20fc448f9d066a
[INFO] running `Command { std: "docker" "start" "-a" "69ebff70d887df1c8cb8fa7a116b4dc31a711dbccb8dc43b4b20fc448f9d066a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "69ebff70d887df1c8cb8fa7a116b4dc31a711dbccb8dc43b4b20fc448f9d066a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69ebff70d887df1c8cb8fa7a116b4dc31a711dbccb8dc43b4b20fc448f9d066a", kill_on_drop: false }`
[INFO] [stdout] 69ebff70d887df1c8cb8fa7a116b4dc31a711dbccb8dc43b4b20fc448f9d066a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1e6a17807f84f8b4bfffe4bbe78527d25bf85c3cb6463d3192a334b4c6c17d07
[INFO] running `Command { std: "docker" "start" "-a" "1e6a17807f84f8b4bfffe4bbe78527d25bf85c3cb6463d3192a334b4c6c17d07", kill_on_drop: false }`
[INFO] [stderr] warning: Found `feature = ...` in `target.'cfg(...)'.dependencies`. This key is not supported for selecting dependencies and will not work as expected. Use the [features] section instead: https://doc.rust-lang.org/cargo/reference/features.html
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.100
[INFO] [stderr]     Checking slice-deque v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/lib.rs:3903:9
[INFO] [stdout]      |
[INFO] [stdout] 3903 |         &x[!0..];
[INFO] [stdout]      |         ^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 3903 |         let _ = &x[!0..];
[INFO] [stdout]      |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/lib.rs:3910:9
[INFO] [stdout]      |
[INFO] [stdout] 3910 |         &x[..6];
[INFO] [stdout]      |         ^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 3910 |         let _ = &x[..6];
[INFO] [stdout]      |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/lib.rs:3917:9
[INFO] [stdout]      |
[INFO] [stdout] 3917 |         &x[!0..4];
[INFO] [stdout]      |         ^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 3917 |         let _ = &x[!0..4];
[INFO] [stdout]      |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/lib.rs:3924:9
[INFO] [stdout]      |
[INFO] [stdout] 3924 |         &x[1..6];
[INFO] [stdout]      |         ^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 3924 |         let _ = &x[1..6];
[INFO] [stdout]      |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/lib.rs:3931:9
[INFO] [stdout]      |
[INFO] [stdout] 3931 |         &x[3..2];
[INFO] [stdout]      |         ^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 3931 |         let _ = &x[3..2];
[INFO] [stdout]      |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.63s
[INFO] running `Command { std: "docker" "inspect" "1e6a17807f84f8b4bfffe4bbe78527d25bf85c3cb6463d3192a334b4c6c17d07", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e6a17807f84f8b4bfffe4bbe78527d25bf85c3cb6463d3192a334b4c6c17d07", kill_on_drop: false }`
[INFO] [stdout] 1e6a17807f84f8b4bfffe4bbe78527d25bf85c3cb6463d3192a334b4c6c17d07