[INFO] fetching crate lookahead 0.1.0...
[INFO] checking lookahead-0.1.0 against master#dfd7b8d03fb93d0e03147d28b3be6d93260fa94d for pr-87050
[INFO] extracting crate lookahead 0.1.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate lookahead 0.1.0 on toolchain dfd7b8d03fb93d0e03147d28b3be6d93260fa94d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lookahead 0.1.0
[INFO] finished tweaking crates.io crate lookahead 0.1.0
[INFO] tweaked toml for crates.io crate lookahead 0.1.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 4d3d25b2b13e6cfea1bcf4fe6b5a13cb88eef8e6341a02d6e4bb1332674f473d
[INFO] running `Command { std: "docker" "start" "-a" "4d3d25b2b13e6cfea1bcf4fe6b5a13cb88eef8e6341a02d6e4bb1332674f473d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4d3d25b2b13e6cfea1bcf4fe6b5a13cb88eef8e6341a02d6e4bb1332674f473d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d3d25b2b13e6cfea1bcf4fe6b5a13cb88eef8e6341a02d6e4bb1332674f473d", kill_on_drop: false }`
[INFO] [stdout] 4d3d25b2b13e6cfea1bcf4fe6b5a13cb88eef8e6341a02d6e4bb1332674f473d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4c368a43549c13fe443420ffcf5fb328e0b41eadf0483f0b6e4f0c97cfca67a7
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4c368a43549c13fe443420ffcf5fb328e0b41eadf0483f0b6e4f0c97cfca67a7", kill_on_drop: false }`
[INFO] [stderr]     Checking lookahead v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to <[T; N] as IntoIterator>::into_iter in Rust 2021.
[INFO] [stdout]   --> src/lib.rs:63:28
[INFO] [stdout]    |
[INFO] [stdout] 63 |         let inner = [1, 2].into_iter();
[INFO] [stdout]    |                            ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(array_into_iter)]` on by default
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 63 |         let inner = [1, 2].iter();
[INFO] [stdout]    |                            ^^^^
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 63 |         let inner = IntoIterator::into_iter([1, 2]);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^      ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to <[T; N] as IntoIterator>::into_iter in Rust 2021.
[INFO] [stdout]   --> src/lib.rs:70:28
[INFO] [stdout]    |
[INFO] [stdout] 70 |         let inner = [1, 2].into_iter();
[INFO] [stdout]    |                            ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 70 |         let inner = [1, 2].iter();
[INFO] [stdout]    |                            ^^^^
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 70 |         let inner = IntoIterator::into_iter([1, 2]);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^      ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to <[T; N] as IntoIterator>::into_iter in Rust 2021.
[INFO] [stdout]   --> src/lib.rs:77:28
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let inner = [1, 2].into_iter();
[INFO] [stdout]    |                            ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let inner = [1, 2].iter();
[INFO] [stdout]    |                            ^^^^
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let inner = IntoIterator::into_iter([1, 2]);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^      ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to <[T; N] as IntoIterator>::into_iter in Rust 2021.
[INFO] [stdout]   --> src/lib.rs:84:28
[INFO] [stdout]    |
[INFO] [stdout] 84 |         let inner = [1, 2].into_iter();
[INFO] [stdout]    |                            ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 84 |         let inner = [1, 2].iter();
[INFO] [stdout]    |                            ^^^^
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 84 |         let inner = IntoIterator::into_iter([1, 2]);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^      ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to <[T; N] as IntoIterator>::into_iter in Rust 2021.
[INFO] [stdout]   --> src/lib.rs:92:28
[INFO] [stdout]    |
[INFO] [stdout] 92 |         let inner = [1, 2].into_iter();
[INFO] [stdout]    |                            ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 92 |         let inner = [1, 2].iter();
[INFO] [stdout]    |                            ^^^^
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 92 |         let inner = IntoIterator::into_iter([1, 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 0.46s
[INFO] running `Command { std: "docker" "inspect" "4c368a43549c13fe443420ffcf5fb328e0b41eadf0483f0b6e4f0c97cfca67a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c368a43549c13fe443420ffcf5fb328e0b41eadf0483f0b6e4f0c97cfca67a7", kill_on_drop: false }`
[INFO] [stdout] 4c368a43549c13fe443420ffcf5fb328e0b41eadf0483f0b6e4f0c97cfca67a7