[INFO] cloning repository https://github.com/troublescooter/sudoku
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/troublescooter/sudoku" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftroublescooter%2Fsudoku", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftroublescooter%2Fsudoku'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 87b434f31b8e38c98aa67ccd35801cfafb7033ac
[INFO] building troublescooter/sudoku against master#ff34b919075f35a1787659e9c448a34b06bab8de for issue-85264
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftroublescooter%2Fsudoku" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/troublescooter/sudoku on toolchain ff34b919075f35a1787659e9c448a34b06bab8de
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/troublescooter/sudoku
[INFO] finished tweaking git repo https://github.com/troublescooter/sudoku
[INFO] tweaked toml for git repo https://github.com/troublescooter/sudoku written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/troublescooter/sudoku already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0cc0ecf0b654087ff79d0b8fa37da0c2cb4acc362e07da0f6d99e7869de1194b
[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" "0cc0ecf0b654087ff79d0b8fa37da0c2cb4acc362e07da0f6d99e7869de1194b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0cc0ecf0b654087ff79d0b8fa37da0c2cb4acc362e07da0f6d99e7869de1194b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0cc0ecf0b654087ff79d0b8fa37da0c2cb4acc362e07da0f6d99e7869de1194b", kill_on_drop: false }`
[INFO] [stdout] 0cc0ecf0b654087ff79d0b8fa37da0c2cb4acc362e07da0f6d99e7869de1194b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6291c3401daa65e0366e5f6279659a311b01d9ffb084730e0b5720e865757a91
[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" "6291c3401daa65e0366e5f6279659a311b01d9ffb084730e0b5720e865757a91", kill_on_drop: false }`
[INFO] [stderr]    Compiling sudoku v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `once`, `repeat`
[INFO] [stdout]  --> src/main.rs:3:17
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::iter::{once, repeat};
[INFO] [stdout]   |                 ^^^^  ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `impl Iterator: DoubleEndedIterator` is not satisfied
[INFO] [stdout]   --> src/main.rs:45:42
[INFO] [stdout]    |
[INFO] [stdout] 45 |     ) -> impl DoubleEndedIterator<Item = impl DoubleEndedIterator<Item = (usize, &'_ T)>> {
[INFO] [stdout]    |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `DoubleEndedIterator` is not implemented for `impl Iterator`
[INFO] [stdout]    |
[INFO] [stdout]    = note: required because of the requirements on the impl of `DoubleEndedIterator` for `Zip<impl Iterator, std::slice::Iter<'_, T>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `impl Iterator: ExactSizeIterator` is not satisfied
[INFO] [stdout]   --> src/main.rs:45:42
[INFO] [stdout]    |
[INFO] [stdout] 45 |     ) -> impl DoubleEndedIterator<Item = impl DoubleEndedIterator<Item = (usize, &'_ T)>> {
[INFO] [stdout]    |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `ExactSizeIterator` is not implemented for `impl Iterator`
[INFO] [stdout]    |
[INFO] [stdout]    = note: required because of the requirements on the impl of `DoubleEndedIterator` for `Zip<impl Iterator, std::slice::Iter<'_, T>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `sudoku`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "6291c3401daa65e0366e5f6279659a311b01d9ffb084730e0b5720e865757a91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6291c3401daa65e0366e5f6279659a311b01d9ffb084730e0b5720e865757a91", kill_on_drop: false }`
[INFO] [stdout] 6291c3401daa65e0366e5f6279659a311b01d9ffb084730e0b5720e865757a91
