[INFO] cloning repository https://github.com/Riari/aoc-2020
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Riari/aoc-2020" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRiari%2Faoc-2020", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRiari%2Faoc-2020'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 183ab24242c4ae20970979f2ee8ac5f87ab2b586
[INFO] testing Riari/aoc-2020 against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRiari%2Faoc-2020" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Riari/aoc-2020 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Riari/aoc-2020
[INFO] finished tweaking git repo https://github.com/Riari/aoc-2020
[INFO] tweaked toml for git repo https://github.com/Riari/aoc-2020 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/Riari/aoc-2020 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7f85b2e072c065fe20720c6b9813ae385f76ba4a0bc3a90f9b44d21625dca9ee
[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" "7f85b2e072c065fe20720c6b9813ae385f76ba4a0bc3a90f9b44d21625dca9ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7f85b2e072c065fe20720c6b9813ae385f76ba4a0bc3a90f9b44d21625dca9ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7f85b2e072c065fe20720c6b9813ae385f76ba4a0bc3a90f9b44d21625dca9ee", kill_on_drop: false }`
[INFO] [stdout] 7f85b2e072c065fe20720c6b9813ae385f76ba4a0bc3a90f9b44d21625dca9ee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2662c02fafe955dd0298a5b35d42cb8658c022365aaa0aa868f268412f5cdcc2
[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" "2662c02fafe955dd0298a5b35d42cb8658c022365aaa0aa868f268412f5cdcc2", kill_on_drop: false }`
[INFO] [stderr]    Compiling aoc-2020 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/bin/13.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(map_first_last)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/bin/08.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(map_first_last)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `aoc-2020` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/bin/20.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(iterator_fold_self)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `fold_first` found for struct `std::slice::Iter` in the current scope
[INFO] [stdout]    --> src/bin/20.rs:208:30
[INFO] [stdout]     |
[INFO] [stdout] 208 |     corners.push(grid.iter().fold_first(|a, b| if a.pos.x <= b.pos.x && a.pos.y <= b.pos.y { a } else { b }).unwrap().id);
[INFO] [stdout]     |                              ^^^^^^^^^^ method not found in `std::slice::Iter<'_, Tile>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `fold_first` found for struct `std::slice::Iter` in the current scope
[INFO] [stdout]    --> src/bin/20.rs:209:30
[INFO] [stdout]     |
[INFO] [stdout] 209 |     corners.push(grid.iter().fold_first(|a, b| if a.pos.x <= b.pos.x && a.pos.y >= b.pos.y { a } else { b }).unwrap().id);
[INFO] [stdout]     |                              ^^^^^^^^^^ method not found in `std::slice::Iter<'_, Tile>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `fold_first` found for struct `std::slice::Iter` in the current scope
[INFO] [stdout]    --> src/bin/20.rs:210:30
[INFO] [stdout]     |
[INFO] [stdout] 210 |     corners.push(grid.iter().fold_first(|a, b| if a.pos.x >= b.pos.x && a.pos.y >= b.pos.y { a } else { b }).unwrap().id);
[INFO] [stdout]     |                              ^^^^^^^^^^ method not found in `std::slice::Iter<'_, Tile>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `fold_first` found for struct `std::slice::Iter` in the current scope
[INFO] [stdout]    --> src/bin/20.rs:211:30
[INFO] [stdout]     |
[INFO] [stdout] 211 |     corners.push(grid.iter().fold_first(|a, b| if a.pos.x >= b.pos.x && a.pos.y <= b.pos.y { a } else { b }).unwrap().id);
[INFO] [stdout]     |                              ^^^^^^^^^^ method not found in `std::slice::Iter<'_, Tile>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "2662c02fafe955dd0298a5b35d42cb8658c022365aaa0aa868f268412f5cdcc2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2662c02fafe955dd0298a5b35d42cb8658c022365aaa0aa868f268412f5cdcc2", kill_on_drop: false }`
[INFO] [stdout] 2662c02fafe955dd0298a5b35d42cb8658c022365aaa0aa868f268412f5cdcc2