[INFO] cloning repository https://github.com/Connicpu/adventofcode
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Connicpu/adventofcode" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FConnicpu%2Fadventofcode", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FConnicpu%2Fadventofcode'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 30e90eae39aff3c2a8e9885f4125a8c51f2c04be
[INFO] testing Connicpu/adventofcode against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FConnicpu%2Fadventofcode" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Connicpu/adventofcode on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Connicpu/adventofcode
[INFO] finished tweaking git repo https://github.com/Connicpu/adventofcode
[INFO] tweaked toml for git repo https://github.com/Connicpu/adventofcode written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/Connicpu/adventofcode already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] error: the lock file /workspace/builds/worker-0/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 43c36b6744601d346ac8c5d0658d30c382669b7fc72a54e013d0c770e55b7e44
[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" "43c36b6744601d346ac8c5d0658d30c382669b7fc72a54e013d0c770e55b7e44", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "43c36b6744601d346ac8c5d0658d30c382669b7fc72a54e013d0c770e55b7e44", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "43c36b6744601d346ac8c5d0658d30c382669b7fc72a54e013d0c770e55b7e44", kill_on_drop: false }`
[INFO] [stdout] 43c36b6744601d346ac8c5d0658d30c382669b7fc72a54e013d0c770e55b7e44
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 201d22e1571d68c9f29965dac76eca70d609c69a69c48e44325b07e6cc68bb81
[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" "201d22e1571d68c9f29965dac76eca70d609c69a69c48e44325b07e6cc68bb81", kill_on_drop: false }`
[INFO] [stderr]    Compiling adventofcode v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(io, slice_patterns)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/day_1.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::Read;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/day_3.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::Read;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `chars` found for struct `File` in the current scope
[INFO] [stdout]  --> src/day_1.rs:8:19
[INFO] [stdout]   |
[INFO] [stdout] 8 |     for c in file.chars() {
[INFO] [stdout]   |                   ^^^^^ method not found in `File`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `chars` found for struct `File` in the current scope
[INFO] [stdout]   --> src/day_1.rs:24:19
[INFO] [stdout]    |
[INFO] [stdout] 24 |     for c in file.chars() {
[INFO] [stdout]    |                   ^^^^^ method not found in `File`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `chars` found for struct `File` in the current scope
[INFO] [stdout]   --> src/day_3.rs:12:19
[INFO] [stdout]    |
[INFO] [stdout] 12 |     for c in file.chars() {
[INFO] [stdout]    |                   ^^^^^ method not found in `File`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `chars` found for struct `File` in the current scope
[INFO] [stdout]   --> src/day_3.rs:35:19
[INFO] [stdout]    |
[INFO] [stdout] 35 |     for c in file.chars() {
[INFO] [stdout]    |                   ^^^^^ method not found in `File`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors; 2 warnings emitted
[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: could not compile `adventofcode`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "201d22e1571d68c9f29965dac76eca70d609c69a69c48e44325b07e6cc68bb81", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "201d22e1571d68c9f29965dac76eca70d609c69a69c48e44325b07e6cc68bb81", kill_on_drop: false }`
[INFO] [stdout] 201d22e1571d68c9f29965dac76eca70d609c69a69c48e44325b07e6cc68bb81