[INFO] updating cached repository https://github.com/KallDrexx/cryptoquip_solver_rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0d93020defd2cd032ca413a3ffbec340ffa53394
[INFO] testing KallDrexx/cryptoquip_solver_rust against beta-2020-06-03 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKallDrexx%2Fcryptoquip_solver_rust" "/workspace/builds/worker-0/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/KallDrexx/cryptoquip_solver_rust on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/KallDrexx/cryptoquip_solver_rust
[INFO] finished tweaking git repo https://github.com/KallDrexx/cryptoquip_solver_rust
[INFO] tweaked toml for git repo https://github.com/KallDrexx/cryptoquip_solver_rust written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/KallDrexx/cryptoquip_solver_rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f17d83a41619276470aa6a3df05111ee1f9e473ec7b9b3c42900377dac010597
[INFO] running `"docker" "start" "-a" "f17d83a41619276470aa6a3df05111ee1f9e473ec7b9b3c42900377dac010597"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling cryptoquip_solver v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(std_misc,collections)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]  --> src/char_mapping.rs:8:11
[INFO] [stderr]   |
[INFO] [stderr] 8 |     for x in (0..input.len()) {
[INFO] [stderr]   |              ^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `cryptoquip_solver`
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | / #![feature(std_misc,collections)]
[INFO] [stderr] 2 | |
[INFO] [stderr] 3 | | mod types;
[INFO] [stderr] 4 | | mod fingerprinter;
[INFO] [stderr] 5 | | mod value_readers;
[INFO] [stderr] 6 | | mod char_mapping;
[INFO] [stderr]   | |_________________^ consider adding a `main` function to `src/main.rs`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for reference `&str` in the current scope
[INFO] [stderr]  --> src/char_mapping.rs:9:26
[INFO] [stderr]   |
[INFO] [stderr] 9 |         let input_char = input.char_at(x);
[INFO] [stderr]   |                                ^^^^^^^ method not found in `&str`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for reference `&str` in the current scope
[INFO] [stderr]   --> src/char_mapping.rs:10:34
[INFO] [stderr]    |
[INFO] [stderr] 10 |         let candidate_char = candidate.char_at(x);
[INFO] [stderr]    |                                        ^^^^^^^ method not found in `&str`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0599, E0601.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `cryptoquip_solver`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f17d83a41619276470aa6a3df05111ee1f9e473ec7b9b3c42900377dac010597"`
[INFO] running `"docker" "rm" "-f" "f17d83a41619276470aa6a3df05111ee1f9e473ec7b9b3c42900377dac010597"`
[INFO] [stdout] f17d83a41619276470aa6a3df05111ee1f9e473ec7b9b3c42900377dac010597