[INFO] cloning repository https://github.com/KallDrexx/cryptoquip_solver_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/KallDrexx/cryptoquip_solver_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKallDrexx%2Fcryptoquip_solver_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKallDrexx%2Fcryptoquip_solver_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0d93020defd2cd032ca413a3ffbec340ffa53394
[INFO] testing KallDrexx/cryptoquip_solver_rust against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKallDrexx%2Fcryptoquip_solver_rust" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/KallDrexx/cryptoquip_solver_rust 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/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-10/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 `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-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] f9e65cee84ebd392f9ec736b0b78d1888669147a6a0d415eab498c7ff7872dc4
[INFO] running `Command { std: "docker" "start" "-a" "f9e65cee84ebd392f9ec736b0b78d1888669147a6a0d415eab498c7ff7872dc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f9e65cee84ebd392f9ec736b0b78d1888669147a6a0d415eab498c7ff7872dc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9e65cee84ebd392f9ec736b0b78d1888669147a6a0d415eab498c7ff7872dc4", kill_on_drop: false }`
[INFO] [stdout] f9e65cee84ebd392f9ec736b0b78d1888669147a6a0d415eab498c7ff7872dc4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] 9b2bca7c77c503845f12c4abe6b37be966512b73a2e396386ffea8cb09b42e32
[INFO] running `Command { std: "docker" "start" "-a" "9b2bca7c77c503845f12c4abe6b37be966512b73a2e396386ffea8cb09b42e32", kill_on_drop: false }`
[INFO] [stderr]    Compiling cryptoquip_solver v0.0.1 (/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(std_misc,collections)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]  --> src/char_mapping.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 |     for x in (0..input.len()) {
[INFO] [stdout]   |              ^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0601]: `main` function not found in crate `cryptoquip_solver`
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(std_misc,collections)]
[INFO] [stdout] 2 | |
[INFO] [stdout] 3 | | mod types;
[INFO] [stdout] 4 | | mod fingerprinter;
[INFO] [stdout] 5 | | mod value_readers;
[INFO] [stdout] 6 | | mod char_mapping;
[INFO] [stdout]   | |_________________^ consider adding a `main` function to `src/main.rs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for reference `&str` in the current scope
[INFO] [stdout]  --> src/char_mapping.rs:9:26
[INFO] [stdout]   |
[INFO] [stdout] 9 |         let input_char = input.char_at(x);
[INFO] [stdout]   |                                ^^^^^^^ method not found in `&str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/char_mapping.rs:10:34
[INFO] [stdout]    |
[INFO] [stdout] 10 |         let candidate_char = candidate.char_at(x);
[INFO] [stdout]    |                                        ^^^^^^^ method not found in `&str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0599, E0601.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cryptoquip_solver` due to 5 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "9b2bca7c77c503845f12c4abe6b37be966512b73a2e396386ffea8cb09b42e32", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b2bca7c77c503845f12c4abe6b37be966512b73a2e396386ffea8cb09b42e32", kill_on_drop: false }`
[INFO] [stdout] 9b2bca7c77c503845f12c4abe6b37be966512b73a2e396386ffea8cb09b42e32