[INFO] updating cached repository https://github.com/t-eckert/ctci_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] 4b2fcf04ee3818df8063d4c1dc24b039202e5245
[INFO] checking t-eckert/ctci_rust against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ft-eckert%2Fctci_rust" "/workspace/builds/worker-3/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/t-eckert/ctci_rust on toolchain 45d050cde277b22a755847338f2acc2c7b834141
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/t-eckert/ctci_rust
[INFO] finished tweaking git repo https://github.com/t-eckert/ctci_rust
[INFO] tweaked toml for git repo https://github.com/t-eckert/ctci_rust written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/t-eckert/ctci_rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 32d3cff721e2b565019c29ffb22dba7ab73e882ecafa9af5c09c9924000564c7
[INFO] running `"docker" "start" "-a" "32d3cff721e2b565019c29ffb22dba7ab73e882ecafa9af5c09c9924000564c7"`
[INFO] [stderr]     Checking ctci_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]  --> ch01_arrays_and_strings/q01_is_unique.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     /// Returns true if a string contains no duplicate characters.
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 9 |     let input_set: HashSet<char> = HashSet::from_iter(input.chars());
[INFO] [stderr]   |     ----------------------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `ctci_rust`
[INFO] [stderr]   |
[INFO] [stderr]   = note: consider adding a `main` function to `src/main.rs`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]  --> ch01_arrays_and_strings/q01_is_unique.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     /// Returns true if a string contains no duplicate characters.
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 9 |     let input_set: HashSet<char> = HashSet::from_iter(input.chars());
[INFO] [stderr]   |     ----------------------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `is_unique`
[INFO] [stderr]   --> ch01_arrays_and_strings/q01_is_unique.rs:1:1
[INFO] [stderr]    |
[INFO] [stderr] 1  | / /// 1.1 Is Unique: 
[INFO] [stderr] 2  | | /// Implement an algorithm to determine if a string has all unique
[INFO] [stderr] 3  | | /// characters. What if you cannot use additional data structures?
[INFO] [stderr] 4  | | use std::collections::HashSet;
[INFO] [stderr] ...  |
[INFO] [stderr] 39 | |     }
[INFO] [stderr] 40 | | }
[INFO] [stderr]    | |_^ consider adding a `main` function to `ch01_arrays_and_strings/q01_is_unique.rs`
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `ctci_rust`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to previous error; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `ctci_rust`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "32d3cff721e2b565019c29ffb22dba7ab73e882ecafa9af5c09c9924000564c7"`
[INFO] running `"docker" "rm" "-f" "32d3cff721e2b565019c29ffb22dba7ab73e882ecafa9af5c09c9924000564c7"`
[INFO] [stdout] 32d3cff721e2b565019c29ffb22dba7ab73e882ecafa9af5c09c9924000564c7