[INFO] updating cached repository https://github.com/naoppy/Language-processing-100-knocks-by-Rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/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] d124c0ec942ac01231dfce01eec322922e6f304b
[INFO] testing naoppy/Language-processing-100-knocks-by-Rust against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnaoppy%2FLanguage-processing-100-knocks-by-Rust" "work/builds/worker-0/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/naoppy/Language-processing-100-knocks-by-Rust on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/naoppy/Language-processing-100-knocks-by-Rust
[INFO] finished tweaking git repo https://github.com/naoppy/Language-processing-100-knocks-by-Rust
[INFO] tweaked toml for git repo https://github.com/naoppy/Language-processing-100-knocks-by-Rust written to work/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/naoppy/Language-processing-100-knocks-by-Rust already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] fde38b415ff23f4334a104e3a0e370f5eedbbc8f925fd2f9c622c71580ecda88
[INFO] running `"docker" "start" "-a" "fde38b415ff23f4334a104e3a0e370f5eedbbc8f925fd2f9c622c71580ecda88"`
[INFO] [stderr]    Compiling gengo100 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: function is never used: `tab_to_space`
[INFO] [stderr]   --> src/chap2/main.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | fn tab_to_space(path: &Path, tab_width: usize) -> io::Result<String> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_col`
[INFO] [stderr]   --> src/chap2/main.rs:35:1
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn get_col(source: &Path, out: &Path, column_number: usize) -> io::Result<()> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `merge_columns`
[INFO] [stderr]   --> src/chap2/main.rs:57:1
[INFO] [stderr]    |
[INFO] [stderr] 57 | fn merge_columns(source1: &Path, source2: &Path) -> io::Result<String> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `heads`
[INFO] [stderr]   --> src/chap2/main.rs:69:1
[INFO] [stderr]    |
[INFO] [stderr] 69 | fn heads(path: &Path, n: usize) -> io::Result<String> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tails`
[INFO] [stderr]   --> src/chap2/main.rs:77:1
[INFO] [stderr]    |
[INFO] [stderr] 77 | fn tails(path: &Path, n: usize) -> io::Result<String> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `split_file`
[INFO] [stderr]   --> src/chap2/main.rs:87:1
[INFO] [stderr]    |
[INFO] [stderr] 87 | fn split_file(path: &Path, n: usize) -> io::Result<Vec<String>> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_column_differences`
[INFO] [stderr]   --> src/chap2/main.rs:96:1
[INFO] [stderr]    |
[INFO] [stderr] 96 | fn get_column_differences(path: &Path, n: usize) -> io::Result<HashSet<String>> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sort_by_column`
[INFO] [stderr]    --> src/chap2/main.rs:114:1
[INFO] [stderr]     |
[INFO] [stderr] 114 | fn sort_by_column(path: &Path, n: usize) -> io::Result<Vec<String>> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sort_by_frequency`
[INFO] [stderr]    --> src/chap2/main.rs:126:1
[INFO] [stderr]     |
[INFO] [stderr] 126 | fn sort_by_frequency(path: &Path) -> io::Result<Vec<String>> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.47s
[INFO] running `"docker" "inspect" "fde38b415ff23f4334a104e3a0e370f5eedbbc8f925fd2f9c622c71580ecda88"`
[INFO] running `"docker" "rm" "-f" "fde38b415ff23f4334a104e3a0e370f5eedbbc8f925fd2f9c622c71580ecda88"`
[INFO] [stdout] fde38b415ff23f4334a104e3a0e370f5eedbbc8f925fd2f9c622c71580ecda88
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "+1.38.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 33ed2fe02d335493ba81aa280b754adbfb337f56b85ff3ffc74105c98cd272c1
[INFO] running `"docker" "start" "-a" "33ed2fe02d335493ba81aa280b754adbfb337f56b85ff3ffc74105c98cd272c1"`
[INFO] [stderr]    Compiling gengo100 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: function is never used: `tab_to_space`
[INFO] [stderr]   --> src/chap2/main.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | fn tab_to_space(path: &Path, tab_width: usize) -> io::Result<String> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_col`
[INFO] [stderr]   --> src/chap2/main.rs:35:1
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn get_col(source: &Path, out: &Path, column_number: usize) -> io::Result<()> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `merge_columns`
[INFO] [stderr]   --> src/chap2/main.rs:57:1
[INFO] [stderr]    |
[INFO] [stderr] 57 | fn merge_columns(source1: &Path, source2: &Path) -> io::Result<String> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `heads`
[INFO] [stderr]   --> src/chap2/main.rs:69:1
[INFO] [stderr]    |
[INFO] [stderr] 69 | fn heads(path: &Path, n: usize) -> io::Result<String> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tails`
[INFO] [stderr]   --> src/chap2/main.rs:77:1
[INFO] [stderr]    |
[INFO] [stderr] 77 | fn tails(path: &Path, n: usize) -> io::Result<String> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `split_file`
[INFO] [stderr]   --> src/chap2/main.rs:87:1
[INFO] [stderr]    |
[INFO] [stderr] 87 | fn split_file(path: &Path, n: usize) -> io::Result<Vec<String>> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_column_differences`
[INFO] [stderr]   --> src/chap2/main.rs:96:1
[INFO] [stderr]    |
[INFO] [stderr] 96 | fn get_column_differences(path: &Path, n: usize) -> io::Result<HashSet<String>> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sort_by_column`
[INFO] [stderr]    --> src/chap2/main.rs:114:1
[INFO] [stderr]     |
[INFO] [stderr] 114 | fn sort_by_column(path: &Path, n: usize) -> io::Result<Vec<String>> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sort_by_frequency`
[INFO] [stderr]    --> src/chap2/main.rs:126:1
[INFO] [stderr]     |
[INFO] [stderr] 126 | fn sort_by_frequency(path: &Path) -> io::Result<Vec<String>> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.35s
[INFO] running `"docker" "inspect" "33ed2fe02d335493ba81aa280b754adbfb337f56b85ff3ffc74105c98cd272c1"`
[INFO] running `"docker" "rm" "-f" "33ed2fe02d335493ba81aa280b754adbfb337f56b85ff3ffc74105c98cd272c1"`
[INFO] [stdout] 33ed2fe02d335493ba81aa280b754adbfb337f56b85ff3ffc74105c98cd272c1
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "+1.38.0" "test" "--frozen"`
[INFO] [stdout] f63a537afc1f7282c4185dcac6e28ffef82979188154a4fc8551698aab0893e6
[INFO] running `"docker" "start" "-a" "f63a537afc1f7282c4185dcac6e28ffef82979188154a4fc8551698aab0893e6"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/chap2-a01d4202bd123997
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "f63a537afc1f7282c4185dcac6e28ffef82979188154a4fc8551698aab0893e6"`
[INFO] running `"docker" "rm" "-f" "f63a537afc1f7282c4185dcac6e28ffef82979188154a4fc8551698aab0893e6"`
[INFO] [stdout] f63a537afc1f7282c4185dcac6e28ffef82979188154a4fc8551698aab0893e6