[INFO] cloning repository CollinValley/rust_practice
[INFO] running `"git" "clone" "--bare" "git://github.com/CollinValley/rust_practice.git" "work/cache/sources/gh/CollinValley/rust_practice"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/CollinValley/rust_practice'...
[INFO] running `"git" "clone" "work/cache/sources/gh/CollinValley/rust_practice" "work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/CollinValley/rust_practice"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/CollinValley/rust_practice'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/CollinValley/rust_practice" "work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/CollinValley/rust_practice"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/CollinValley/rust_practice'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f43ee9bf1397a7e46b78a5a03bc6811988dfc58f
[INFO] sha for GitHub repo CollinValley/rust_practice: f43ee9bf1397a7e46b78a5a03bc6811988dfc58f
[INFO] validating manifest of CollinValley/rust_practice on toolchain master#c0086b9e8972fef9fd4af24bae20d45021ed06c6
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of CollinValley/rust_practice on toolchain try#290ac7b29f41ff9fa5232f9a1116ea71a3501063
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+290ac7b29f41ff9fa5232f9a1116ea71a3501063-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing CollinValley/rust_practice
[INFO] finished frobbing CollinValley/rust_practice
[INFO] frobbed toml for CollinValley/rust_practice written to work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/CollinValley/rust_practice/Cargo.toml
[INFO] started frobbing CollinValley/rust_practice
[INFO] finished frobbing CollinValley/rust_practice
[INFO] frobbed toml for CollinValley/rust_practice written to work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/CollinValley/rust_practice/Cargo.toml
[INFO] crate CollinValley/rust_practice has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+290ac7b29f41ff9fa5232f9a1116ea71a3501063-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking CollinValley/rust_practice against master#c0086b9e8972fef9fd4af24bae20d45021ed06c6 for pr-58899
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-58899/worker-2/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/CollinValley/rust_practice:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 06db3ee461629bb0bca4619cc044045a12819f104895ac1bdd0003819b4d848a
[INFO] running `"docker" "start" "-a" "06db3ee461629bb0bca4619cc044045a12819f104895ac1bdd0003819b4d848a"`
[INFO] [stderr]     Checking rust_practice v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: use of deprecated item 'core::str::<impl str>::trim_right_matches': superseded by `trim_end_matches`
[INFO] [stderr]   --> src/chapter_10.rs:84:23
[INFO] [stderr]    |
[INFO] [stderr] 84 |         self.plural().trim_right_matches('s')
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(deprecated)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Extrema`
[INFO] [stderr]    --> src/chapter_9.rs:157:1
[INFO] [stderr]     |
[INFO] [stderr] 157 | struct Extrema<'elt> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `find_extrema`
[INFO] [stderr]    --> src/chapter_9.rs:162:1
[INFO] [stderr]     |
[INFO] [stderr] 162 | fn find_extrema<'s>(slice: &'s [i32]) -> Extrema<'s> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `say_hello`
[INFO] [stderr]  --> src/chapter_11.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn say_hello(out: &mut Write) -> std::io::Result<()> {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `min`
[INFO] [stderr]   --> src/chapter_11.rs:32:1
[INFO] [stderr]    |
[INFO] [stderr] 32 | fn min<T: Ord>(value1: T, value2: T) -> T {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `dot`
[INFO] [stderr]    --> src/chapter_11.rs:199:1
[INFO] [stderr]     |
[INFO] [stderr] 199 | / fn dot<N>(v1: &[N], v2: &[N]) -> N
[INFO] [stderr] 200 | |     where N: Add<Output=N> + Mul<Output=N> + Default + Copy
[INFO] [stderr] 201 | | {
[INFO] [stderr] 202 | |     let mut total = N::default(); //All numerical types default will equal 0
[INFO] [stderr] ...   |
[INFO] [stderr] 206 | |     total
[INFO] [stderr] 207 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'core::str::<impl str>::trim_right_matches': superseded by `trim_end_matches`
[INFO] [stderr]   --> src/chapter_10.rs:84:23
[INFO] [stderr]    |
[INFO] [stderr] 84 |         self.plural().trim_right_matches('s')
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(deprecated)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.20s
[INFO] running `"docker" "inspect" "06db3ee461629bb0bca4619cc044045a12819f104895ac1bdd0003819b4d848a"`
[INFO] running `"docker" "rm" "-f" "06db3ee461629bb0bca4619cc044045a12819f104895ac1bdd0003819b4d848a"`
[INFO] [stdout] 06db3ee461629bb0bca4619cc044045a12819f104895ac1bdd0003819b4d848a