[INFO] updating cached repository ickshonpe/rust-data-structures
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ickshonpe/rust-data-structures
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ickshonpe/rust-data-structures" "work/ex/pr-57321/sources/master#c0bbc3927e28c22edefe6a1353b5ecc95ea9a104/gh/ickshonpe/rust-data-structures"`
[INFO] [stderr] Cloning into 'work/ex/pr-57321/sources/master#c0bbc3927e28c22edefe6a1353b5ecc95ea9a104/gh/ickshonpe/rust-data-structures'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ickshonpe/rust-data-structures" "work/ex/pr-57321/sources/try#b9139d2caca1db46014a9c302d5c47cfae0d8ae0/gh/ickshonpe/rust-data-structures"`
[INFO] [stderr] Cloning into 'work/ex/pr-57321/sources/try#b9139d2caca1db46014a9c302d5c47cfae0d8ae0/gh/ickshonpe/rust-data-structures'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] af0bf8f5e24687dad2a324e4518931fdbad50590
[INFO] sha for GitHub repo ickshonpe/rust-data-structures: af0bf8f5e24687dad2a324e4518931fdbad50590
[INFO] validating manifest of ickshonpe/rust-data-structures on toolchain master#c0bbc3927e28c22edefe6a1353b5ecc95ea9a104
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0bbc3927e28c22edefe6a1353b5ecc95ea9a104-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ickshonpe/rust-data-structures on toolchain try#b9139d2caca1db46014a9c302d5c47cfae0d8ae0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b9139d2caca1db46014a9c302d5c47cfae0d8ae0-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing ickshonpe/rust-data-structures
[INFO] finished frobbing ickshonpe/rust-data-structures
[INFO] frobbed toml for ickshonpe/rust-data-structures written to work/ex/pr-57321/sources/master#c0bbc3927e28c22edefe6a1353b5ecc95ea9a104/gh/ickshonpe/rust-data-structures/Cargo.toml
[INFO] started frobbing ickshonpe/rust-data-structures
[INFO] finished frobbing ickshonpe/rust-data-structures
[INFO] frobbed toml for ickshonpe/rust-data-structures written to work/ex/pr-57321/sources/try#b9139d2caca1db46014a9c302d5c47cfae0d8ae0/gh/ickshonpe/rust-data-structures/Cargo.toml
[INFO] crate ickshonpe/rust-data-structures has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0bbc3927e28c22edefe6a1353b5ecc95ea9a104-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b9139d2caca1db46014a9c302d5c47cfae0d8ae0-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking ickshonpe/rust-data-structures against try#b9139d2caca1db46014a9c302d5c47cfae0d8ae0 for pr-57321
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57321/worker-6/try#b9139d2caca1db46014a9c302d5c47cfae0d8ae0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57321/sources/try#b9139d2caca1db46014a9c302d5c47cfae0d8ae0/gh/ickshonpe/rust-data-structures:/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" "+b9139d2caca1db46014a9c302d5c47cfae0d8ae0-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 71aab35c0999e5dce3e3db7ee35859ad721e817078dcef82598009023b90e8c3
[INFO] running `"docker" "start" "-a" "71aab35c0999e5dce3e3db7ee35859ad721e817078dcef82598009023b90e8c3"`
[INFO] [stderr]     Checking data-structures v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::mem`
[INFO] [stderr]  --> src/list.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::mem;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `list::*`
[INFO] [stderr]   --> src/main.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use list::*;
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::mem`
[INFO] [stderr]  --> src/list.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::mem;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `list::*`
[INFO] [stderr]   --> src/main.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use list::*;
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `merge_sort`
[INFO] [stderr]  --> src/merge_sort.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | pub fn merge_sort<T: PartialOrd + Copy>(xs: &[T]) -> Vec<T> {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `merge`
[INFO] [stderr]   --> src/merge_sort.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | pub fn merge<T: PartialOrd + Copy>(mut left: &[T], mut right: &[T]) -> Vec<T> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `id`
[INFO] [stderr]  --> src/tricks.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn id<T>(x: T) -> T {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `Link`
[INFO] [stderr]  --> src/list.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | type Link<T> = Option<Box<Node<T>>>;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `len`
[INFO] [stderr]   --> src/list.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     pub fn len(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/list.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     pub fn new() -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `peek`
[INFO] [stderr]   --> src/list.rs:37:5
[INFO] [stderr]    |
[INFO] [stderr] 37 |     pub fn peek(&self) -> Option<&T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `peek_mut`
[INFO] [stderr]   --> src/list.rs:44:5
[INFO] [stderr]    |
[INFO] [stderr] 44 |     pub fn peek_mut(&mut self) -> Option<&mut T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push`
[INFO] [stderr]   --> src/list.rs:52:5
[INFO] [stderr]    |
[INFO] [stderr] 52 |     pub fn push(&mut self, item: T) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `back`
[INFO] [stderr]   --> src/list.rs:67:5
[INFO] [stderr]    |
[INFO] [stderr] 67 |     fn back(&mut self) -> &mut Link<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `back_id`
[INFO] [stderr]   --> src/list.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |     fn back_id(&mut self) -> &mut Link<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `back_tmp`
[INFO] [stderr]   --> src/list.rs:87:5
[INFO] [stderr]    |
[INFO] [stderr] 87 |     fn back_tmp(&mut self) -> &mut Link<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push_back`
[INFO] [stderr]   --> src/list.rs:99:5
[INFO] [stderr]    |
[INFO] [stderr] 99 |     pub fn push_back(&mut self, item: T) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push_back_rec`
[INFO] [stderr]    --> src/list.rs:112:5
[INFO] [stderr]     |
[INFO] [stderr] 112 |     pub fn push_back_rec(&mut self, item: T) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `append`
[INFO] [stderr]    --> src/list.rs:113:9
[INFO] [stderr]     |
[INFO] [stderr] 113 |         fn append<T>(node: &mut Option<Box<Node<T>>>, item: T) {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `quick_sort`
[INFO] [stderr]  --> src/quick_sort_slice.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn quick_sort<T: PartialOrd>(data: &mut [T]) {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `partition`
[INFO] [stderr]   --> src/quick_sort_slice.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn partition<T: PartialOrd>(data: &mut [T]) -> usize {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `example`
[INFO] [stderr]   --> src/quick_sort_slice.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | pub fn example() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `quick_sort`
[INFO] [stderr]  --> src/parallel_quick_sort.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn quick_sort<T: PartialOrd + std::marker::Send>(data: &mut [T]) {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `split_at_exclusive_mut`
[INFO] [stderr]   --> src/parallel_quick_sort.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | pub fn split_at_exclusive_mut<T>(data: &mut [T], p: usize) -> (&mut [T], &mut [T]) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `partition`
[INFO] [stderr]   --> src/parallel_quick_sort.rs:24:1
[INFO] [stderr]    |
[INFO] [stderr] 24 | fn partition<T: PartialOrd>(data: &mut [T]) -> usize {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `example`
[INFO] [stderr]   --> src/parallel_quick_sort.rs:39:1
[INFO] [stderr]    |
[INFO] [stderr] 39 | pub fn example() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `merge_sort`
[INFO] [stderr]  --> src/merge_sort.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | pub fn merge_sort<T: PartialOrd + Copy>(xs: &[T]) -> Vec<T> {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `merge`
[INFO] [stderr]   --> src/merge_sort.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | pub fn merge<T: PartialOrd + Copy>(mut left: &[T], mut right: &[T]) -> Vec<T> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `id`
[INFO] [stderr]  --> src/tricks.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn id<T>(x: T) -> T {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `Link`
[INFO] [stderr]  --> src/list.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | type Link<T> = Option<Box<Node<T>>>;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `back`
[INFO] [stderr]   --> src/list.rs:67:5
[INFO] [stderr]    |
[INFO] [stderr] 67 |     fn back(&mut self) -> &mut Link<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `back_id`
[INFO] [stderr]   --> src/list.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |     fn back_id(&mut self) -> &mut Link<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `back_tmp`
[INFO] [stderr]   --> src/list.rs:87:5
[INFO] [stderr]    |
[INFO] [stderr] 87 |     fn back_tmp(&mut self) -> &mut Link<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push_back`
[INFO] [stderr]   --> src/list.rs:99:5
[INFO] [stderr]    |
[INFO] [stderr] 99 |     pub fn push_back(&mut self, item: T) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push_back_rec`
[INFO] [stderr]    --> src/list.rs:112:5
[INFO] [stderr]     |
[INFO] [stderr] 112 |     pub fn push_back_rec(&mut self, item: T) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `append`
[INFO] [stderr]    --> src/list.rs:113:9
[INFO] [stderr]     |
[INFO] [stderr] 113 |         fn append<T>(node: &mut Option<Box<Node<T>>>, item: T) {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `example`
[INFO] [stderr]   --> src/quick_sort_slice.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | pub fn example() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `example`
[INFO] [stderr]   --> src/parallel_quick_sort.rs:39:1
[INFO] [stderr]    |
[INFO] [stderr] 39 | pub fn example() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.62s
[INFO] running `"docker" "inspect" "71aab35c0999e5dce3e3db7ee35859ad721e817078dcef82598009023b90e8c3"`
[INFO] running `"docker" "rm" "-f" "71aab35c0999e5dce3e3db7ee35859ad721e817078dcef82598009023b90e8c3"`
[INFO] [stdout] 71aab35c0999e5dce3e3db7ee35859ad721e817078dcef82598009023b90e8c3