[INFO] updating cached repository https://github.com/ickshonpe/rust-data-structures
[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] af0bf8f5e24687dad2a324e4518931fdbad50590
[INFO] testing ickshonpe/rust-data-structures against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fickshonpe%2Frust-data-structures" "work/builds/worker-4/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ickshonpe/rust-data-structures 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/ickshonpe/rust-data-structures
[INFO] finished tweaking git repo https://github.com/ickshonpe/rust-data-structures
[INFO] tweaked toml for git repo https://github.com/ickshonpe/rust-data-structures written to work/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/ickshonpe/rust-data-structures 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-4/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-4/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] 68ec5271d5e33a56b013d47f31e20048768c834ed1659e179d605d657fbb8897
[INFO] running `"docker" "start" "-a" "68ec5271d5e33a56b013d47f31e20048768c834ed1659e179d605d657fbb8897"`
[INFO] [stderr]    Compiling data-structures v0.1.0 (/opt/rustwide/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: 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: 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]     Finished dev [unoptimized + debuginfo] target(s) in 1.36s
[INFO] running `"docker" "inspect" "68ec5271d5e33a56b013d47f31e20048768c834ed1659e179d605d657fbb8897"`
[INFO] running `"docker" "rm" "-f" "68ec5271d5e33a56b013d47f31e20048768c834ed1659e179d605d657fbb8897"`
[INFO] [stdout] 68ec5271d5e33a56b013d47f31e20048768c834ed1659e179d605d657fbb8897
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-4/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] dcf608d7916428eafd4590ecdc8b3b3849a92f5df761c13c14d30f244f980db4
[INFO] running `"docker" "start" "-a" "dcf608d7916428eafd4590ecdc8b3b3849a92f5df761c13c14d30f244f980db4"`
[INFO] [stderr]    Compiling data-structures v0.1.0 (/opt/rustwide/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: variable does not need to be mutable
[INFO] [stderr]    --> src/list.rs:239:17
[INFO] [stderr]     |
[INFO] [stderr] 239 |             let mut n = list.peek_mut().unwrap();
[INFO] [stderr]     |                 ----^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[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: 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 0.97s
[INFO] running `"docker" "inspect" "dcf608d7916428eafd4590ecdc8b3b3849a92f5df761c13c14d30f244f980db4"`
[INFO] running `"docker" "rm" "-f" "dcf608d7916428eafd4590ecdc8b3b3849a92f5df761c13c14d30f244f980db4"`
[INFO] [stdout] dcf608d7916428eafd4590ecdc8b3b3849a92f5df761c13c14d30f244f980db4
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-4/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] cd6adae26d9ed62676ff0fa07e54dd7e4e9d24e779f104ec5a52e5745ee188c1
[INFO] running `"docker" "start" "-a" "cd6adae26d9ed62676ff0fa07e54dd7e4e9d24e779f104ec5a52e5745ee188c1"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/data_structures-2cf188f03cd0fd00
[INFO] [stdout] 
[INFO] [stdout] running 9 tests
[INFO] [stdout] test list::test_len ... ok
[INFO] [stdout] test parallel_quick_sort::test_2 ... ok
[INFO] [stdout] test quick_sort_slice::test_2 ... ok
[INFO] [stdout] test parallel_quick_sort::test_1 ... ok
[INFO] [stdout] test quick_sort::test_2 ... ok
[INFO] [stdout] test quick_sort::test_1 ... ok
[INFO] [stdout] test quick_sort_slice::test_1 ... ok
[INFO] [stdout] test list::test_2 ... ok
[INFO] [stdout] test list::test_1 ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "cd6adae26d9ed62676ff0fa07e54dd7e4e9d24e779f104ec5a52e5745ee188c1"`
[INFO] running `"docker" "rm" "-f" "cd6adae26d9ed62676ff0fa07e54dd7e4e9d24e779f104ec5a52e5745ee188c1"`
[INFO] [stdout] cd6adae26d9ed62676ff0fa07e54dd7e4e9d24e779f104ec5a52e5745ee188c1