[INFO] updating cached repository https://github.com/T-parrish/rust_study_materials
[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] [stderr] From https://github.com/T-parrish/rust_study_materials
[INFO] [stderr]    2bbbcd2..2e976f6  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2e976f6f0faaafc731ff27f5175d0a6e9c408cb0
[INFO] checking T-parrish/rust_study_materials against master#7c59a81a5fcbaaca311f744cd7c68d99bfbb05d3 for pr-71873
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FT-parrish%2Frust_study_materials" "/workspace/builds/worker-7/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/T-parrish/rust_study_materials on toolchain 7c59a81a5fcbaaca311f744cd7c68d99bfbb05d3
[INFO] running `"/workspace/cargo-home/bin/cargo" "+7c59a81a5fcbaaca311f744cd7c68d99bfbb05d3" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/T-parrish/rust_study_materials
[INFO] finished tweaking git repo https://github.com/T-parrish/rust_study_materials
[INFO] tweaked toml for git repo https://github.com/T-parrish/rust_study_materials written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/T-parrish/rust_study_materials already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+7c59a81a5fcbaaca311f744cd7c68d99bfbb05d3" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+7c59a81a5fcbaaca311f744cd7c68d99bfbb05d3" "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] 53e0549913799f8a942f2f4504a448e30da6fb301d0c35cd629eb8bbe8c64af3
[INFO] running `"docker" "start" "-a" "53e0549913799f8a942f2f4504a448e30da6fb301d0c35cd629eb8bbe8c64af3"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling libc v0.2.70
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking solved_problems v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/linked_list.rs:16:8
[INFO] [stderr]    |
[INFO] [stderr] 16 |     fn new() -> Self {
[INFO] [stderr]    |        ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `push`
[INFO] [stderr]   --> src/linked_list.rs:20:8
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn push(&mut self, data: T) {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `peek`
[INFO] [stderr]   --> src/linked_list.rs:39:8
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn peek(&self) -> Option<&T> {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `peek_mut`
[INFO] [stderr]   --> src/linked_list.rs:44:8
[INFO] [stderr]    |
[INFO] [stderr] 44 |     fn peek_mut(&mut self) -> Option<&mut T> {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `into_iter`
[INFO] [stderr]   --> src/linked_list.rs:71:8
[INFO] [stderr]    |
[INFO] [stderr] 71 |     fn into_iter(self) -> IntoIter<T> {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `iter`
[INFO] [stderr]   --> src/linked_list.rs:91:8
[INFO] [stderr]    |
[INFO] [stderr] 91 |     fn iter(&mut self) -> Iter<T> {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `iter_mut`
[INFO] [stderr]    --> src/linked_list.rs:116:8
[INFO] [stderr]     |
[INFO] [stderr] 116 |     fn iter_mut(&mut self) -> IterMut<T> {
[INFO] [stderr]     |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.46s
[INFO] running `"docker" "inspect" "53e0549913799f8a942f2f4504a448e30da6fb301d0c35cd629eb8bbe8c64af3"`
[INFO] running `"docker" "rm" "-f" "53e0549913799f8a942f2f4504a448e30da6fb301d0c35cd629eb8bbe8c64af3"`
[INFO] [stdout] 53e0549913799f8a942f2f4504a448e30da6fb301d0c35cd629eb8bbe8c64af3