[INFO] cloning repository https://github.com/varzac/rust_collections
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/varzac/rust_collections" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvarzac%2Frust_collections"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvarzac%2Frust_collections'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] db1285199d9300d32cdd25281583753dc1de814d
[INFO] checking varzac/rust_collections against master#b61e69433951e31f7bd746e22f516a48ad41623b for prs-64470-and-65389
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvarzac%2Frust_collections" "/workspace/builds/worker-6/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/varzac/rust_collections on toolchain b61e69433951e31f7bd746e22f516a48ad41623b
[INFO] running `"/workspace/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/varzac/rust_collections
[INFO] finished tweaking git repo https://github.com/varzac/rust_collections
[INFO] tweaked toml for git repo https://github.com/varzac/rust_collections written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/varzac/rust_collections already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] warning: path `/workspace/builds/worker-6/source/src/linked_list.rs` was erroneously implicitly accepted for binary `linked_list`,
[INFO] [stderr] please set bin.path in Cargo.toml
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+b61e69433951e31f7bd746e22f516a48ad41623b" "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] 6bf483ec6d2e98f36d745fdb0ed9fee4180eaebe62aa2a5fa091cd4dff6f54d7
[INFO] running `"docker" "start" "-a" "6bf483ec6d2e98f36d745fdb0ed9fee4180eaebe62aa2a5fa091cd4dff6f54d7"`
[INFO] [stderr] warning: path `/opt/rustwide/workdir/src/linked_list.rs` was erroneously implicitly accepted for binary `linked_list`,
[INFO] [stderr] please set bin.path in Cargo.toml
[INFO] [stderr]     Checking linked_list v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: method is never used: `delete_val`
[INFO] [stderr]   --> src/linked_list.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fn delete_val(&self, val: &T) -> Option<Rc<LinkedList<T>>> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `insert_val`
[INFO] [stderr]   --> src/linked_list.rs:38:5
[INFO] [stderr]    |
[INFO] [stderr] 38 |     fn insert_val(&self, val: T) -> LinkedList<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `length`
[INFO] [stderr]   --> src/linked_list.rs:42:5
[INFO] [stderr]    |
[INFO] [stderr] 42 |     fn length(&self) -> i32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `find`
[INFO] [stderr]   --> src/linked_list.rs:66:5
[INFO] [stderr]    |
[INFO] [stderr] 66 |     fn find(&self, val: T) -> Option<i32> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.44s
[INFO] running `"docker" "inspect" "6bf483ec6d2e98f36d745fdb0ed9fee4180eaebe62aa2a5fa091cd4dff6f54d7"`
[INFO] running `"docker" "rm" "-f" "6bf483ec6d2e98f36d745fdb0ed9fee4180eaebe62aa2a5fa091cd4dff6f54d7"`
[INFO] [stdout] 6bf483ec6d2e98f36d745fdb0ed9fee4180eaebe62aa2a5fa091cd4dff6f54d7