[INFO] updating cached repository https://github.com/ameernormie/rust_lang_concepts
[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/ameernormie/rust_lang_concepts
[INFO] [stderr]    d25c841..3009d45  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3009d45b3441c5738e97f7a92dc09327b441e610
[INFO] checking ameernormie/rust_lang_concepts against master#6d69caba110c0c2fb90180df1cbc8be5033b91d4 for pr-69530
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fameernormie%2Frust_lang_concepts" "/workspace/builds/worker-12/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ameernormie/rust_lang_concepts on toolchain 6d69caba110c0c2fb90180df1cbc8be5033b91d4
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6d69caba110c0c2fb90180df1cbc8be5033b91d4" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/ameernormie/rust_lang_concepts
[INFO] finished tweaking git repo https://github.com/ameernormie/rust_lang_concepts
[INFO] tweaked toml for git repo https://github.com/ameernormie/rust_lang_concepts written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/ameernormie/rust_lang_concepts already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6d69caba110c0c2fb90180df1cbc8be5033b91d4" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+6d69caba110c0c2fb90180df1cbc8be5033b91d4" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 56f1fe82a0974d038f25e42ab9ab4734b9d2d7197aefa76d0fb47c8bf4b6ecfb
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "56f1fe82a0974d038f25e42ab9ab4734b9d2d7197aefa76d0fb47c8bf4b6ecfb"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Checking rust_lang_concepts v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: struct is never constructed: `LimitTracker`
[INFO] [stderr]   --> src/smart_pointers.rs:73:12
[INFO] [stderr]    |
[INFO] [stderr] 73 | pub struct LimitTracker<'a, T: Messenger> {
[INFO] [stderr]    |            ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/smart_pointers.rs:83:5
[INFO] [stderr]    |
[INFO] [stderr] 83 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `set_value`
[INFO] [stderr]   --> src/smart_pointers.rs:91:5
[INFO] [stderr]    |
[INFO] [stderr] 91 |     pub fn set_value(&mut self, value: usize) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v1`
[INFO] [stderr]   --> src/closures.rs:90:9
[INFO] [stderr]    |
[INFO] [stderr] 90 |     let v1 = c.value(1);
[INFO] [stderr]    |         ^^ help: consider prefixing with an underscore: `_v1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.61s
[INFO] running `"docker" "inspect" "56f1fe82a0974d038f25e42ab9ab4734b9d2d7197aefa76d0fb47c8bf4b6ecfb"`
[INFO] running `"docker" "rm" "-f" "56f1fe82a0974d038f25e42ab9ab4734b9d2d7197aefa76d0fb47c8bf4b6ecfb"`
[INFO] [stdout] 56f1fe82a0974d038f25e42ab9ab4734b9d2d7197aefa76d0fb47c8bf4b6ecfb