[INFO] updating cached repository https://github.com/marior765/GC
[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] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9fffe66fb340c3eebc081c15c7db265f35e3a691
[INFO] checking marior765/GC against try#ea663bba38739867a4b75ac820991b4f5d093c3b for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarior765%2FGC" "/workspace/builds/worker-13/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/marior765/GC on toolchain ea663bba38739867a4b75ac820991b4f5d093c3b
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/marior765/GC
[INFO] finished tweaking git repo https://github.com/marior765/GC
[INFO] tweaked toml for git repo https://github.com/marior765/GC written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/marior765/GC already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "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] d73e967eaade6257fd5b7f2228c31852d81ec66bff5a73c0769a49a78df7dd79
[INFO] running `"docker" "start" "-a" "d73e967eaade6257fd5b7f2228c31852d81ec66bff5a73c0769a49a78df7dd79"`
[INFO] [stderr]     Checking gc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `j`
[INFO] [stderr]    --> src/main.rs:239:13
[INFO] [stderr]     |
[INFO] [stderr] 239 |         for j in 0..20 {
[INFO] [stderr]     |             ^ help: consider prefixing with an underscore: `_j`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `k`
[INFO] [stderr]    --> src/main.rs:242:13
[INFO] [stderr]     |
[INFO] [stderr] 242 |         for k in 0..20 {
[INFO] [stderr]     |             ^ help: consider prefixing with an underscore: `_k`
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `STACK_MAX_SIZE`
[INFO] [stderr]   --> src/main.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | const STACK_MAX_SIZE: usize = 526;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `StackLink`
[INFO] [stderr]   --> src/main.rs:17:1
[INFO] [stderr]    |
[INFO] [stderr] 17 | type StackLink = Rc<RefCell<Vec<SingleLink>>>;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `mark`
[INFO] [stderr]    --> src/main.rs:104:5
[INFO] [stderr]     |
[INFO] [stderr] 104 |     pub fn mark<'a>(&mut self, item: &'a mut Object) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `j`
[INFO] [stderr]    --> src/main.rs:239:13
[INFO] [stderr]     |
[INFO] [stderr] 239 |         for j in 0..20 {
[INFO] [stderr]     |             ^ help: consider prefixing with an underscore: `_j`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `k`
[INFO] [stderr]    --> src/main.rs:242:13
[INFO] [stderr]     |
[INFO] [stderr] 242 |         for k in 0..20 {
[INFO] [stderr]     |             ^ help: consider prefixing with an underscore: `_k`
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `STACK_MAX_SIZE`
[INFO] [stderr]   --> src/main.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | const STACK_MAX_SIZE: usize = 526;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `StackLink`
[INFO] [stderr]   --> src/main.rs:17:1
[INFO] [stderr]    |
[INFO] [stderr] 17 | type StackLink = Rc<RefCell<Vec<SingleLink>>>;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `mark`
[INFO] [stderr]    --> src/main.rs:104:5
[INFO] [stderr]     |
[INFO] [stderr] 104 |     pub fn mark<'a>(&mut self, item: &'a mut Object) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.07s
[INFO] running `"docker" "inspect" "d73e967eaade6257fd5b7f2228c31852d81ec66bff5a73c0769a49a78df7dd79"`
[INFO] running `"docker" "rm" "-f" "d73e967eaade6257fd5b7f2228c31852d81ec66bff5a73c0769a49a78df7dd79"`
[INFO] [stdout] d73e967eaade6257fd5b7f2228c31852d81ec66bff5a73c0769a49a78df7dd79