[INFO] cloning repository https://github.com/marior765/GC
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/marior765/GC" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarior765%2FGC", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarior765%2FGC'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e4c812d7af62bee730cf462b7a77cd006b38d6a5
[INFO] checking marior765/GC against master#fc81ad22c453776de16acf9938976930cf8c9401 for pr-77325
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarior765%2FGC" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/marior765/GC on toolchain fc81ad22c453776de16acf9938976930cf8c9401
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+fc81ad22c453776de16acf9938976930cf8c9401" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-11/source/Cargo.toml
[INFO] crate git repo https://github.com/marior765/GC already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+fc81ad22c453776de16acf9938976930cf8c9401" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+fc81ad22c453776de16acf9938976930cf8c9401" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d3b9753a4d81f81265bcbe21f620c23b8c327aefd6385bec7a99d49ce330ee1c
[INFO] running `Command { std: "docker" "start" "-a" "d3b9753a4d81f81265bcbe21f620c23b8c327aefd6385bec7a99d49ce330ee1c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d3b9753a4d81f81265bcbe21f620c23b8c327aefd6385bec7a99d49ce330ee1c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d3b9753a4d81f81265bcbe21f620c23b8c327aefd6385bec7a99d49ce330ee1c", kill_on_drop: false }`
[INFO] [stdout] d3b9753a4d81f81265bcbe21f620c23b8c327aefd6385bec7a99d49ce330ee1c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+fc81ad22c453776de16acf9938976930cf8c9401" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 335fab3c5a225e09f76232bdb22a202afbc81f195235eed730eece88fbc1ff87
[INFO] running `Command { std: "docker" "start" "-a" "335fab3c5a225e09f76232bdb22a202afbc81f195235eed730eece88fbc1ff87", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking gc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]    --> src/main.rs:251:13
[INFO] [stdout]     |
[INFO] [stdout] 251 |         for j in 0..20 {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]    --> src/main.rs:254:13
[INFO] [stdout]     |
[INFO] [stdout] 254 |         for k in 0..20 {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `STACK_MAX_SIZE`
[INFO] [stdout]   --> src/main.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | const STACK_MAX_SIZE: usize = 256;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `StackLink`
[INFO] [stdout]   --> src/main.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | type StackLink = Rc<RefCell<Vec<SingleLink>>>;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mark`
[INFO] [stdout]    --> src/main.rs:105:12
[INFO] [stdout]     |
[INFO] [stdout] 105 |     pub fn mark(&mut self, item: &mut Object) {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]    --> src/main.rs:251:13
[INFO] [stdout]     |
[INFO] [stdout] 251 |         for j in 0..20 {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]    --> src/main.rs:254:13
[INFO] [stdout]     |
[INFO] [stdout] 254 |         for k in 0..20 {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `STACK_MAX_SIZE`
[INFO] [stdout]   --> src/main.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | const STACK_MAX_SIZE: usize = 256;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `StackLink`
[INFO] [stdout]   --> src/main.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | type StackLink = Rc<RefCell<Vec<SingleLink>>>;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mark`
[INFO] [stdout]    --> src/main.rs:105:12
[INFO] [stdout]     |
[INFO] [stdout] 105 |     pub fn mark(&mut self, item: &mut Object) {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.18s
[INFO] running `Command { std: "docker" "inspect" "335fab3c5a225e09f76232bdb22a202afbc81f195235eed730eece88fbc1ff87", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "335fab3c5a225e09f76232bdb22a202afbc81f195235eed730eece88fbc1ff87", kill_on_drop: false }`
[INFO] [stdout] 335fab3c5a225e09f76232bdb22a202afbc81f195235eed730eece88fbc1ff87