[INFO] cloning repository https://github.com/Nazariglez/gc-mark-sweep-rs
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Nazariglez/gc-mark-sweep-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNazariglez%2Fgc-mark-sweep-rs"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNazariglez%2Fgc-mark-sweep-rs'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 173e2210757dc30f4e555215a625fe978727cbcb
[INFO] checking Nazariglez/gc-mark-sweep-rs against try#ea663bba38739867a4b75ac820991b4f5d093c3b for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNazariglez%2Fgc-mark-sweep-rs" "/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/Nazariglez/gc-mark-sweep-rs 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/Nazariglez/gc-mark-sweep-rs
[INFO] finished tweaking git repo https://github.com/Nazariglez/gc-mark-sweep-rs
[INFO] tweaked toml for git repo https://github.com/Nazariglez/gc-mark-sweep-rs written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/Nazariglez/gc-mark-sweep-rs 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-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" "+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] 7b6ecb68007575d678726bf6924e77887a437451fd0b1f35d39bf78a8d7bcabd
[INFO] running `"docker" "start" "-a" "7b6ecb68007575d678726bf6924e77887a437451fd0b1f35d39bf78a8d7bcabd"`
[INFO] [stderr]     Checking array-macro v1.0.2
[INFO] [stderr]     Checking gc-mark-sweep-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: use of deprecated item 'std::mem::uninitialized': use `mem::MaybeUninit` instead
[INFO] [stderr]   --> src/main.rs:66:20
[INFO] [stderr]    |
[INFO] [stderr] 66 |             stack: array![None; STACK_MAX],
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `STACK_MAX`
[INFO] [stderr]  --> src/main.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | const STACK_MAX:usize = 256;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `INITIAL_GC_THRESHOLD`
[INFO] [stderr]  --> src/main.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | const INITIAL_GC_THRESHOLD:usize = 10;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `RefObject`
[INFO] [stderr]   --> src/main.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | type RefObject = Rc<RefCell<Object>>;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Object`
[INFO] [stderr]   --> src/main.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | struct Object {
[INFO] [stderr]    | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/main.rs:21:5
[INFO] [stderr]    |
[INFO] [stderr] 21 |     fn new(typ: ObjectType) -> RefObject {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `mark`
[INFO] [stderr]   --> src/main.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     pub fn mark(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `ObjectType`
[INFO] [stderr]   --> src/main.rs:46:1
[INFO] [stderr]    |
[INFO] [stderr] 46 | enum ObjectType {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `VM`
[INFO] [stderr]   --> src/main.rs:54:1
[INFO] [stderr]    |
[INFO] [stderr] 54 | struct VM {
[INFO] [stderr]    | ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/main.rs:64:5
[INFO] [stderr]    |
[INFO] [stderr] 64 |     fn new() -> VM {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new_object`
[INFO] [stderr]   --> src/main.rs:74:5
[INFO] [stderr]    |
[INFO] [stderr] 74 |     fn new_object(&mut self, typ: ObjectType) -> RefObject {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `mark_all`
[INFO] [stderr]   --> src/main.rs:82:5
[INFO] [stderr]    |
[INFO] [stderr] 82 |     fn mark_all(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `sweep`
[INFO] [stderr]   --> src/main.rs:91:5
[INFO] [stderr]    |
[INFO] [stderr] 91 |     fn sweep(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `gc`
[INFO] [stderr]    --> src/main.rs:106:5
[INFO] [stderr]     |
[INFO] [stderr] 106 |     fn gc(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push`
[INFO] [stderr]    --> src/main.rs:115:5
[INFO] [stderr]     |
[INFO] [stderr] 115 |     fn push(&mut self, val:RefObject) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `pop`
[INFO] [stderr]    --> src/main.rs:124:5
[INFO] [stderr]     |
[INFO] [stderr] 124 |     fn pop(&mut self) -> RefObject {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push_int`
[INFO] [stderr]    --> src/main.rs:133:5
[INFO] [stderr]     |
[INFO] [stderr] 133 |     fn push_int(&mut self, val: i32) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push_pair`
[INFO] [stderr]    --> src/main.rs:138:5
[INFO] [stderr]     |
[INFO] [stderr] 138 |     fn push_pair(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::mem::uninitialized': use `mem::MaybeUninit` instead
[INFO] [stderr]   --> src/main.rs:66:20
[INFO] [stderr]    |
[INFO] [stderr] 66 |             stack: array![None; STACK_MAX],
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.62s
[INFO] running `"docker" "inspect" "7b6ecb68007575d678726bf6924e77887a437451fd0b1f35d39bf78a8d7bcabd"`
[INFO] running `"docker" "rm" "-f" "7b6ecb68007575d678726bf6924e77887a437451fd0b1f35d39bf78a8d7bcabd"`
[INFO] [stdout] 7b6ecb68007575d678726bf6924e77887a437451fd0b1f35d39bf78a8d7bcabd