[INFO] cloning repository https://github.com/atsmtat/lox-vm
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/atsmtat/lox-vm" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fatsmtat%2Flox-vm", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fatsmtat%2Flox-vm'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 53295e1b70701b684c3b53b5178b8c0d574f505b
[INFO] checking atsmtat/lox-vm against try#55b3f428b4fac6790b1e8492e0b91ff2d80aec7c for pr-77035
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fatsmtat%2Flox-vm" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/atsmtat/lox-vm on toolchain 55b3f428b4fac6790b1e8492e0b91ff2d80aec7c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+55b3f428b4fac6790b1e8492e0b91ff2d80aec7c" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/atsmtat/lox-vm
[INFO] finished tweaking git repo https://github.com/atsmtat/lox-vm
[INFO] tweaked toml for git repo https://github.com/atsmtat/lox-vm written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/atsmtat/lox-vm already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+55b3f428b4fac6790b1e8492e0b91ff2d80aec7c" "fetch" "--locked" "--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-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+55b3f428b4fac6790b1e8492e0b91ff2d80aec7c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] edf4f999df175a1a7800695d771f1fe9e5b94cfc6374453b6e9a40e58392375e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "edf4f999df175a1a7800695d771f1fe9e5b94cfc6374453b6e9a40e58392375e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "edf4f999df175a1a7800695d771f1fe9e5b94cfc6374453b6e9a40e58392375e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "edf4f999df175a1a7800695d771f1fe9e5b94cfc6374453b6e9a40e58392375e", kill_on_drop: false }`
[INFO] [stdout] edf4f999df175a1a7800695d771f1fe9e5b94cfc6374453b6e9a40e58392375e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+55b3f428b4fac6790b1e8492e0b91ff2d80aec7c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 261783c31f43c8a4f9eee0219b4cfb3304577bd196021d48a9c2112ee2bcef68
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "261783c31f43c8a4f9eee0219b4cfb3304577bd196021d48a9c2112ee2bcef68", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking lox-vm v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `head`
[INFO] [stdout]  --> src/memory.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     head: Option<NonNull<GcBox<dyn Object>>>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `allocate`
[INFO] [stdout]   --> src/memory.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub fn allocate<T: Object>(&mut self, val: T) -> Gc<T> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `next`
[INFO] [stdout]   --> src/memory.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     next: Option<NonNull<GcBox<dyn Object>>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `marked`
[INFO] [stdout]   --> src/memory.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 |     marked: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `header`
[INFO] [stdout]   --> src/memory.rs:49:5
[INFO] [stdout]    |
[INFO] [stdout] 49 |     header : GcBoxHeader,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]   --> src/memory.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 |     value : T,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/memory.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 |     fn new( value: T ) -> NonNull<Self> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]   --> src/memory.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 |     fn value(&self) -> &T {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `String`
[INFO] [stdout]   --> src/value.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     String(Gc<StrObj>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Or`
[INFO] [stdout]   --> src/compiler.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     Or,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `And`
[INFO] [stdout]   --> src/compiler.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     And,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Call`
[INFO] [stdout]   --> src/compiler.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     Call,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Primary`
[INFO] [stdout]   --> src/compiler.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 |     Primary
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `heap`
[INFO] [stdout]   --> src/vm.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     heap: Heap,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/main.rs:17:2
[INFO] [stdout]    |
[INFO] [stdout] 17 |     vm.run();
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `head`
[INFO] [stdout]  --> src/memory.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     head: Option<NonNull<GcBox<dyn Object>>>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `allocate`
[INFO] [stdout]   --> src/memory.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub fn allocate<T: Object>(&mut self, val: T) -> Gc<T> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `next`
[INFO] [stdout]   --> src/memory.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     next: Option<NonNull<GcBox<dyn Object>>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `marked`
[INFO] [stdout]   --> src/memory.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 |     marked: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `header`
[INFO] [stdout]   --> src/memory.rs:49:5
[INFO] [stdout]    |
[INFO] [stdout] 49 |     header : GcBoxHeader,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]   --> src/memory.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 |     value : T,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/memory.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 |     fn new( value: T ) -> NonNull<Self> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]   --> src/memory.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 |     fn value(&self) -> &T {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `String`
[INFO] [stdout]   --> src/value.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     String(Gc<StrObj>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Or`
[INFO] [stdout]   --> src/compiler.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     Or,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `And`
[INFO] [stdout]   --> src/compiler.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     And,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Call`
[INFO] [stdout]   --> src/compiler.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     Call,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Primary`
[INFO] [stdout]   --> src/compiler.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 |     Primary
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `heap`
[INFO] [stdout]   --> src/vm.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     heap: Heap,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/main.rs:17:2
[INFO] [stdout]    |
[INFO] [stdout] 17 |     vm.run();
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.70s
[INFO] running `Command { std: "docker" "inspect" "261783c31f43c8a4f9eee0219b4cfb3304577bd196021d48a9c2112ee2bcef68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "261783c31f43c8a4f9eee0219b4cfb3304577bd196021d48a9c2112ee2bcef68", kill_on_drop: false }`
[INFO] [stdout] 261783c31f43c8a4f9eee0219b4cfb3304577bd196021d48a9c2112ee2bcef68