[INFO] cloning repository https://github.com/subhdotsol/garbage-collector-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/subhdotsol/garbage-collector-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsubhdotsol%2Fgarbage-collector-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsubhdotsol%2Fgarbage-collector-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 889e840e4c994cbf41fe6ae938fe2ac4789e7da0
[INFO] checking subhdotsol/garbage-collector-rust against 49a6044d37d694890450f52ceaceb66277a36b1e for pr-161154
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsubhdotsol%2Fgarbage-collector-rust" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/subhdotsol/garbage-collector-rust
[INFO] finished tweaking git repo https://github.com/subhdotsol/garbage-collector-rust
[INFO] tweaked toml for git repo https://github.com/subhdotsol/garbage-collector-rust written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/subhdotsol/garbage-collector-rust on toolchain 49a6044d37d694890450f52ceaceb66277a36b1e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+49a6044d37d694890450f52ceaceb66277a36b1e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/subhdotsol/garbage-collector-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+49a6044d37d694890450f52ceaceb66277a36b1e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 44d36c8aae710a0664642a645136c3293d2d9f8cf525f2ba0fcdc1e5a69c9f8b
[INFO] running `Command { std: "docker" "start" "44d36c8aae710a0664642a645136c3293d2d9f8cf525f2ba0fcdc1e5a69c9f8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "44d36c8aae710a0664642a645136c3293d2d9f8cf525f2ba0fcdc1e5a69c9f8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "44d36c8aae710a0664642a645136c3293d2d9f8cf525f2ba0fcdc1e5a69c9f8b" "/opt/rustwide/cargo-home/bin/cargo" "+49a6044d37d694890450f52ceaceb66277a36b1e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "44d36c8aae710a0664642a645136c3293d2d9f8cf525f2ba0fcdc1e5a69c9f8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "44d36c8aae710a0664642a645136c3293d2d9f8cf525f2ba0fcdc1e5a69c9f8b" "/opt/rustwide/cargo-home/bin/cargo" "+49a6044d37d694890450f52ceaceb66277a36b1e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]     Checking garbage-collector-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `id`, `size`, `generation`, and `forwarding_ptr` are never read
[INFO] [stdout]   --> src/common/mod.rs:9:9
[INFO] [stdout]    |
[INFO] [stdout]  8 | pub struct Object {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout]  9 |     pub id: usize, // You can't use real memory addresses, so IDs are your pointers. When object A references object B, it stores B'...
[INFO] [stdout]    |         ^^
[INFO] [stdout] 10 |     pub size: usize, // Simulates that objects take up memory. Lets you track "how much memory is in use" and report meaningful stats.
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub generation: u8,                // for generation GC
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 20 |     pub forwarding_ptr: Option<usize>, // for cheney's algorithm
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id`, `size`, `generation`, and `forwarding_ptr` are never read
[INFO] [stdout]   --> src/common/mod.rs:9:9
[INFO] [stdout]    |
[INFO] [stdout]  8 | pub struct Object {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout]  9 |     pub id: usize, // You can't use real memory addresses, so IDs are your pointers. When object A references object B, it stores B'...
[INFO] [stdout]    |         ^^
[INFO] [stdout] 10 |     pub size: usize, // Simulates that objects take up memory. Lets you track "how much memory is in use" and report meaningful stats.
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub generation: u8,                // for generation GC
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 20 |     pub forwarding_ptr: Option<usize>, // for cheney's algorithm
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_object` is never used
[INFO] [stdout]   --> src/common/mod.rs:72:12
[INFO] [stdout]    |
[INFO] [stdout] 57 | impl Heap {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 72 |     pub fn get_object(&self, id: usize) -> Option<&Object> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_object` is never used
[INFO] [stdout]   --> src/common/mod.rs:72:12
[INFO] [stdout]    |
[INFO] [stdout] 57 | impl Heap {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 72 |     pub fn get_object(&self, id: usize) -> Option<&Object> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] running `Command { std: "docker" "inspect" "44d36c8aae710a0664642a645136c3293d2d9f8cf525f2ba0fcdc1e5a69c9f8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44d36c8aae710a0664642a645136c3293d2d9f8cf525f2ba0fcdc1e5a69c9f8b", kill_on_drop: false }`
[INFO] [stdout] 44d36c8aae710a0664642a645136c3293d2d9f8cf525f2ba0fcdc1e5a69c9f8b