[INFO] fetching crate marksweep 0.1.0...
[INFO] checking marksweep-0.1.0 against master#39b841dfe36f90a7cd111e7f0c55f32594f6e578 for pr-77035
[INFO] extracting crate marksweep 0.1.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate marksweep 0.1.0 on toolchain 39b841dfe36f90a7cd111e7f0c55f32594f6e578
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate marksweep 0.1.0
[INFO] finished tweaking crates.io crate marksweep 0.1.0
[INFO] tweaked toml for crates.io crate marksweep 0.1.0 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2edf98c4af71056605c1058bce4c7e63e2bc90b4bbedae6ed6a377439d53c17b
[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" "2edf98c4af71056605c1058bce4c7e63e2bc90b4bbedae6ed6a377439d53c17b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2edf98c4af71056605c1058bce4c7e63e2bc90b4bbedae6ed6a377439d53c17b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2edf98c4af71056605c1058bce4c7e63e2bc90b4bbedae6ed6a377439d53c17b", kill_on_drop: false }`
[INFO] [stdout] 2edf98c4af71056605c1058bce4c7e63e2bc90b4bbedae6ed6a377439d53c17b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b10e37632a9dfd97def721ea2263aef1de77fea7beb9f4ddc297b726de3a204f
[INFO] running `Command { std: "docker" "start" "-a" "b10e37632a9dfd97def721ea2263aef1de77fea7beb9f4ddc297b726de3a204f", kill_on_drop: false }`
[INFO] [stderr]     Checking marksweep v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/lib.rs:17:38
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn is_root_changes<T: MarkSweep>(x: &T) {
[INFO] [stdout]    |                                      ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/lib.rs:21:27
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn init<T: MarkSweep>(x: &T) {
[INFO] [stdout]    |                           ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/lib.rs:17:38
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn is_root_changes<T: MarkSweep>(x: &T) {
[INFO] [stdout]    |                                      ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/lib.rs:21:27
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn init<T: MarkSweep>(x: &T) {
[INFO] [stdout]    |                           ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static variable `root_set` should have an upper case name
[INFO] [stdout]   --> src/lib.rs:65:16
[INFO] [stdout]    |
[INFO] [stdout] 65 |     static ref root_set: Mutex<HashSet<Element>> = Mutex::new(HashSet::new());
[INFO] [stdout]    |                ^^^^^^^^ help: convert the identifier to upper case: `ROOT_SET`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static variable `not_root_set` should have an upper case name
[INFO] [stdout]   --> src/lib.rs:66:16
[INFO] [stdout]    |
[INFO] [stdout] 66 |     static ref not_root_set: Mutex<HashSet<Element>> = Mutex::new(HashSet::new());
[INFO] [stdout]    |                ^^^^^^^^^^^^ help: convert the identifier to upper case: `NOT_ROOT_SET`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static variable `root_set` should have an upper case name
[INFO] [stdout]   --> src/lib.rs:65:16
[INFO] [stdout]    |
[INFO] [stdout] 65 |     static ref root_set: Mutex<HashSet<Element>> = Mutex::new(HashSet::new());
[INFO] [stdout]    |                ^^^^^^^^ help: convert the identifier to upper case: `ROOT_SET`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static variable `not_root_set` should have an upper case name
[INFO] [stdout]   --> src/lib.rs:66:16
[INFO] [stdout]    |
[INFO] [stdout] 66 |     static ref not_root_set: Mutex<HashSet<Element>> = Mutex::new(HashSet::new());
[INFO] [stdout]    |                ^^^^^^^^^^^^ help: convert the identifier to upper case: `NOT_ROOT_SET`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.54s
[INFO] running `Command { std: "docker" "inspect" "b10e37632a9dfd97def721ea2263aef1de77fea7beb9f4ddc297b726de3a204f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b10e37632a9dfd97def721ea2263aef1de77fea7beb9f4ddc297b726de3a204f", kill_on_drop: false }`
[INFO] [stdout] b10e37632a9dfd97def721ea2263aef1de77fea7beb9f4ddc297b726de3a204f