[INFO] fetching crate rb_tree 0.2.0...
[INFO] checking rb_tree-0.2.0 against beta for pr-78714
[INFO] extracting crate rb_tree 0.2.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate rb_tree 0.2.0 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rb_tree 0.2.0
[INFO] finished tweaking crates.io crate rb_tree 0.2.0
[INFO] tweaked toml for crates.io crate rb_tree 0.2.0 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 14668e34df062cc9caa466661c8eabcd441e8568b1f1bb107a87f245cf2f3f6e
[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" "14668e34df062cc9caa466661c8eabcd441e8568b1f1bb107a87f245cf2f3f6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "14668e34df062cc9caa466661c8eabcd441e8568b1f1bb107a87f245cf2f3f6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14668e34df062cc9caa466661c8eabcd441e8568b1f1bb107a87f245cf2f3f6e", kill_on_drop: false }`
[INFO] [stdout] 14668e34df062cc9caa466661c8eabcd441e8568b1f1bb107a87f245cf2f3f6e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "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] aff2695df4896aa530479441553c4281c677d38be062b8cbf78731991d26cd02
[INFO] running `Command { std: "docker" "start" "-a" "aff2695df4896aa530479441553c4281c677d38be062b8cbf78731991d26cd02", kill_on_drop: false }`
[INFO] [stderr]     Checking rb_tree v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/rbtree.rs:678:13
[INFO] [stdout]     |
[INFO] [stdout] 678 |             'right: while let Some(vr) = self.nextr {
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/rbtree.rs:715:13
[INFO] [stdout]     |
[INFO] [stdout] 715 |             'right: while let Some(vr) = self.nextr {
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/rbtree.rs:763:13
[INFO] [stdout]     |
[INFO] [stdout] 763 |             'right: while let Some(vr) = self.nextr {
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/rbtree.rs:801:13
[INFO] [stdout]     |
[INFO] [stdout] 801 |             'right: while let Some(vr) = self.nextr {
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/rbtree.rs:678:13
[INFO] [stdout]     |
[INFO] [stdout] 678 |             'right: while let Some(vr) = self.nextr {
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/rbtree.rs:715:13
[INFO] [stdout]     |
[INFO] [stdout] 715 |             'right: while let Some(vr) = self.nextr {
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/rbtree.rs:763:13
[INFO] [stdout]     |
[INFO] [stdout] 763 |             'right: while let Some(vr) = self.nextr {
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/rbtree.rs:801:13
[INFO] [stdout]     |
[INFO] [stdout] 801 |             'right: while let Some(vr) = self.nextr {
[INFO] [stdout]     |             ^^^^^^
[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 1.98s
[INFO] running `Command { std: "docker" "inspect" "aff2695df4896aa530479441553c4281c677d38be062b8cbf78731991d26cd02", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aff2695df4896aa530479441553c4281c677d38be062b8cbf78731991d26cd02", kill_on_drop: false }`
[INFO] [stdout] aff2695df4896aa530479441553c4281c677d38be062b8cbf78731991d26cd02