[INFO] fetching crate rb_tree 0.2.0...
[INFO] checking rb_tree-0.2.0 against master#a874956d940ecb3ed524b6176a171219ac4787ea for pr-76104
[INFO] extracting crate rb_tree 0.2.0 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate rb_tree 0.2.0 on toolchain a874956d940ecb3ed524b6176a171219ac4787ea
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a874956d940ecb3ed524b6176a171219ac4787ea" "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-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a874956d940ecb3ed524b6176a171219ac4787ea" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a874956d940ecb3ed524b6176a171219ac4787ea" "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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+a874956d940ecb3ed524b6176a171219ac4787ea" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a2e2d7f227f28a44c5d54270888a9db7ff5d9b432d8af1ba9c30ffefafe62661
[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" "a2e2d7f227f28a44c5d54270888a9db7ff5d9b432d8af1ba9c30ffefafe62661", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a2e2d7f227f28a44c5d54270888a9db7ff5d9b432d8af1ba9c30ffefafe62661", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a2e2d7f227f28a44c5d54270888a9db7ff5d9b432d8af1ba9c30ffefafe62661", kill_on_drop: false }`
[INFO] [stdout] a2e2d7f227f28a44c5d54270888a9db7ff5d9b432d8af1ba9c30ffefafe62661
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+a874956d940ecb3ed524b6176a171219ac4787ea" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 96371ca07c8c00ad94e00eab4210b31610d15f7a2d163c7a8df5611ecddbdf67
[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" "96371ca07c8c00ad94e00eab4210b31610d15f7a2d163c7a8df5611ecddbdf67", 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 1.90s
[INFO] running `Command { std: "docker" "inspect" "96371ca07c8c00ad94e00eab4210b31610d15f7a2d163c7a8df5611ecddbdf67", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "96371ca07c8c00ad94e00eab4210b31610d15f7a2d163c7a8df5611ecddbdf67", kill_on_drop: false }`
[INFO] [stdout] 96371ca07c8c00ad94e00eab4210b31610d15f7a2d163c7a8df5611ecddbdf67