[INFO] fetching crate bagofholding 0.1.0...
[INFO] checking bagofholding-0.1.0 against master#d62d3f7fa9a91d933213cc10e20e740608983f64 for pr-77015
[INFO] extracting crate bagofholding 0.1.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate bagofholding 0.1.0 on toolchain d62d3f7fa9a91d933213cc10e20e740608983f64
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate bagofholding 0.1.0
[INFO] finished tweaking crates.io crate bagofholding 0.1.0
[INFO] tweaked toml for crates.io crate bagofholding 0.1.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f0b74f68ebcc5e62ec71c615f2dd4645c03f968fc5d6566263ca9714ef807525
[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" "f0b74f68ebcc5e62ec71c615f2dd4645c03f968fc5d6566263ca9714ef807525", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f0b74f68ebcc5e62ec71c615f2dd4645c03f968fc5d6566263ca9714ef807525", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f0b74f68ebcc5e62ec71c615f2dd4645c03f968fc5d6566263ca9714ef807525", kill_on_drop: false }`
[INFO] [stdout] f0b74f68ebcc5e62ec71c615f2dd4645c03f968fc5d6566263ca9714ef807525
[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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "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] 5719efeea08be288fa6b24bd1d22ff5e0aac89ec9fc5f873f6c79ff1e376028b
[INFO] running `Command { std: "docker" "start" "-a" "5719efeea08be288fa6b24bd1d22ff5e0aac89ec9fc5f873f6c79ff1e376028b", kill_on_drop: false }`
[INFO] [stderr]     Checking bagofholding v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]    --> src/bst/tree_node.rs:165:30
[INFO] [stdout]     |
[INFO] [stdout] 165 |             Self::Internal { data, left, right } => {
[INFO] [stdout]     |                              ^^^^ help: try ignoring the field: `data: _`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]    --> src/bst/tree_node.rs:165:30
[INFO] [stdout]     |
[INFO] [stdout] 165 |             Self::Internal { data, left, right } => {
[INFO] [stdout]     |                              ^^^^ help: try ignoring the field: `data: _`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `increment_use`
[INFO] [stdout]   --> src/bst/node_data.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub fn increment_use(&mut self) {
[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: `increment_use`
[INFO] [stdout]   --> src/bst/node_data.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub fn increment_use(&mut self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.48s
[INFO] running `Command { std: "docker" "inspect" "5719efeea08be288fa6b24bd1d22ff5e0aac89ec9fc5f873f6c79ff1e376028b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5719efeea08be288fa6b24bd1d22ff5e0aac89ec9fc5f873f6c79ff1e376028b", kill_on_drop: false }`
[INFO] [stdout] 5719efeea08be288fa6b24bd1d22ff5e0aac89ec9fc5f873f6c79ff1e376028b