[INFO] fetching crate openmetrics 0.2.1...
[INFO] checking openmetrics-0.2.1 against master#c919f490bbcd2b29b74016101f7ec71aaa24bdbb for pr-79073
[INFO] extracting crate openmetrics 0.2.1 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate openmetrics 0.2.1 on toolchain c919f490bbcd2b29b74016101f7ec71aaa24bdbb
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c919f490bbcd2b29b74016101f7ec71aaa24bdbb" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate openmetrics 0.2.1
[INFO] finished tweaking crates.io crate openmetrics 0.2.1
[INFO] tweaked toml for crates.io crate openmetrics 0.2.1 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c919f490bbcd2b29b74016101f7ec71aaa24bdbb" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c919f490bbcd2b29b74016101f7ec71aaa24bdbb" "fetch" "--locked" "--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-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+c919f490bbcd2b29b74016101f7ec71aaa24bdbb" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eb8d94c227e72d73a9e956a96941caec87a640c3dbc1f8200a0ff705124bfecf
[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" "eb8d94c227e72d73a9e956a96941caec87a640c3dbc1f8200a0ff705124bfecf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb8d94c227e72d73a9e956a96941caec87a640c3dbc1f8200a0ff705124bfecf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb8d94c227e72d73a9e956a96941caec87a640c3dbc1f8200a0ff705124bfecf", kill_on_drop: false }`
[INFO] [stdout] eb8d94c227e72d73a9e956a96941caec87a640c3dbc1f8200a0ff705124bfecf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+c919f490bbcd2b29b74016101f7ec71aaa24bdbb" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8b6e6dcff772cfe92de9ce1f4a476c76764328a24d07ff18af48da9f6dd94ef5
[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" "8b6e6dcff772cfe92de9ce1f4a476c76764328a24d07ff18af48da9f6dd94ef5", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling syn v1.0.50
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]     Checking openmetrics v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `metric_name`
[INFO] [stdout]   --> src/metrics.rs:80:12
[INFO] [stdout]    |
[INFO] [stdout] 80 | pub fn add(metric_name: &str, metric_text: &str) -> Label {
[INFO] [stdout]    |            ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_metric_name`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `metric_name`
[INFO] [stdout]   --> src/metrics.rs:24:16
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub fn add(metric_name: &str, metric_text: &str) -> Label {
[INFO] [stdout]    |                ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_metric_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `metric_name`
[INFO] [stdout]   --> src/metrics.rs:61:28
[INFO] [stdout]    |
[INFO] [stdout] 61 |     pub fn new_with_metric(metric_name: &str, metric_text: &str) -> Self {
[INFO] [stdout]    |                            ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_metric_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `metric_text`
[INFO] [stdout]   --> src/metrics.rs:61:47
[INFO] [stdout]    |
[INFO] [stdout] 61 |     pub fn new_with_metric(metric_name: &str, metric_text: &str) -> Self {
[INFO] [stdout]    |                                               ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_metric_text`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `metric_name`
[INFO] [stdout]   --> src/metrics.rs:80:12
[INFO] [stdout]    |
[INFO] [stdout] 80 | pub fn add(metric_name: &str, metric_text: &str) -> Label {
[INFO] [stdout]    |            ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_metric_name`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `metric_name`
[INFO] [stdout]   --> src/metrics.rs:24:16
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub fn add(metric_name: &str, metric_text: &str) -> Label {
[INFO] [stdout]    |                ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_metric_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `metric_name`
[INFO] [stdout]   --> src/metrics.rs:61:28
[INFO] [stdout]    |
[INFO] [stdout] 61 |     pub fn new_with_metric(metric_name: &str, metric_text: &str) -> Self {
[INFO] [stdout]    |                            ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_metric_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `metric_text`
[INFO] [stdout]   --> src/metrics.rs:61:47
[INFO] [stdout]    |
[INFO] [stdout] 61 |     pub fn new_with_metric(metric_name: &str, metric_text: &str) -> Self {
[INFO] [stdout]    |                                               ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_metric_text`
[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 19.83s
[INFO] running `Command { std: "docker" "inspect" "8b6e6dcff772cfe92de9ce1f4a476c76764328a24d07ff18af48da9f6dd94ef5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b6e6dcff772cfe92de9ce1f4a476c76764328a24d07ff18af48da9f6dd94ef5", kill_on_drop: false }`
[INFO] [stdout] 8b6e6dcff772cfe92de9ce1f4a476c76764328a24d07ff18af48da9f6dd94ef5