[INFO] fetching crate prometrics 0.1.13...
[INFO] checking prometrics-0.1.13 against master#936f2600b6c903b04387f74ed5cbce88bb06d243 for pr-91141
[INFO] extracting crate prometrics 0.1.13 into /workspace/builds/worker-29/source
[INFO] validating manifest of crates.io crate prometrics 0.1.13 on toolchain 936f2600b6c903b04387f74ed5cbce88bb06d243
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate prometrics 0.1.13
[INFO] finished tweaking crates.io crate prometrics 0.1.13
[INFO] tweaked toml for crates.io crate prometrics 0.1.13 written to /workspace/builds/worker-29/source/Cargo.toml
[INFO] crate crates.io crate prometrics 0.1.13 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "fetch" "--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-29/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ea545795934e8a4e0e1bed1976f5a67cfa7f2d3dc7f25657dd4101e314436dc8
[INFO] running `Command { std: "docker" "start" "-a" "ea545795934e8a4e0e1bed1976f5a67cfa7f2d3dc7f25657dd4101e314436dc8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ea545795934e8a4e0e1bed1976f5a67cfa7f2d3dc7f25657dd4101e314436dc8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea545795934e8a4e0e1bed1976f5a67cfa7f2d3dc7f25657dd4101e314436dc8", kill_on_drop: false }`
[INFO] [stdout] ea545795934e8a4e0e1bed1976f5a67cfa7f2d3dc7f25657dd4101e314436dc8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 114b62c31e42706b698a706e9e2a8e6e6dc2f66666f574c8bacf9945a86fc9d4
[INFO] running `Command { std: "docker" "start" "-a" "114b62c31e42706b698a706e9e2a8e6e6dc2f66666f574c8bacf9945a86fc9d4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.10
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]     Checking procinfo v0.4.2
[INFO] [stderr]    Compiling trackable_derive v0.1.3
[INFO] [stderr]     Checking trackable v0.2.23
[INFO] [stderr]     Checking prometrics v0.1.13 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/metrics/process.rs:17:31
[INFO] [stdout]    |
[INFO] [stdout] 17 |     static ref CLK_TCK: f64 = { unsafe { libc::sysconf(libc::_SC_CLK_TCK) as f64 } };
[INFO] [stdout]    |                               ^^                                                  ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 17 -     static ref CLK_TCK: f64 = { unsafe { libc::sysconf(libc::_SC_CLK_TCK) as f64 } };
[INFO] [stdout] 17 +     static ref CLK_TCK: f64 = unsafe { libc::sysconf(libc::_SC_CLK_TCK) as f64 };
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/metrics/process.rs:18:34
[INFO] [stdout]    |
[INFO] [stdout] 18 |     static ref PAGESIZE: usize = { unsafe { libc::sysconf(libc::_SC_PAGESIZE) as usize } };
[INFO] [stdout]    |                                  ^^                                                     ^^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 18 -     static ref PAGESIZE: usize = { unsafe { libc::sysconf(libc::_SC_PAGESIZE) as usize } };
[INFO] [stdout] 18 +     static ref PAGESIZE: usize = unsafe { libc::sysconf(libc::_SC_PAGESIZE) as usize };
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/metrics/process.rs:17:31
[INFO] [stdout]    |
[INFO] [stdout] 17 |     static ref CLK_TCK: f64 = { unsafe { libc::sysconf(libc::_SC_CLK_TCK) as f64 } };
[INFO] [stdout]    |                               ^^                                                  ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 17 -     static ref CLK_TCK: f64 = { unsafe { libc::sysconf(libc::_SC_CLK_TCK) as f64 } };
[INFO] [stdout] 17 +     static ref CLK_TCK: f64 = unsafe { libc::sysconf(libc::_SC_CLK_TCK) as f64 };
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/metrics/process.rs:18:34
[INFO] [stdout]    |
[INFO] [stdout] 18 |     static ref PAGESIZE: usize = { unsafe { libc::sysconf(libc::_SC_PAGESIZE) as usize } };
[INFO] [stdout]    |                                  ^^                                                     ^^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 18 -     static ref PAGESIZE: usize = { unsafe { libc::sysconf(libc::_SC_PAGESIZE) as usize } };
[INFO] [stdout] 18 +     static ref PAGESIZE: usize = unsafe { libc::sysconf(libc::_SC_PAGESIZE) as usize };
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `labels`
[INFO] [stdout]    --> src/label.rs:210:5
[INFO] [stdout]     |
[INFO] [stdout] 210 |     labels: std::sync::Arc<Vec<Label>>,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `count`
[INFO] [stdout]    --> src/metrics/histogram.rs:321:5
[INFO] [stdout]     |
[INFO] [stdout] 321 |     count: AtomicU64,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `labels`
[INFO] [stdout]    --> src/label.rs:210:5
[INFO] [stdout]     |
[INFO] [stdout] 210 |     labels: std::sync::Arc<Vec<Label>>,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `count`
[INFO] [stdout]    --> src/metrics/histogram.rs:321:5
[INFO] [stdout]     |
[INFO] [stdout] 321 |     count: AtomicU64,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.67s
[INFO] running `Command { std: "docker" "inspect" "114b62c31e42706b698a706e9e2a8e6e6dc2f66666f574c8bacf9945a86fc9d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "114b62c31e42706b698a706e9e2a8e6e6dc2f66666f574c8bacf9945a86fc9d4", kill_on_drop: false }`
[INFO] [stdout] 114b62c31e42706b698a706e9e2a8e6e6dc2f66666f574c8bacf9945a86fc9d4