[INFO] fetching crate reservoir-sampling 0.4.1...
[INFO] checking reservoir-sampling-0.4.1 against master#4fa76a4a7742bb9c1febe33019f5a9e7e4839a65 for pr-83744
[INFO] extracting crate reservoir-sampling 0.4.1 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate reservoir-sampling 0.4.1 on toolchain 4fa76a4a7742bb9c1febe33019f5a9e7e4839a65
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate reservoir-sampling 0.4.1
[INFO] finished tweaking crates.io crate reservoir-sampling 0.4.1
[INFO] tweaked toml for crates.io crate reservoir-sampling 0.4.1 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate crates.io crate reservoir-sampling 0.4.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "metadata" "--no-deps" "--format-version=1", 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] 2ac753322c97d1632974f7bf68ce9efa88668aad8ee4b2f0a086166dc85f7643
[INFO] running `Command { std: "docker" "start" "-a" "2ac753322c97d1632974f7bf68ce9efa88668aad8ee4b2f0a086166dc85f7643", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2ac753322c97d1632974f7bf68ce9efa88668aad8ee4b2f0a086166dc85f7643", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ac753322c97d1632974f7bf68ce9efa88668aad8ee4b2f0a086166dc85f7643", kill_on_drop: false }`
[INFO] [stdout] 2ac753322c97d1632974f7bf68ce9efa88668aad8ee4b2f0a086166dc85f7643
[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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "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] a02e7d7baac3696abcb117d772915efdd78f535b05ec58cf80393880c4f3cdcb
[INFO] running `Command { std: "docker" "start" "-a" "a02e7d7baac3696abcb117d772915efdd78f535b05ec58cf80393880c4f3cdcb", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]     Checking getrandom v0.2.0
[INFO] [stderr]     Checking rand_core v0.6.0
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking rand v0.8.3
[INFO] [stderr]     Checking reservoir-sampling v0.4.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `mean`
[INFO] [stdout]  --> tests/common/mod.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn mean(arr: &[usize]) -> usize {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]   --> tests/common/mod.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn run (max_tests: usize, f: fn(Range<usize>, &mut [usize]) ) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.79s
[INFO] running `Command { std: "docker" "inspect" "a02e7d7baac3696abcb117d772915efdd78f535b05ec58cf80393880c4f3cdcb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a02e7d7baac3696abcb117d772915efdd78f535b05ec58cf80393880c4f3cdcb", kill_on_drop: false }`
[INFO] [stdout] a02e7d7baac3696abcb117d772915efdd78f535b05ec58cf80393880c4f3cdcb