[INFO] fetching crate ixlist 0.1.0...
[INFO] checking ixlist-0.1.0 against try#353a0a223066e9f46a1d935f2271a26c3c5002bb for pr-75180
[INFO] extracting crate ixlist 0.1.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate ixlist 0.1.0 on toolchain 353a0a223066e9f46a1d935f2271a26c3c5002bb
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ixlist 0.1.0
[INFO] finished tweaking crates.io crate ixlist 0.1.0
[INFO] tweaked toml for crates.io crate ixlist 0.1.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5144d892131ff3d378846f31c732e564e526580baa3c5397fa65249f21446c5d
[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" "5144d892131ff3d378846f31c732e564e526580baa3c5397fa65249f21446c5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5144d892131ff3d378846f31c732e564e526580baa3c5397fa65249f21446c5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5144d892131ff3d378846f31c732e564e526580baa3c5397fa65249f21446c5d", kill_on_drop: false }`
[INFO] [stdout] 5144d892131ff3d378846f31c732e564e526580baa3c5397fa65249f21446c5d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "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] 50a10da00a5f0acaaf1bd2cebc404b97b0336062cd43793850ee2b1de5afde33
[INFO] running `Command { std: "docker" "start" "-a" "50a10da00a5f0acaaf1bd2cebc404b97b0336062cd43793850ee2b1de5afde33", kill_on_drop: false }`
[INFO] [stderr]     Checking bencher v0.1.5
[INFO] [stderr]     Checking ixlist v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking itertools v0.6.5
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> benches/bench1.rs:26:18
[INFO] [stdout]    |
[INFO] [stdout] 26 |         for _ in (0..n) {
[INFO] [stdout]    |                  ^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> benches/bench1.rs:38:18
[INFO] [stdout]    |
[INFO] [stdout] 38 |         for _ in (0..n) {
[INFO] [stdout]    |                  ^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> benches/bench1.rs:66:18
[INFO] [stdout]    |
[INFO] [stdout] 66 |         for _ in (0..n) {
[INFO] [stdout]    |                  ^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> benches/bench1.rs:78:18
[INFO] [stdout]    |
[INFO] [stdout] 78 |         for _ in (0..n) {
[INFO] [stdout]    |                  ^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> benches/bench1.rs:90:14
[INFO] [stdout]    |
[INFO] [stdout] 90 |     for _ in (0..n) {
[INFO] [stdout]    |              ^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> benches/bench1.rs:110:14
[INFO] [stdout]     |
[INFO] [stdout] 110 |     for _ in (0..n) {
[INFO] [stdout]     |              ^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> benches/bench1.rs:131:14
[INFO] [stdout]     |
[INFO] [stdout] 131 |     for _ in (0..n) {
[INFO] [stdout]     |              ^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.61s
[INFO] running `Command { std: "docker" "inspect" "50a10da00a5f0acaaf1bd2cebc404b97b0336062cd43793850ee2b1de5afde33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50a10da00a5f0acaaf1bd2cebc404b97b0336062cd43793850ee2b1de5afde33", kill_on_drop: false }`
[INFO] [stdout] 50a10da00a5f0acaaf1bd2cebc404b97b0336062cd43793850ee2b1de5afde33