[INFO] fetching crate assertx 0.1.2...
[INFO] checking assertx-0.1.2 against try#d990716b6a1fdde1300748828a9c9e79dfd0b898 for pr-74846
[INFO] extracting crate assertx 0.1.2 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate assertx 0.1.2 on toolchain d990716b6a1fdde1300748828a9c9e79dfd0b898
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate assertx 0.1.2
[INFO] finished tweaking crates.io crate assertx 0.1.2
[INFO] tweaked toml for crates.io crate assertx 0.1.2 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "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] 821686fe0ce2f251e68266219bfde1c8dc445b98e80a9e2839109311b27d9277
[INFO] running `Command { std: "docker" "start" "-a" "821686fe0ce2f251e68266219bfde1c8dc445b98e80a9e2839109311b27d9277", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "821686fe0ce2f251e68266219bfde1c8dc445b98e80a9e2839109311b27d9277", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "821686fe0ce2f251e68266219bfde1c8dc445b98e80a9e2839109311b27d9277", kill_on_drop: false }`
[INFO] [stdout] 821686fe0ce2f251e68266219bfde1c8dc445b98e80a9e2839109311b27d9277
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "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] aa22f5ef7ef37d7324405b6d50a71deecc106f34266365bfb6dd0f2b78e24e1a
[INFO] running `Command { std: "docker" "start" "-a" "aa22f5ef7ef37d7324405b6d50a71deecc106f34266365bfb6dd0f2b78e24e1a", kill_on_drop: false }`
[INFO] [stderr]     Checking assertx v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/collections.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut actual_iterator = &mut actual.clone().into_iter();
[INFO] [stdout]   |         ----^^^^^^^^^^^^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/collections.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut expected_iterator = &mut expected.clone().into_iter();
[INFO] [stdout]   |         ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/collections.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut actual_iterator = &mut actual.clone().into_iter();
[INFO] [stdout]   |         ----^^^^^^^^^^^^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/collections.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut expected_iterator = &mut expected.clone().into_iter();
[INFO] [stdout]   |         ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `Command { std: "docker" "inspect" "aa22f5ef7ef37d7324405b6d50a71deecc106f34266365bfb6dd0f2b78e24e1a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa22f5ef7ef37d7324405b6d50a71deecc106f34266365bfb6dd0f2b78e24e1a", kill_on_drop: false }`
[INFO] [stdout] aa22f5ef7ef37d7324405b6d50a71deecc106f34266365bfb6dd0f2b78e24e1a