[INFO] fetching crate root-io 0.2.1...
[INFO] checking root-io-0.2.1 against try#d990716b6a1fdde1300748828a9c9e79dfd0b898 for pr-74846
[INFO] extracting crate root-io 0.2.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate root-io 0.2.1 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 root-io 0.2.1
[INFO] finished tweaking crates.io crate root-io 0.2.1
[INFO] tweaked toml for crates.io crate root-io 0.2.1 written to /workspace/builds/worker-4/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded lzma-rs v0.1.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] [stdout] 52f7c2a904f51abdca7f2efdb182d61cc634e7a0dada76d891513b775ed50550
[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" "52f7c2a904f51abdca7f2efdb182d61cc634e7a0dada76d891513b775ed50550", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "52f7c2a904f51abdca7f2efdb182d61cc634e7a0dada76d891513b775ed50550", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52f7c2a904f51abdca7f2efdb182d61cc634e7a0dada76d891513b775ed50550", kill_on_drop: false }`
[INFO] [stdout] 52f7c2a904f51abdca7f2efdb182d61cc634e7a0dada76d891513b775ed50550
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] [stdout] e69b48f4abeac8cf0af3bcd51c41cebdc9e8701e637ffcef8dd483c02a9419e4
[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" "e69b48f4abeac8cf0af3bcd51c41cebdc9e8701e637ffcef8dd483c02a9419e4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
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[INFO] [stderr]     Checking root-io v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]   --> src/core/tkey.rs:78:23
[INFO] [stdout]    |
[INFO] [stdout] 78 |                       (decompress(obj).unwrap().1)
[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 block return value
[INFO] [stdout]   --> src/tree_reader/container.rs:53:23
[INFO] [stdout]    |
[INFO] [stdout] 53 |                       (decompress(buf).unwrap().1)
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]   --> src/core/tkey.rs:78:23
[INFO] [stdout]    |
[INFO] [stdout] 78 |                       (decompress(obj).unwrap().1)
[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 block return value
[INFO] [stdout]   --> src/tree_reader/container.rs:53:23
[INFO] [stdout]    |
[INFO] [stdout] 53 |                       (decompress(buf).unwrap().1)
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0596]: cannot borrow `rt` as mutable, as it is not declared as mutable
[INFO] [stdout]   --> benches/iter_branch.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let rt = Runtime::new().unwrap();
[INFO] [stdout]    |         -- help: consider changing this to be mutable: `mut rt`
[INFO] [stdout] 26 |     rt.block_on(fut);
[INFO] [stdout]    |     ^^ cannot borrow as mutable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0596]: cannot borrow `rt` as mutable, as it is not declared as mutable
[INFO] [stdout]   --> benches/iter_branch.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let rt = Runtime::new().unwrap();
[INFO] [stdout]    |         -- help: consider changing this to be mutable: `mut rt`
[INFO] [stdout] 45 |     rt.block_on(fut);
[INFO] [stdout]    |     ^^ cannot borrow as mutable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0596`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `root-io`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "e69b48f4abeac8cf0af3bcd51c41cebdc9e8701e637ffcef8dd483c02a9419e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e69b48f4abeac8cf0af3bcd51c41cebdc9e8701e637ffcef8dd483c02a9419e4", kill_on_drop: false }`
[INFO] [stdout] e69b48f4abeac8cf0af3bcd51c41cebdc9e8701e637ffcef8dd483c02a9419e4