[INFO] fetching crate exonum_leveldb 0.9.1...
[INFO] checking exonum_leveldb-0.9.1 against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] extracting crate exonum_leveldb 0.9.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate exonum_leveldb 0.9.1 on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate exonum_leveldb 0.9.1
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate exonum_leveldb 0.9.1
[INFO] tweaked toml for crates.io crate exonum_leveldb 0.9.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: An explicit [[test]] section is specified in Cargo.toml which currently
[INFO] [stderr] disables Cargo from automatically inferring other test targets.
[INFO] [stderr] This inference behavior will change in the Rust 2018 edition and the following
[INFO] [stderr] files will be included as a test target:
[INFO] [stderr] 
[INFO] [stderr] * /workspace/builds/worker-6/source/tests/cache.rs
[INFO] [stderr] * /workspace/builds/worker-6/source/tests/comparator.rs
[INFO] [stderr] * /workspace/builds/worker-6/source/tests/snapshots.rs
[INFO] [stderr] * /workspace/builds/worker-6/source/tests/writebatch.rs
[INFO] [stderr] * /workspace/builds/worker-6/source/tests/concurrent_access.rs
[INFO] [stderr] * /workspace/builds/worker-6/source/tests/iterator.rs
[INFO] [stderr] * /workspace/builds/worker-6/source/tests/utils.rs
[INFO] [stderr] * /workspace/builds/worker-6/source/tests/binary.rs
[INFO] [stderr] * /workspace/builds/worker-6/source/tests/compaction.rs
[INFO] [stderr] * /workspace/builds/worker-6/source/tests/management.rs
[INFO] [stderr] * /workspace/builds/worker-6/source/tests/database.rs
[INFO] [stderr] 
[INFO] [stderr] This is likely to break cargo build or cargo test as these files may not be
[INFO] [stderr] ready to be compiled as a test target today. You can future-proof yourself
[INFO] [stderr] and disable this warning by adding `autotests = false` to your [package]
[INFO] [stderr] section. You may also move the files to a location where Cargo would not
[INFO] [stderr] automatically infer them to be a target, such as in subfolders.
[INFO] [stderr] 
[INFO] [stderr] For more information on this warning you can consult
[INFO] [stderr] https://github.com/rust-lang/cargo/issues/5330
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded leveldb-sys v2.0.8
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 24c9bcaab0126b63be9573b314b8cf043488ed674109eb1ca6e8783c38463be5
[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" "24c9bcaab0126b63be9573b314b8cf043488ed674109eb1ca6e8783c38463be5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "24c9bcaab0126b63be9573b314b8cf043488ed674109eb1ca6e8783c38463be5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "24c9bcaab0126b63be9573b314b8cf043488ed674109eb1ca6e8783c38463be5", kill_on_drop: false }`
[INFO] [stdout] 24c9bcaab0126b63be9573b314b8cf043488ed674109eb1ca6e8783c38463be5
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 925eaa41f18e1e5d03421cc1b98f5a11f21d7969a02b7a99a839550cda116000
[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" "925eaa41f18e1e5d03421cc1b98f5a11f21d7969a02b7a99a839550cda116000", kill_on_drop: false }`
[INFO] [stderr] warning: An explicit [[test]] section is specified in Cargo.toml which currently
[INFO] [stderr] disables Cargo from automatically inferring other test targets.
[INFO] [stderr] This inference behavior will change in the Rust 2018 edition and the following
[INFO] [stderr] files will be included as a test target:
[INFO] [stderr] 
[INFO] [stderr] * /opt/rustwide/workdir/tests/cache.rs
[INFO] [stderr] * /opt/rustwide/workdir/tests/comparator.rs
[INFO] [stderr] * /opt/rustwide/workdir/tests/snapshots.rs
[INFO] [stderr] * /opt/rustwide/workdir/tests/writebatch.rs
[INFO] [stderr] * /opt/rustwide/workdir/tests/concurrent_access.rs
[INFO] [stderr] * /opt/rustwide/workdir/tests/iterator.rs
[INFO] [stderr] * /opt/rustwide/workdir/tests/utils.rs
[INFO] [stderr] * /opt/rustwide/workdir/tests/binary.rs
[INFO] [stderr] * /opt/rustwide/workdir/tests/compaction.rs
[INFO] [stderr] * /opt/rustwide/workdir/tests/management.rs
[INFO] [stderr] * /opt/rustwide/workdir/tests/database.rs
[INFO] [stderr] 
[INFO] [stderr] This is likely to break cargo build or cargo test as these files may not be
[INFO] [stderr] ready to be compiled as a test target today. You can future-proof yourself
[INFO] [stderr] and disable this warning by adding `autotests = false` to your [package]
[INFO] [stderr] section. You may also move the files to a location where Cargo would not
[INFO] [stderr] automatically infer them to be a target, such as in subfolders.
[INFO] [stderr] 
[INFO] [stderr] For more information on this warning you can consult
[INFO] [stderr] https://github.com/rust-lang/cargo/issues/5330
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling cc v1.0.69
[INFO] [stderr]    Compiling cmake v0.1.45
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]    Compiling leveldb-sys v2.0.8
[INFO] [stderr]     Checking tempdir v0.3.7
[INFO] [stderr]     Checking exonum_leveldb v0.9.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/database/error.rs:41:32
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn cause(&self) -> Option<&std::error::Error> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/database/error.rs:41:32
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn cause(&self) -> Option<&std::error::Error> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> tests/iterator.rs:65:22
[INFO] [stdout]    |
[INFO] [stdout] 65 |   let iterable: &mut Iterable = database;
[INFO] [stdout]    |                      ^^^^^^^^ help: use `dyn`: `dyn Iterable`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> tests/iterator.rs:80:22
[INFO] [stdout]    |
[INFO] [stdout] 80 |   let iterable: &mut Iterable = database;
[INFO] [stdout]    |                      ^^^^^^^^ help: use `dyn`: `dyn Iterable`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `collect` that must be used
[INFO] [stdout]   --> tests/concurrent_access.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | /     (0..10).map(|i| {
[INFO] [stdout] 18 | |          let local_db = shared.clone();
[INFO] [stdout] 19 | |
[INFO] [stdout] 20 | |          thread::spawn(move || {
[INFO] [stdout] ...  |
[INFO] [stdout] 28 | |     .map(JoinHandle::join)
[INFO] [stdout] 29 | |     .collect::<Vec<_>>();
[INFO] [stdout]    | |_________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 20.15s
[INFO] running `Command { std: "docker" "inspect" "925eaa41f18e1e5d03421cc1b98f5a11f21d7969a02b7a99a839550cda116000", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "925eaa41f18e1e5d03421cc1b98f5a11f21d7969a02b7a99a839550cda116000", kill_on_drop: false }`
[INFO] [stdout] 925eaa41f18e1e5d03421cc1b98f5a11f21d7969a02b7a99a839550cda116000