[INFO] fetching crate mizumochi 0.1.0...
[INFO] testing mizumochi-0.1.0 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate mizumochi 0.1.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate mizumochi 0.1.0 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mizumochi 0.1.0
[INFO] finished tweaking crates.io crate mizumochi 0.1.0
[INFO] tweaked toml for crates.io crate mizumochi 0.1.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded fuse v0.3.1
[INFO] [stderr]   Downloaded factory v0.1.2
[INFO] [stderr]   Downloaded httpcodec v0.2.3
[INFO] [stderr]   Downloaded nbchan v0.1.3
[INFO] [stderr]   Downloaded fibers_http_server v0.1.12
[INFO] [stderr]   Downloaded fibers v0.1.13
[INFO] [stderr]   Downloaded atomic_immut v0.1.4
[INFO] [stderr]   Downloaded prometrics v0.1.13
[INFO] [stderr]   Downloaded bytecodec v0.4.15
[INFO] [stderr]   Downloaded splay_tree v0.2.10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 46e3e375eeb297b5a8c627603ddfe37c64b4614960799554ea32624b6438bd05
[INFO] running `Command { std: "docker" "start" "-a" "46e3e375eeb297b5a8c627603ddfe37c64b4614960799554ea32624b6438bd05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "46e3e375eeb297b5a8c627603ddfe37c64b4614960799554ea32624b6438bd05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46e3e375eeb297b5a8c627603ddfe37c64b4614960799554ea32624b6438bd05", kill_on_drop: false }`
[INFO] [stdout] 46e3e375eeb297b5a8c627603ddfe37c64b4614960799554ea32624b6438bd05
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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=warn" "-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" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6087ce4bce0c9aefe0c5c29c6ef1192dd943a53aa83c677c34fcdf9f6c6d8388
[INFO] running `Command { std: "docker" "start" "-a" "6087ce4bce0c9aefe0c5c29c6ef1192dd943a53aa83c677c34fcdf9f6c6d8388", kill_on_drop: false }`
[INFO] [stderr]    Compiling nom v2.2.1
[INFO] [stderr]    Compiling nbchan v0.1.3
[INFO] [stderr]    Compiling splay_tree v0.2.10
[INFO] [stderr]    Compiling atomic_immut v0.1.4
[INFO] [stderr]    Compiling factory v0.1.2
[INFO] [stderr]    Compiling thread-scoped v1.0.2
[INFO] [stderr]    Compiling fuse v0.3.1
[INFO] [stderr]    Compiling procinfo v0.4.2
[INFO] [stderr]    Compiling mio v0.6.23
[INFO] [stderr]    Compiling trackable_derive v1.0.0
[INFO] [stderr]    Compiling fibers v0.1.13
[INFO] [stderr]    Compiling trackable v1.2.0
[INFO] [stderr]    Compiling trackable v0.2.24
[INFO] [stderr]    Compiling bytecodec v0.4.15
[INFO] [stderr]    Compiling httpcodec v0.2.3
[INFO] [stderr]    Compiling prometrics v0.1.13
[INFO] [stderr]    Compiling fibers_http_server v0.1.12
[INFO] [stderr]    Compiling mizumochi v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/http.rs:21:21
[INFO] [stdout]    |
[INFO] [stdout] 21 | ) -> Result<(), Box<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/main.rs:36:29
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn main() -> Result<(), Box<std::error::Error>> {
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:157:53
[INFO] [stdout]     |
[INFO] [stdout] 157 | fn parse_time(mut input: String) -> Result<u64, Box<std::error::Error>> {
[INFO] [stdout]     |                                                     ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[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: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/config/speed.rs:32:58
[INFO] [stdout]    |
[INFO] [stdout] 32 |             let speed = s.parse::<usize>().map_err(|e| e.description().to_string())?;
[INFO] [stdout]    |                                                          ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/config/speed.rs:37:58
[INFO] [stdout]    |
[INFO] [stdout] 37 |             let speed = s.parse::<usize>().map_err(|e| e.description().to_string())?;
[INFO] [stdout]    |                                                          ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]    --> src/mizumochi.rs:375:57
[INFO] [stdout]     |
[INFO] [stdout] 375 |             error!(self.logger, "init error: {}", error.description());
[INFO] [stdout]     |                                                         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]    --> src/mizumochi.rs:389:67
[INFO] [stdout]     |
[INFO] [stdout] 389 |                     error!(self.logger, "lookup error: {}", error.description());
[INFO] [stdout]     |                                                                   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]    --> src/mizumochi.rs:446:68
[INFO] [stdout]     |
[INFO] [stdout] 446 |                     error!(self.logger, "readdir error: {}", error.description());
[INFO] [stdout]     |                                                                    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]    --> src/mizumochi.rs:876:61
[INFO] [stdout]     |
[INFO] [stdout] 876 |                 error!(self.logger, "init error: {}", error.description());
[INFO] [stdout]     |                                                             ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 22.98s
[INFO] running `Command { std: "docker" "inspect" "6087ce4bce0c9aefe0c5c29c6ef1192dd943a53aa83c677c34fcdf9f6c6d8388", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6087ce4bce0c9aefe0c5c29c6ef1192dd943a53aa83c677c34fcdf9f6c6d8388", kill_on_drop: false }`
[INFO] [stdout] 6087ce4bce0c9aefe0c5c29c6ef1192dd943a53aa83c677c34fcdf9f6c6d8388
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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=warn" "-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" "+beta-2021-08-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6619369fac2c50161da97fdfe423fea0c1dcd8da55e8c712de9caaf22489e99e
[INFO] running `Command { std: "docker" "start" "-a" "6619369fac2c50161da97fdfe423fea0c1dcd8da55e8c712de9caaf22489e99e", kill_on_drop: false }`
[INFO] [stderr]    Compiling mizumochi v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/http.rs:21:21
[INFO] [stdout]    |
[INFO] [stdout] 21 | ) -> Result<(), Box<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/main.rs:36:29
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn main() -> Result<(), Box<std::error::Error>> {
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:157:53
[INFO] [stdout]     |
[INFO] [stdout] 157 | fn parse_time(mut input: String) -> Result<u64, Box<std::error::Error>> {
[INFO] [stdout]     |                                                     ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[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: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/config/speed.rs:32:58
[INFO] [stdout]    |
[INFO] [stdout] 32 |             let speed = s.parse::<usize>().map_err(|e| e.description().to_string())?;
[INFO] [stdout]    |                                                          ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/config/speed.rs:37:58
[INFO] [stdout]    |
[INFO] [stdout] 37 |             let speed = s.parse::<usize>().map_err(|e| e.description().to_string())?;
[INFO] [stdout]    |                                                          ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]    --> src/mizumochi.rs:375:57
[INFO] [stdout]     |
[INFO] [stdout] 375 |             error!(self.logger, "init error: {}", error.description());
[INFO] [stdout]     |                                                         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]    --> src/mizumochi.rs:389:67
[INFO] [stdout]     |
[INFO] [stdout] 389 |                     error!(self.logger, "lookup error: {}", error.description());
[INFO] [stdout]     |                                                                   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]    --> src/mizumochi.rs:446:68
[INFO] [stdout]     |
[INFO] [stdout] 446 |                     error!(self.logger, "readdir error: {}", error.description());
[INFO] [stdout]     |                                                                    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]    --> src/mizumochi.rs:876:61
[INFO] [stdout]     |
[INFO] [stdout] 876 |                 error!(self.logger, "init error: {}", error.description());
[INFO] [stdout]     |                                                             ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.55s
[INFO] running `Command { std: "docker" "inspect" "6619369fac2c50161da97fdfe423fea0c1dcd8da55e8c712de9caaf22489e99e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6619369fac2c50161da97fdfe423fea0c1dcd8da55e8c712de9caaf22489e99e", kill_on_drop: false }`
[INFO] [stdout] 6619369fac2c50161da97fdfe423fea0c1dcd8da55e8c712de9caaf22489e99e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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=warn" "-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" "+beta-2021-08-01" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 9962071605e19eb0b9db31792f8ebcbf4b04218c026e72c8bc3fe2a59aecf866
[INFO] running `Command { std: "docker" "start" "-a" "9962071605e19eb0b9db31792f8ebcbf4b04218c026e72c8bc3fe2a59aecf866", kill_on_drop: false }`
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/http.rs:21:21
[INFO] [stderr]    |
[INFO] [stderr] 21 | ) -> Result<(), Box<std::error::Error>> {
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:36:29
[INFO] [stderr]    |
[INFO] [stderr] 36 | fn main() -> Result<(), Box<std::error::Error>> {
[INFO] [stderr]    |                             ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/main.rs:157:53
[INFO] [stderr]     |
[INFO] [stderr] 157 | fn parse_time(mut input: String) -> Result<u64, Box<std::error::Error>> {
[INFO] [stderr]     |                                                     ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn std::error::Error`
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stderr]   --> src/config/speed.rs:32:58
[INFO] [stderr]    |
[INFO] [stderr] 32 |             let speed = s.parse::<usize>().map_err(|e| e.description().to_string())?;
[INFO] [stderr]    |                                                          ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stderr]   --> src/config/speed.rs:37:58
[INFO] [stderr]    |
[INFO] [stderr] 37 |             let speed = s.parse::<usize>().map_err(|e| e.description().to_string())?;
[INFO] [stderr]    |                                                          ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stderr]    --> src/mizumochi.rs:375:57
[INFO] [stderr]     |
[INFO] [stderr] 375 |             error!(self.logger, "init error: {}", error.description());
[INFO] [stderr]     |                                                         ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stderr]    --> src/mizumochi.rs:389:67
[INFO] [stderr]     |
[INFO] [stderr] 389 |                     error!(self.logger, "lookup error: {}", error.description());
[INFO] [stderr]     |                                                                   ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stderr]    --> src/mizumochi.rs:446:68
[INFO] [stderr]     |
[INFO] [stderr] 446 |                     error!(self.logger, "readdir error: {}", error.description());
[INFO] [stderr]     |                                                                    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stderr]    --> src/mizumochi.rs:876:61
[INFO] [stderr]     |
[INFO] [stderr] 876 |                 error!(self.logger, "init error: {}", error.description());
[INFO] [stderr]     |                                                             ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `mizumochi` (bin "mizumochi" test) generated 9 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/mizumochi-46fce352e21424b7)
[INFO] [stdout] 
[INFO] [stdout] running 8 tests
[INFO] [stdout] test state::tests::test_toggle_mode_keep_stable ... ok
[INFO] [stdout] test state::tests::test_state_manager ... ok
[INFO] [stdout] test state::tests::test_toggle_mode_stable_to_unstable ... ok
[INFO] [stdout] test state::tests::test_toggle_mode_unstable_to_stable ... ok
[INFO] [stdout] test mizumochi::tests::test_compute_sleep_duration_to_adjust_speed ... ok
[INFO] [stdout] test state::tests::test_toggle_mode ... ok
[INFO] [stdout] test config::speed::tests::test_speed_new ... ok
[INFO] [stdout] test state::tests::test_toggle_mode_keep_unstable ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 8 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "9962071605e19eb0b9db31792f8ebcbf4b04218c026e72c8bc3fe2a59aecf866", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9962071605e19eb0b9db31792f8ebcbf4b04218c026e72c8bc3fe2a59aecf866", kill_on_drop: false }`
[INFO] [stdout] 9962071605e19eb0b9db31792f8ebcbf4b04218c026e72c8bc3fe2a59aecf866
