[INFO] cloning repository https://github.com/cauebs/clapping-music [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cauebs/clapping-music" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcauebs%2Fclapping-music", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcauebs%2Fclapping-music'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 00f2992f4ee94e04078d913b5d4447be72afd91c [INFO] testing cauebs/clapping-music against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcauebs%2Fclapping-music" "/workspace/builds/worker-17/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-17/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/cauebs/clapping-music on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/cauebs/clapping-music [INFO] finished tweaking git repo https://github.com/cauebs/clapping-music [INFO] tweaked toml for git repo https://github.com/cauebs/clapping-music written to /workspace/builds/worker-17/source/Cargo.toml [INFO] crate git repo https://github.com/cauebs/clapping-music already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] e001c4ba120cb1ce5ca1477d18368eed482321e2abb5e460c56d579410dfbe29 [INFO] running `Command { std: "docker" "start" "-a" "e001c4ba120cb1ce5ca1477d18368eed482321e2abb5e460c56d579410dfbe29", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "e001c4ba120cb1ce5ca1477d18368eed482321e2abb5e460c56d579410dfbe29", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "e001c4ba120cb1ce5ca1477d18368eed482321e2abb5e460c56d579410dfbe29", kill_on_drop: false }` [INFO] [stdout] e001c4ba120cb1ce5ca1477d18368eed482321e2abb5e460c56d579410dfbe29 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] fc59b80468eef8c61fcdbab5ec3a9825451e6c9d8e04c77399492a9fc4ca6519 [INFO] running `Command { std: "docker" "start" "-a" "fc59b80468eef8c61fcdbab5ec3a9825451e6c9d8e04c77399492a9fc4ca6519", kill_on_drop: false }` [INFO] [stderr] Compiling num-traits v0.2.6 [INFO] [stderr] Compiling libc v0.2.43 [INFO] [stderr] Compiling num-integer v0.1.39 [INFO] [stderr] Compiling rustc-serialize v0.3.24 [INFO] [stderr] Compiling pkg-config v0.3.14 [INFO] [stderr] Compiling num-iter v0.1.37 [INFO] [stderr] Compiling void v1.0.2 [INFO] [stderr] Compiling bitflags v0.9.1 [INFO] [stderr] Compiling cfg-if v0.1.6 [INFO] [stderr] Compiling memalloc v0.1.0 [INFO] [stderr] Compiling byteorder v0.4.2 [INFO] [stderr] Compiling bitflags v0.3.3 [INFO] [stderr] Compiling rand v0.4.3 [INFO] [stderr] Compiling nix v0.9.0 [INFO] [stderr] Compiling alsa-sys v0.1.2 [INFO] [stderr] Compiling rand v0.3.22 [INFO] [stderr] Compiling num-traits v0.1.43 [INFO] [stderr] Compiling enum_primitive v0.1.1 [INFO] [stderr] Compiling num-bigint v0.1.44 [INFO] [stderr] Compiling num-complex v0.1.43 [INFO] [stderr] Compiling alsa v0.2.1 [INFO] [stderr] Compiling num-rational v0.1.42 [INFO] [stderr] Compiling num v0.1.42 [INFO] [stderr] Compiling rimd v0.0.1 [INFO] [stderr] Compiling pitch_calc v0.11.1 [INFO] [stderr] Compiling midir v0.5.0 [INFO] [stderr] Compiling clapping-music v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:12:53 [INFO] [stdout] | [INFO] [stdout] 12 | fn from_port(number: usize) -> Result> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:23:25 [INFO] [stdout] | [INFO] [stdout] 23 | ) -> Result<(), Box> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:35:85 [INFO] [stdout] | [INFO] [stdout] 35 | fn press(&mut self, notes: &[(Letter, Octave)], velocity: u8) -> Result<(), Box> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:46:87 [INFO] [stdout] | [INFO] [stdout] 46 | fn release(&mut self, notes: &[(Letter, Octave)], velocity: u8) -> Result<(), Box> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:84:21 [INFO] [stdout] | [INFO] [stdout] 84 | ) -> Result<(), Box> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:121:56 [INFO] [stdout] | [INFO] [stdout] 121 | fn clapping_music(piano: &mut Piano) -> Result<(), Box> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:140:29 [INFO] [stdout] | [INFO] [stdout] 140 | fn main() -> Result<(), Box> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 7 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 5.94s [INFO] running `Command { std: "docker" "inspect" "fc59b80468eef8c61fcdbab5ec3a9825451e6c9d8e04c77399492a9fc4ca6519", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "fc59b80468eef8c61fcdbab5ec3a9825451e6c9d8e04c77399492a9fc4ca6519", kill_on_drop: false }` [INFO] [stdout] fc59b80468eef8c61fcdbab5ec3a9825451e6c9d8e04c77399492a9fc4ca6519 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] b7c4dc975d0c8b22f1c1326f04e1236bd9edae2b83fb5d34f09c0d1aa16560de [INFO] running `Command { std: "docker" "start" "-a" "b7c4dc975d0c8b22f1c1326f04e1236bd9edae2b83fb5d34f09c0d1aa16560de", kill_on_drop: false }` [INFO] [stderr] Compiling clapping-music v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:12:53 [INFO] [stdout] | [INFO] [stdout] 12 | fn from_port(number: usize) -> Result> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:23:25 [INFO] [stdout] | [INFO] [stdout] 23 | ) -> Result<(), Box> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:35:85 [INFO] [stdout] | [INFO] [stdout] 35 | fn press(&mut self, notes: &[(Letter, Octave)], velocity: u8) -> Result<(), Box> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:46:87 [INFO] [stdout] | [INFO] [stdout] 46 | fn release(&mut self, notes: &[(Letter, Octave)], velocity: u8) -> Result<(), Box> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:84:21 [INFO] [stdout] | [INFO] [stdout] 84 | ) -> Result<(), Box> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:121:56 [INFO] [stdout] | [INFO] [stdout] 121 | fn clapping_music(piano: &mut Piano) -> Result<(), Box> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:140:29 [INFO] [stdout] | [INFO] [stdout] 140 | fn main() -> Result<(), Box> { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 7 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.86s [INFO] running `Command { std: "docker" "inspect" "b7c4dc975d0c8b22f1c1326f04e1236bd9edae2b83fb5d34f09c0d1aa16560de", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "b7c4dc975d0c8b22f1c1326f04e1236bd9edae2b83fb5d34f09c0d1aa16560de", kill_on_drop: false }` [INFO] [stdout] b7c4dc975d0c8b22f1c1326f04e1236bd9edae2b83fb5d34f09c0d1aa16560de [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 8f3f27bfe6f600628ef68d4adf70cf306f496d103d2a1f4e24f991debf47250f [INFO] running `Command { std: "docker" "start" "-a" "8f3f27bfe6f600628ef68d4adf70cf306f496d103d2a1f4e24f991debf47250f", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/main.rs:12:53 [INFO] [stderr] | [INFO] [stderr] 12 | fn from_port(number: usize) -> Result> { [INFO] [stderr] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stderr] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stderr] = note: for more information, see [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/main.rs:23:25 [INFO] [stderr] | [INFO] [stderr] 23 | ) -> Result<(), Box> { [INFO] [stderr] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stderr] | [INFO] [stderr] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stderr] = note: for more information, see [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/main.rs:35:85 [INFO] [stderr] | [INFO] [stderr] 35 | fn press(&mut self, notes: &[(Letter, Octave)], velocity: u8) -> Result<(), Box> { [INFO] [stderr] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stderr] | [INFO] [stderr] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stderr] = note: for more information, see [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/main.rs:46:87 [INFO] [stderr] | [INFO] [stderr] 46 | fn release(&mut self, notes: &[(Letter, Octave)], velocity: u8) -> Result<(), Box> { [INFO] [stderr] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stderr] | [INFO] [stderr] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stderr] = note: for more information, see [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/main.rs:84:21 [INFO] [stderr] | [INFO] [stderr] 84 | ) -> Result<(), Box> { [INFO] [stderr] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stderr] | [INFO] [stderr] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stderr] = note: for more information, see [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/main.rs:121:56 [INFO] [stderr] | [INFO] [stderr] 121 | fn clapping_music(piano: &mut Piano) -> Result<(), Box> { [INFO] [stderr] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stderr] | [INFO] [stderr] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stderr] = note: for more information, see [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/main.rs:140:29 [INFO] [stderr] | [INFO] [stderr] 140 | fn main() -> Result<(), Box> { [INFO] [stderr] | ^^^^^ help: use `dyn`: `dyn Error` [INFO] [stderr] | [INFO] [stderr] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stderr] = note: for more information, see [INFO] [stderr] [INFO] [stderr] warning: `clapping-music` (bin "clapping-music" test) generated 7 warnings [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.36s [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/clapping_music-325f3a17720fbd8b) [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "8f3f27bfe6f600628ef68d4adf70cf306f496d103d2a1f4e24f991debf47250f", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "8f3f27bfe6f600628ef68d4adf70cf306f496d103d2a1f4e24f991debf47250f", kill_on_drop: false }` [INFO] [stdout] 8f3f27bfe6f600628ef68d4adf70cf306f496d103d2a1f4e24f991debf47250f