[INFO] cloning repository https://github.com/And678/tree-game [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/And678/tree-game" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAnd678%2Ftree-game", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAnd678%2Ftree-game'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] f8e307a82892d257bd8e78d428933593f7152bff [INFO] testing And678/tree-game against 1.60.0 for beta-1.61-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAnd678%2Ftree-game" "/workspace/builds/worker-51/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-51/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/And678/tree-game on toolchain 1.60.0 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/And678/tree-game [INFO] finished tweaking git repo https://github.com/And678/tree-game [INFO] tweaked toml for git repo https://github.com/And678/tree-game written to /workspace/builds/worker-51/source/Cargo.toml [INFO] crate git repo https://github.com/And678/tree-game already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "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-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] bca971b9b1f032279c9df8d737ddc6cdad22c1e7205d00d24eb76fa0c8f31fe7 [INFO] running `Command { std: "docker" "start" "-a" "bca971b9b1f032279c9df8d737ddc6cdad22c1e7205d00d24eb76fa0c8f31fe7", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "bca971b9b1f032279c9df8d737ddc6cdad22c1e7205d00d24eb76fa0c8f31fe7", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "bca971b9b1f032279c9df8d737ddc6cdad22c1e7205d00d24eb76fa0c8f31fe7", kill_on_drop: false }` [INFO] [stdout] bca971b9b1f032279c9df8d737ddc6cdad22c1e7205d00d24eb76fa0c8f31fe7 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 6a82e55da1caba8a67be7e77aa74c2ea64566e275a2bc7e8ba292082aac68a02 [INFO] running `Command { std: "docker" "start" "-a" "6a82e55da1caba8a67be7e77aa74c2ea64566e275a2bc7e8ba292082aac68a02", 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] [stderr] Compiling autocfg v0.1.4 [INFO] [stderr] Compiling libc v0.2.58 [INFO] [stderr] Compiling cc v1.0.37 [INFO] [stderr] Compiling libm v0.1.3 [INFO] [stderr] Compiling numtoa v0.1.0 [INFO] [stderr] Compiling claxon v0.4.2 [INFO] [stderr] Compiling num-traits v0.2.8 [INFO] [stderr] Compiling rand_chacha v0.1.1 [INFO] [stderr] Compiling rand_pcg v0.1.2 [INFO] [stderr] Compiling rand v0.6.5 [INFO] [stderr] Compiling minimp3-sys v0.3.1 [INFO] [stderr] Compiling rand_os v0.1.3 [INFO] [stderr] Compiling slice-deque v0.2.4 [INFO] [stderr] Compiling alsa-sys v0.1.2 [INFO] [stderr] Compiling termion v1.5.2 [INFO] [stderr] Compiling cpal v0.8.2 [INFO] [stderr] Compiling minimp3 v0.3.3 [INFO] [stderr] Compiling num-complex v0.2.1 [INFO] [stderr] Compiling approx v0.3.2 [INFO] [stderr] Compiling alga v0.9.1 [INFO] [stderr] Compiling nalgebra v0.18.0 [INFO] [stderr] Compiling rodio v0.9.0 [INFO] [stderr] Compiling tree_game v0.9.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:102:23 [INFO] [stdout] | [INFO] [stdout] 102 | fn clear(stdout: &mut Write) { [INFO] [stdout] | ^^^^^ [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] help: use `dyn` [INFO] [stdout] | [INFO] [stdout] 102 - fn clear(stdout: &mut Write) { [INFO] [stdout] 102 + fn clear(stdout: &mut dyn Write) { [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:111:30 [INFO] [stdout] | [INFO] [stdout] 111 | fn render_timer(stdout: &mut Write, total: u64, current: u64) { [INFO] [stdout] | ^^^^^ [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] help: use `dyn` [INFO] [stdout] | [INFO] [stdout] 111 - fn render_timer(stdout: &mut Write, total: u64, current: u64) { [INFO] [stdout] 111 + fn render_timer(stdout: &mut dyn Write, total: u64, current: u64) { [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:134:24 [INFO] [stdout] | [INFO] [stdout] 134 | fn render(stdout: &mut Write, level: &Vec, score: i32, trees: i32, last_action: Actions) { [INFO] [stdout] | ^^^^^ [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] help: use `dyn` [INFO] [stdout] | [INFO] [stdout] 134 - fn render(stdout: &mut Write, level: &Vec, score: i32, trees: i32, last_action: Actions) { [INFO] [stdout] 134 + fn render(stdout: &mut dyn Write, level: &Vec, score: i32, trees: i32, last_action: Actions) { [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:179:33 [INFO] [stdout] | [INFO] [stdout] 179 | fn render_gameover(stdout: &mut Write) { [INFO] [stdout] | ^^^^^ [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] help: use `dyn` [INFO] [stdout] | [INFO] [stdout] 179 - fn render_gameover(stdout: &mut Write) { [INFO] [stdout] 179 + fn render_gameover(stdout: &mut dyn Write) { [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:191:26 [INFO] [stdout] | [INFO] [stdout] 191 | fn read_key(reader: &mut Read) -> Actions { [INFO] [stdout] | ^^^^ [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] help: use `dyn` [INFO] [stdout] | [INFO] [stdout] 191 - fn read_key(reader: &mut Read) -> Actions { [INFO] [stdout] 191 + fn read_key(reader: &mut dyn Read) -> Actions { [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 2m 12s [INFO] running `Command { std: "docker" "inspect" "6a82e55da1caba8a67be7e77aa74c2ea64566e275a2bc7e8ba292082aac68a02", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "6a82e55da1caba8a67be7e77aa74c2ea64566e275a2bc7e8ba292082aac68a02", kill_on_drop: false }` [INFO] [stdout] 6a82e55da1caba8a67be7e77aa74c2ea64566e275a2bc7e8ba292082aac68a02 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 7f05012bef82386392cd0eb34c347f474d912bb373655f1dcb64a60ba3b0dbf5 [INFO] running `Command { std: "docker" "start" "-a" "7f05012bef82386392cd0eb34c347f474d912bb373655f1dcb64a60ba3b0dbf5", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Compiling tree_game v0.9.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:102:23 [INFO] [stdout] | [INFO] [stdout] 102 | fn clear(stdout: &mut Write) { [INFO] [stdout] | ^^^^^ [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] help: use `dyn` [INFO] [stdout] | [INFO] [stdout] 102 - fn clear(stdout: &mut Write) { [INFO] [stdout] 102 + fn clear(stdout: &mut dyn Write) { [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:111:30 [INFO] [stdout] | [INFO] [stdout] 111 | fn render_timer(stdout: &mut Write, total: u64, current: u64) { [INFO] [stdout] | ^^^^^ [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] help: use `dyn` [INFO] [stdout] | [INFO] [stdout] 111 - fn render_timer(stdout: &mut Write, total: u64, current: u64) { [INFO] [stdout] 111 + fn render_timer(stdout: &mut dyn Write, total: u64, current: u64) { [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:134:24 [INFO] [stdout] | [INFO] [stdout] 134 | fn render(stdout: &mut Write, level: &Vec, score: i32, trees: i32, last_action: Actions) { [INFO] [stdout] | ^^^^^ [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] help: use `dyn` [INFO] [stdout] | [INFO] [stdout] 134 - fn render(stdout: &mut Write, level: &Vec, score: i32, trees: i32, last_action: Actions) { [INFO] [stdout] 134 + fn render(stdout: &mut dyn Write, level: &Vec, score: i32, trees: i32, last_action: Actions) { [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:179:33 [INFO] [stdout] | [INFO] [stdout] 179 | fn render_gameover(stdout: &mut Write) { [INFO] [stdout] | ^^^^^ [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] help: use `dyn` [INFO] [stdout] | [INFO] [stdout] 179 - fn render_gameover(stdout: &mut Write) { [INFO] [stdout] 179 + fn render_gameover(stdout: &mut dyn Write) { [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/main.rs:191:26 [INFO] [stdout] | [INFO] [stdout] 191 | fn read_key(reader: &mut Read) -> Actions { [INFO] [stdout] | ^^^^ [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] help: use `dyn` [INFO] [stdout] | [INFO] [stdout] 191 - fn read_key(reader: &mut Read) -> Actions { [INFO] [stdout] 191 + fn read_key(reader: &mut dyn Read) -> Actions { [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 2.58s [INFO] running `Command { std: "docker" "inspect" "7f05012bef82386392cd0eb34c347f474d912bb373655f1dcb64a60ba3b0dbf5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "7f05012bef82386392cd0eb34c347f474d912bb373655f1dcb64a60ba3b0dbf5", kill_on_drop: false }` [INFO] [stdout] 7f05012bef82386392cd0eb34c347f474d912bb373655f1dcb64a60ba3b0dbf5 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 6b6ceb6c2040f287d2b4fba06b66b8445d22055ba0ce06924c8d94cf52ea5857 [INFO] running `Command { std: "docker" "start" "-a" "6b6ceb6c2040f287d2b4fba06b66b8445d22055ba0ce06924c8d94cf52ea5857", 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] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] [INFO] [stderr] --> src/main.rs:102:23 [INFO] [stdout] running 0 tests [INFO] [stderr] | [INFO] [stdout] [INFO] [stderr] 102 | fn clear(stdout: &mut Write) { [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stderr] | ^^^^^ [INFO] [stdout] [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] help: use `dyn` [INFO] [stderr] | [INFO] [stderr] 102 - fn clear(stdout: &mut Write) { [INFO] [stderr] 102 + fn clear(stdout: &mut dyn Write) { [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/main.rs:111:30 [INFO] [stderr] | [INFO] [stderr] 111 | fn render_timer(stdout: &mut Write, total: u64, current: u64) { [INFO] [stderr] | ^^^^^ [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] help: use `dyn` [INFO] [stderr] | [INFO] [stderr] 111 - fn render_timer(stdout: &mut Write, total: u64, current: u64) { [INFO] [stderr] 111 + fn render_timer(stdout: &mut dyn Write, total: u64, current: u64) { [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/main.rs:134:24 [INFO] [stderr] | [INFO] [stderr] 134 | fn render(stdout: &mut Write, level: &Vec, score: i32, trees: i32, last_action: Actions) { [INFO] [stderr] | ^^^^^ [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] help: use `dyn` [INFO] [stderr] | [INFO] [stderr] 134 - fn render(stdout: &mut Write, level: &Vec, score: i32, trees: i32, last_action: Actions) { [INFO] [stderr] 134 + fn render(stdout: &mut dyn Write, level: &Vec, score: i32, trees: i32, last_action: Actions) { [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/main.rs:179:33 [INFO] [stderr] | [INFO] [stderr] 179 | fn render_gameover(stdout: &mut Write) { [INFO] [stderr] | ^^^^^ [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] help: use `dyn` [INFO] [stderr] | [INFO] [stderr] 179 - fn render_gameover(stdout: &mut Write) { [INFO] [stderr] 179 + fn render_gameover(stdout: &mut dyn Write) { [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/main.rs:191:26 [INFO] [stderr] | [INFO] [stderr] 191 | fn read_key(reader: &mut Read) -> Actions { [INFO] [stderr] | ^^^^ [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] help: use `dyn` [INFO] [stderr] | [INFO] [stderr] 191 - fn read_key(reader: &mut Read) -> Actions { [INFO] [stderr] 191 + fn read_key(reader: &mut dyn Read) -> Actions { [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] warning: `tree_game` (bin "tree_game" test) generated 5 warnings [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.28s [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/tree_game-f4a842588a24a806) [INFO] running `Command { std: "docker" "inspect" "6b6ceb6c2040f287d2b4fba06b66b8445d22055ba0ce06924c8d94cf52ea5857", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "6b6ceb6c2040f287d2b4fba06b66b8445d22055ba0ce06924c8d94cf52ea5857", kill_on_drop: false }` [INFO] [stdout] 6b6ceb6c2040f287d2b4fba06b66b8445d22055ba0ce06924c8d94cf52ea5857