[INFO] cloning repository https://github.com/realSuffix/simple_wm
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/realSuffix/simple_wm" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FrealSuffix%2Fsimple_wm", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FrealSuffix%2Fsimple_wm'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e43c9158c5d36b7f61da0f665d7d20657af09f4b
[INFO] testing realSuffix/simple_wm against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FrealSuffix%2Fsimple_wm" "/workspace/builds/worker-27/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-27/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/realSuffix/simple_wm on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/realSuffix/simple_wm
[INFO] finished tweaking git repo https://github.com/realSuffix/simple_wm
[INFO] tweaked toml for git repo https://github.com/realSuffix/simple_wm written to /workspace/builds/worker-27/source/Cargo.toml
[INFO] crate git repo https://github.com/realSuffix/simple_wm already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "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-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eb8f38d3907f1e1c95746c23ac10e48d830a773175978426116433b733a32b97
[INFO] running `Command { std: "docker" "start" "-a" "eb8f38d3907f1e1c95746c23ac10e48d830a773175978426116433b733a32b97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb8f38d3907f1e1c95746c23ac10e48d830a773175978426116433b733a32b97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb8f38d3907f1e1c95746c23ac10e48d830a773175978426116433b733a32b97", kill_on_drop: false }`
[INFO] [stdout] eb8f38d3907f1e1c95746c23ac10e48d830a773175978426116433b733a32b97
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8d66dc820068ae36bd7955d110c1233af36e5001c5e3ae2888e594528ab49177
[INFO] running `Command { std: "docker" "start" "-a" "8d66dc820068ae36bd7955d110c1233af36e5001c5e3ae2888e594528ab49177", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.60
[INFO] [stderr]    Compiling serde_derive v1.0.123
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling serde v1.0.123
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling libc v0.2.86
[INFO] [stderr]    Compiling serde_json v1.0.62
[INFO] [stderr]    Compiling itoa v0.4.7
[INFO] [stderr]    Compiling x11 v2.18.2
[INFO] [stderr]    Compiling quote v1.0.8
[INFO] [stderr]    Compiling simple_wm v0.1.0 (/opt/rustwide/workdir/simple_wm)
[INFO] [stdout] warning: unused variable: `tag`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |         tag: &mut Tag,
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_tag`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `shift_by`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |         shift_by: usize,
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_shift_by`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `system`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |         system: &WindowSystem,
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_system`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `current`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |         current: Option<Window>,
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_current`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tag`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |         tag: &mut Tag,
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_tag`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `shift_by`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:76:9
[INFO] [stdout]    |
[INFO] [stdout] 76 |         shift_by: usize,
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_shift_by`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `system`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:77:9
[INFO] [stdout]    |
[INFO] [stdout] 77 |         system: &WindowSystem,
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_system`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `current`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |         current: Option<Window>,
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_current`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `move_horizontal`
[INFO] [stdout]   --> simple_wm/src/client.rs:43:12
[INFO] [stdout]    |
[INFO] [stdout] 43 |     pub fn move_horizontal(&mut self, amount: i32, move_x: bool, window_system: &WindowSystem) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unmap`
[INFO] [stdout]   --> simple_wm/src/client.rs:69:12
[INFO] [stdout]    |
[INFO] [stdout] 69 |     pub fn unmap(&self, window_system: &WindowSystem) {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Direction`
[INFO] [stdout]  --> simple_wm/src/models/mod.rs:1:10
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub enum Direction {
[INFO] [stdout]   |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_windows_mut`
[INFO] [stdout]   --> simple_wm/src/tag/tag.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn get_windows_mut(&mut self) -> &mut [Client] {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 16.01s
[INFO] running `Command { std: "docker" "inspect" "8d66dc820068ae36bd7955d110c1233af36e5001c5e3ae2888e594528ab49177", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d66dc820068ae36bd7955d110c1233af36e5001c5e3ae2888e594528ab49177", kill_on_drop: false }`
[INFO] [stdout] 8d66dc820068ae36bd7955d110c1233af36e5001c5e3ae2888e594528ab49177
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 76c9eb4f842b47f59d857ff8549716139618f5db1eb5fa18519d03926c6b1305
[INFO] running `Command { std: "docker" "start" "-a" "76c9eb4f842b47f59d857ff8549716139618f5db1eb5fa18519d03926c6b1305", kill_on_drop: false }`
[INFO] [stderr]    Compiling simple_wm v0.1.0 (/opt/rustwide/workdir/simple_wm)
[INFO] [stdout] warning: unused variable: `tag`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |         tag: &mut Tag,
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_tag`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `shift_by`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |         shift_by: usize,
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_shift_by`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `system`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |         system: &WindowSystem,
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_system`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `current`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |         current: Option<Window>,
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_current`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tag`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |         tag: &mut Tag,
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_tag`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `shift_by`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:76:9
[INFO] [stdout]    |
[INFO] [stdout] 76 |         shift_by: usize,
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_shift_by`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `system`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:77:9
[INFO] [stdout]    |
[INFO] [stdout] 77 |         system: &WindowSystem,
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_system`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `current`
[INFO] [stdout]   --> simple_wm/src/layout/stack_layout.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |         current: Option<Window>,
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_current`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `move_horizontal`
[INFO] [stdout]   --> simple_wm/src/client.rs:43:12
[INFO] [stdout]    |
[INFO] [stdout] 43 |     pub fn move_horizontal(&mut self, amount: i32, move_x: bool, window_system: &WindowSystem) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unmap`
[INFO] [stdout]   --> simple_wm/src/client.rs:69:12
[INFO] [stdout]    |
[INFO] [stdout] 69 |     pub fn unmap(&self, window_system: &WindowSystem) {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Direction`
[INFO] [stdout]  --> simple_wm/src/models/mod.rs:1:10
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub enum Direction {
[INFO] [stdout]   |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_windows_mut`
[INFO] [stdout]   --> simple_wm/src/tag/tag.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn get_windows_mut(&mut self) -> &mut [Client] {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.76s
[INFO] running `Command { std: "docker" "inspect" "76c9eb4f842b47f59d857ff8549716139618f5db1eb5fa18519d03926c6b1305", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "76c9eb4f842b47f59d857ff8549716139618f5db1eb5fa18519d03926c6b1305", kill_on_drop: false }`
[INFO] [stdout] 76c9eb4f842b47f59d857ff8549716139618f5db1eb5fa18519d03926c6b1305
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] c642ad53be251727474bc2317efcb42a95a1fac10a18552962607af64540d8b8
[INFO] running `Command { std: "docker" "start" "-a" "c642ad53be251727474bc2317efcb42a95a1fac10a18552962607af64540d8b8", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `tag`
[INFO] [stderr]   --> simple_wm/src/layout/stack_layout.rs:66:9
[INFO] [stderr]    |
[INFO] [stderr] 66 |         tag: &mut Tag,
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_tag`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `shift_by`
[INFO] [stderr]   --> simple_wm/src/layout/stack_layout.rs:67:9
[INFO] [stderr]    |
[INFO] [stderr] 67 |         shift_by: usize,
[INFO] [stderr]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_shift_by`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `system`
[INFO] [stderr]   --> simple_wm/src/layout/stack_layout.rs:68:9
[INFO] [stderr]    |
[INFO] [stderr] 68 |         system: &WindowSystem,
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_system`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `current`
[INFO] [stderr]   --> simple_wm/src/layout/stack_layout.rs:69:9
[INFO] [stderr]    |
[INFO] [stderr] 69 |         current: Option<Window>,
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_current`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tag`
[INFO] [stderr]   --> simple_wm/src/layout/stack_layout.rs:75:9
[INFO] [stderr]    |
[INFO] [stderr] 75 |         tag: &mut Tag,
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_tag`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `shift_by`
[INFO] [stderr]   --> simple_wm/src/layout/stack_layout.rs:76:9
[INFO] [stderr]    |
[INFO] [stderr] 76 |         shift_by: usize,
[INFO] [stderr]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_shift_by`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `system`
[INFO] [stderr]   --> simple_wm/src/layout/stack_layout.rs:77:9
[INFO] [stderr]    |
[INFO] [stderr] 77 |         system: &WindowSystem,
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_system`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `current`
[INFO] [stderr]   --> simple_wm/src/layout/stack_layout.rs:78:9
[INFO] [stderr]    |
[INFO] [stderr] 78 |         current: Option<Window>,
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_current`
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `move_horizontal`
[INFO] [stderr]   --> simple_wm/src/client.rs:43:12
[INFO] [stderr]    |
[INFO] [stderr] 43 |     pub fn move_horizontal(&mut self, amount: i32, move_x: bool, window_system: &WindowSystem) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `unmap`
[INFO] [stderr]   --> simple_wm/src/client.rs:69:12
[INFO] [stderr]    |
[INFO] [stderr] 69 |     pub fn unmap(&self, window_system: &WindowSystem) {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Direction`
[INFO] [stderr]  --> simple_wm/src/models/mod.rs:1:10
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub enum Direction {
[INFO] [stderr]   |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `get_windows_mut`
[INFO] [stderr]   --> simple_wm/src/tag/tag.rs:26:12
[INFO] [stderr]    |
[INFO] [stderr] 26 |     pub fn get_windows_mut(&mut self) -> &mut [Client] {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `simple_wm` (bin "simple_wm" test) generated 12 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/simple_wm-8aaf8c9af131b96c)
[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" "c642ad53be251727474bc2317efcb42a95a1fac10a18552962607af64540d8b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c642ad53be251727474bc2317efcb42a95a1fac10a18552962607af64540d8b8", kill_on_drop: false }`
[INFO] [stdout] c642ad53be251727474bc2317efcb42a95a1fac10a18552962607af64540d8b8