[INFO] cloning repository https://github.com/JacksonGariety/nocfgwm
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JacksonGariety/nocfgwm" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJacksonGariety%2Fnocfgwm", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJacksonGariety%2Fnocfgwm'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] efabaf30c255fdf72e92461f0a2788bcfc6756c5
[INFO] testing JacksonGariety/nocfgwm against 1.47.0 for beta-1.48-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJacksonGariety%2Fnocfgwm" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/JacksonGariety/nocfgwm on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/JacksonGariety/nocfgwm
[INFO] finished tweaking git repo https://github.com/JacksonGariety/nocfgwm
[INFO] tweaked toml for git repo https://github.com/JacksonGariety/nocfgwm written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/JacksonGariety/nocfgwm already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 41fd16c739017263c43858489df960b497844146352885756df45a1cf75a8f84
[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" "41fd16c739017263c43858489df960b497844146352885756df45a1cf75a8f84", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "41fd16c739017263c43858489df960b497844146352885756df45a1cf75a8f84", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "41fd16c739017263c43858489df960b497844146352885756df45a1cf75a8f84", kill_on_drop: false }`
[INFO] [stdout] 41fd16c739017263c43858489df960b497844146352885756df45a1cf75a8f84
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 63cc10dea4a5ab59e1ef86c11b82c5cbe4708dc2e2330e7cd89ee525cec34dcb
[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" "63cc10dea4a5ab59e1ef86c11b82c5cbe4708dc2e2330e7cd89ee525cec34dcb", kill_on_drop: false }`
[INFO] [stderr]    Compiling toml v0.2.1
[INFO] [stderr]    Compiling error-chain v0.7.2
[INFO] [stderr]    Compiling metadeps v1.1.1
[INFO] [stderr]    Compiling x11 v2.12.0
[INFO] [stderr]    Compiling wm v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `revert`
[INFO] [stdout]    --> src/main.rs:142:21
[INFO] [stdout]     |
[INFO] [stdout] 142 |                 let mut revert: c_int = unsafe{zeroed()};
[INFO] [stdout]     |                     ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_revert`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `wmhints`
[INFO] [stdout]   --> src/window.rs:74:9
[INFO] [stdout]    |
[INFO] [stdout] 74 |     let wmhints: xlib::XWMHints;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_wmhints`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `state`
[INFO] [stdout]   --> src/window.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let state: i64;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_state`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `gc`
[INFO] [stdout]    --> src/window.rs:148:9
[INFO] [stdout]     |
[INFO] [stdout] 148 |     let gc: xlib::GC = win.title.gc;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_gc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `wmstart`
[INFO] [stdout]   --> src/window.rs:70:77
[INFO] [stdout]    |
[INFO] [stdout] 70 | pub fn manage(display: *mut xlib::Display, root: u64, client: xlib::Window, wmstart: i32, windows: &mut Vec<Window>) {
[INFO] [stdout]    |                                                                             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_wmstart`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:130:26
[INFO] [stdout]     |
[INFO] [stdout] 130 |                     Some(mut win) => {
[INFO] [stdout]     |                          ----^^^
[INFO] [stdout]     |                          |
[INFO] [stdout]     |                          help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:142:21
[INFO] [stdout]     |
[INFO] [stdout] 142 |                 let mut revert: c_int = unsafe{zeroed()};
[INFO] [stdout]     |                     ----^^^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/window.rs:106:42
[INFO] [stdout]     |
[INFO] [stdout] 93  |     unsafe {
[INFO] [stdout]     |     ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 106 |         let mut gcval: xlib::XGCValues = unsafe{zeroed()};
[INFO] [stdout]     |                                          ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/window.rs:108:29
[INFO] [stdout]     |
[INFO] [stdout] 93  |     unsafe {
[INFO] [stdout]     |     ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 108 |         let mut tp: Title = unsafe{zeroed()};
[INFO] [stdout]     |                             ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/window.rs:109:58
[INFO] [stdout]     |
[INFO] [stdout] 93  |     unsafe {
[INFO] [stdout]     |     ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 109 |         let mut title_attr: xlib::XSetWindowAttributes = unsafe{zeroed()};
[INFO] [stdout]     |                                                          ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/window.rs:124:36
[INFO] [stdout]     |
[INFO] [stdout] 93  |     unsafe {
[INFO] [stdout]     |     ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 124 |         let mut bg: xlib::XColor = unsafe{zeroed()};
[INFO] [stdout]     |                                    ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/window.rs:198:13
[INFO] [stdout]     |
[INFO] [stdout] 198 |             unsafe {
[INFO] [stdout]     |             ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.14s
[INFO] running `Command { std: "docker" "inspect" "63cc10dea4a5ab59e1ef86c11b82c5cbe4708dc2e2330e7cd89ee525cec34dcb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63cc10dea4a5ab59e1ef86c11b82c5cbe4708dc2e2330e7cd89ee525cec34dcb", kill_on_drop: false }`
[INFO] [stdout] 63cc10dea4a5ab59e1ef86c11b82c5cbe4708dc2e2330e7cd89ee525cec34dcb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a7a4e9ac191234b192c0e0c575d2509a077f6b56e98212a629b575f2f4facdab
[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" "a7a4e9ac191234b192c0e0c575d2509a077f6b56e98212a629b575f2f4facdab", kill_on_drop: false }`
[INFO] [stderr]    Compiling wm v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `revert`
[INFO] [stdout]    --> src/main.rs:142:21
[INFO] [stdout]     |
[INFO] [stdout] 142 |                 let mut revert: c_int = unsafe{zeroed()};
[INFO] [stdout]     |                     ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_revert`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `wmhints`
[INFO] [stdout]   --> src/window.rs:74:9
[INFO] [stdout]    |
[INFO] [stdout] 74 |     let wmhints: xlib::XWMHints;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_wmhints`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `state`
[INFO] [stdout]   --> src/window.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let state: i64;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_state`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `gc`
[INFO] [stdout]    --> src/window.rs:148:9
[INFO] [stdout]     |
[INFO] [stdout] 148 |     let gc: xlib::GC = win.title.gc;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_gc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `wmstart`
[INFO] [stdout]   --> src/window.rs:70:77
[INFO] [stdout]    |
[INFO] [stdout] 70 | pub fn manage(display: *mut xlib::Display, root: u64, client: xlib::Window, wmstart: i32, windows: &mut Vec<Window>) {
[INFO] [stdout]    |                                                                             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_wmstart`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:130:26
[INFO] [stdout]     |
[INFO] [stdout] 130 |                     Some(mut win) => {
[INFO] [stdout]     |                          ----^^^
[INFO] [stdout]     |                          |
[INFO] [stdout]     |                          help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:142:21
[INFO] [stdout]     |
[INFO] [stdout] 142 |                 let mut revert: c_int = unsafe{zeroed()};
[INFO] [stdout]     |                     ----^^^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/window.rs:106:42
[INFO] [stdout]     |
[INFO] [stdout] 93  |     unsafe {
[INFO] [stdout]     |     ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 106 |         let mut gcval: xlib::XGCValues = unsafe{zeroed()};
[INFO] [stdout]     |                                          ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/window.rs:108:29
[INFO] [stdout]     |
[INFO] [stdout] 93  |     unsafe {
[INFO] [stdout]     |     ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 108 |         let mut tp: Title = unsafe{zeroed()};
[INFO] [stdout]     |                             ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/window.rs:109:58
[INFO] [stdout]     |
[INFO] [stdout] 93  |     unsafe {
[INFO] [stdout]     |     ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 109 |         let mut title_attr: xlib::XSetWindowAttributes = unsafe{zeroed()};
[INFO] [stdout]     |                                                          ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/window.rs:124:36
[INFO] [stdout]     |
[INFO] [stdout] 93  |     unsafe {
[INFO] [stdout]     |     ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 124 |         let mut bg: xlib::XColor = unsafe{zeroed()};
[INFO] [stdout]     |                                    ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/window.rs:198:13
[INFO] [stdout]     |
[INFO] [stdout] 198 |             unsafe {
[INFO] [stdout]     |             ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.07s
[INFO] running `Command { std: "docker" "inspect" "a7a4e9ac191234b192c0e0c575d2509a077f6b56e98212a629b575f2f4facdab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7a4e9ac191234b192c0e0c575d2509a077f6b56e98212a629b575f2f4facdab", kill_on_drop: false }`
[INFO] [stdout] a7a4e9ac191234b192c0e0c575d2509a077f6b56e98212a629b575f2f4facdab
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f16c3da4b27078b60166dab4d70f69df68bb2611acf10a0f8190813bfbb2b83c
[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" "f16c3da4b27078b60166dab4d70f69df68bb2611acf10a0f8190813bfbb2b83c", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `revert`
[INFO] [stderr]    --> src/main.rs:142:21
[INFO] [stderr]     |
[INFO] [stderr] 142 |                 let mut revert: c_int = unsafe{zeroed()};
[INFO] [stderr]     |                     ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_revert`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `wmhints`
[INFO] [stderr]   --> src/window.rs:74:9
[INFO] [stderr]    |
[INFO] [stderr] 74 |     let wmhints: xlib::XWMHints;
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_wmhints`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `state`
[INFO] [stderr]   --> src/window.rs:75:9
[INFO] [stderr]    |
[INFO] [stderr] 75 |     let state: i64;
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_state`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `gc`
[INFO] [stderr]    --> src/window.rs:148:9
[INFO] [stderr]     |
[INFO] [stderr] 148 |     let gc: xlib::GC = win.title.gc;
[INFO] [stderr]     |         ^^ help: if this is intentional, prefix it with an underscore: `_gc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `wmstart`
[INFO] [stderr]   --> src/window.rs:70:77
[INFO] [stderr]    |
[INFO] [stderr] 70 | pub fn manage(display: *mut xlib::Display, root: u64, client: xlib::Window, wmstart: i32, windows: &mut Vec<Window>) {
[INFO] [stderr]    |                                                                             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_wmstart`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:130:26
[INFO] [stderr]     |
[INFO] [stderr] 130 |                     Some(mut win) => {
[INFO] [stderr]     |                          ----^^^
[INFO] [stderr]     |                          |
[INFO] [stderr]     |                          help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:142:21
[INFO] [stderr]     |
[INFO] [stderr] 142 |                 let mut revert: c_int = unsafe{zeroed()};
[INFO] [stderr]     |                     ----^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/window.rs:106:42
[INFO] [stderr]     |
[INFO] [stderr] 93  |     unsafe {
[INFO] [stderr]     |     ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 106 |         let mut gcval: xlib::XGCValues = unsafe{zeroed()};
[INFO] [stderr]     |                                          ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/window.rs:108:29
[INFO] [stderr]     |
[INFO] [stderr] 93  |     unsafe {
[INFO] [stderr]     |     ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 108 |         let mut tp: Title = unsafe{zeroed()};
[INFO] [stderr]     |                             ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/window.rs:109:58
[INFO] [stderr]     |
[INFO] [stderr] 93  |     unsafe {
[INFO] [stderr]     |     ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 109 |         let mut title_attr: xlib::XSetWindowAttributes = unsafe{zeroed()};
[INFO] [stderr]     |                                                          ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/window.rs:124:36
[INFO] [stderr]     |
[INFO] [stderr] 93  |     unsafe {
[INFO] [stderr]     |     ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 124 |         let mut bg: xlib::XColor = unsafe{zeroed()};
[INFO] [stderr]     |                                    ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/window.rs:198:13
[INFO] [stderr]     |
[INFO] [stderr] 198 |             unsafe {
[INFO] [stderr]     |             ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: 12 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/wm-9278b7b420eeb240
[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
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f16c3da4b27078b60166dab4d70f69df68bb2611acf10a0f8190813bfbb2b83c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f16c3da4b27078b60166dab4d70f69df68bb2611acf10a0f8190813bfbb2b83c", kill_on_drop: false }`
[INFO] [stdout] f16c3da4b27078b60166dab4d70f69df68bb2611acf10a0f8190813bfbb2b83c
