[INFO] cloning repository https://github.com/shmishtopher/GPIO
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shmishtopher/GPIO" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshmishtopher%2FGPIO", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshmishtopher%2FGPIO'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6a50bb37e640a958686bb3281b8991967392f635
[INFO] checking shmishtopher/GPIO against eca445e5ae4a6679cc27d3a09106ce245e13a5a6 for pr-162478
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshmishtopher%2FGPIO" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/shmishtopher/GPIO
[INFO] finished tweaking git repo https://github.com/shmishtopher/GPIO
[INFO] tweaked toml for git repo https://github.com/shmishtopher/GPIO written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/shmishtopher/GPIO on toolchain eca445e5ae4a6679cc27d3a09106ce245e13a5a6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+eca445e5ae4a6679cc27d3a09106ce245e13a5a6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/shmishtopher/GPIO already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+eca445e5ae4a6679cc27d3a09106ce245e13a5a6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: Cargo.toml: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024`
[INFO] [stderr] warning: Cargo.toml: unused manifest key: target.arm-unknown-linux-gnueabihf.linker
[INFO] [stderr] warning: `AR_GPIO` (manifest) generated 2 warnings
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded cfg-if v0.1.3
[INFO] [stderr]   Downloaded cc v1.0.17
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 9f6b5162e4c0786949e1b9350a6d21b3c6bd10f604d60d3aa9d745296b5443c0
[INFO] running `Command { std: "docker" "start" "9f6b5162e4c0786949e1b9350a6d21b3c6bd10f604d60d3aa9d745296b5443c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9f6b5162e4c0786949e1b9350a6d21b3c6bd10f604d60d3aa9d745296b5443c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "9f6b5162e4c0786949e1b9350a6d21b3c6bd10f604d60d3aa9d745296b5443c0" "/opt/rustwide/cargo-home/bin/cargo" "+eca445e5ae4a6679cc27d3a09106ce245e13a5a6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9f6b5162e4c0786949e1b9350a6d21b3c6bd10f604d60d3aa9d745296b5443c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "9f6b5162e4c0786949e1b9350a6d21b3c6bd10f604d60d3aa9d745296b5443c0" "/opt/rustwide/cargo-home/bin/cargo" "+eca445e5ae4a6679cc27d3a09106ce245e13a5a6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] warning: Cargo.toml: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024`
[INFO] [stderr] warning: Cargo.toml: unused manifest key: target.arm-unknown-linux-gnueabihf.linker
[INFO] [stderr] warning: `AR_GPIO` (manifest) generated 2 warnings
[INFO] [stderr]     Checking bitflags v1.0.3
[INFO] [stderr]     Checking cfg-if v0.1.3
[INFO] [stderr]     Checking libc v0.2.42
[INFO] [stderr]     Checking nix v0.11.0
[INFO] [stderr]     Checking AR_GPIO v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]   --> src/ar_gpio.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub extern fn gpiochip_create (fd: i32) -> *mut gpiochip_info {
[INFO] [stdout]    |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(missing_abi)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]   --> src/ar_gpio.rs:64:5
[INFO] [stdout]    |
[INFO] [stdout] 64 | pub extern fn gpiochip_name (ptr: *mut gpiochip_info) -> *mut [u8; 32] {
[INFO] [stdout]    |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]   --> src/ar_gpio.rs:72:5
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub extern fn gpiochip_label (ptr: *mut gpiochip_info) -> *mut [u8; 32] {
[INFO] [stdout]    |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]   --> src/ar_gpio.rs:80:5
[INFO] [stdout]    |
[INFO] [stdout] 80 | pub extern fn gpiochip_lines (ptr: *mut gpiochip_info) -> u32 {
[INFO] [stdout]    |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]   --> src/ar_gpio.rs:86:5
[INFO] [stdout]    |
[INFO] [stdout] 86 | pub extern fn gpiochip_destroy (ptr: *mut gpiochip_info) {
[INFO] [stdout]    |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]   --> src/ar_gpio.rs:92:5
[INFO] [stdout]    |
[INFO] [stdout] 92 | pub extern fn gpioline_create (fd: i32, line: u32) -> *mut gpioline_info {
[INFO] [stdout]    |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:109:5
[INFO] [stdout]     |
[INFO] [stdout] 109 | pub extern fn gpioline_offset (ptr: *mut gpioline_info) -> u32 {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:115:5
[INFO] [stdout]     |
[INFO] [stdout] 115 | pub extern fn gpioline_flags (ptr: *mut gpioline_info) -> u32 {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:121:5
[INFO] [stdout]     |
[INFO] [stdout] 121 | pub extern fn gpioline_name (ptr: *mut gpioline_info) -> *mut [u8; 32] {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:129:5
[INFO] [stdout]     |
[INFO] [stdout] 129 | pub extern fn gpioline_consumer (ptr: *mut gpioline_info) -> *mut [u8; 32] {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:137:5
[INFO] [stdout]     |
[INFO] [stdout] 137 | pub extern fn gpioline_destroy (ptr: *mut gpioline_info) {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:143:5
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub extern fn gpiohandle_request (fd: i32, line: u32, flags: u32) -> i32 {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:164:5
[INFO] [stdout]     |
[INFO] [stdout] 164 | pub extern fn gpioline_set (fd: i32, value: u8) {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:171:5
[INFO] [stdout]     |
[INFO] [stdout] 171 | pub extern fn gpioline_get (fd: i32) -> u8 {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]   --> src/ar_gpio.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub extern fn gpiochip_create (fd: i32) -> *mut gpiochip_info {
[INFO] [stdout]    |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(missing_abi)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]   --> src/ar_gpio.rs:64:5
[INFO] [stdout]    |
[INFO] [stdout] 64 | pub extern fn gpiochip_name (ptr: *mut gpiochip_info) -> *mut [u8; 32] {
[INFO] [stdout]    |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]   --> src/ar_gpio.rs:72:5
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub extern fn gpiochip_label (ptr: *mut gpiochip_info) -> *mut [u8; 32] {
[INFO] [stdout]    |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]   --> src/ar_gpio.rs:80:5
[INFO] [stdout]    |
[INFO] [stdout] 80 | pub extern fn gpiochip_lines (ptr: *mut gpiochip_info) -> u32 {
[INFO] [stdout]    |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]   --> src/ar_gpio.rs:86:5
[INFO] [stdout]    |
[INFO] [stdout] 86 | pub extern fn gpiochip_destroy (ptr: *mut gpiochip_info) {
[INFO] [stdout]    |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]   --> src/ar_gpio.rs:92:5
[INFO] [stdout]    |
[INFO] [stdout] 92 | pub extern fn gpioline_create (fd: i32, line: u32) -> *mut gpioline_info {
[INFO] [stdout]    |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:109:5
[INFO] [stdout]     |
[INFO] [stdout] 109 | pub extern fn gpioline_offset (ptr: *mut gpioline_info) -> u32 {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:115:5
[INFO] [stdout]     |
[INFO] [stdout] 115 | pub extern fn gpioline_flags (ptr: *mut gpioline_info) -> u32 {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:121:5
[INFO] [stdout]     |
[INFO] [stdout] 121 | pub extern fn gpioline_name (ptr: *mut gpioline_info) -> *mut [u8; 32] {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:129:5
[INFO] [stdout]     |
[INFO] [stdout] 129 | pub extern fn gpioline_consumer (ptr: *mut gpioline_info) -> *mut [u8; 32] {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:137:5
[INFO] [stdout]     |
[INFO] [stdout] 137 | pub extern fn gpioline_destroy (ptr: *mut gpioline_info) {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:143:5
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub extern fn gpiohandle_request (fd: i32, line: u32, flags: u32) -> i32 {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:164:5
[INFO] [stdout]     |
[INFO] [stdout] 164 | pub extern fn gpioline_set (fd: i32, value: u8) {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` declarations without an explicit ABI are deprecated
[INFO] [stdout]    --> src/ar_gpio.rs:171:5
[INFO] [stdout]     |
[INFO] [stdout] 171 | pub extern fn gpioline_get (fd: i32) -> u8 {
[INFO] [stdout]     |     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/ar_gpio.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 58 |     get_chip_info(fd, &mut info);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let _ = get_chip_info(fd, &mut info);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/ar_gpio.rs:103:5
[INFO] [stdout]     |
[INFO] [stdout] 103 |     get_line_info(fd, &mut info);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let _ = get_line_info(fd, &mut info);
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/ar_gpio.rs:159:12
[INFO] [stdout]     |
[INFO] [stdout] 159 |   unsafe { get_line_handle(fd, &mut request); }
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 159 |   unsafe { let _ = get_line_handle(fd, &mut request); }
[INFO] [stdout]     |            +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/ar_gpio.rs:167:12
[INFO] [stdout]     |
[INFO] [stdout] 167 |   unsafe { set_line_values(fd, &mut data); }
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 167 |   unsafe { let _ = set_line_values(fd, &mut data); }
[INFO] [stdout]     |            +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/ar_gpio.rs:173:12
[INFO] [stdout]     |
[INFO] [stdout] 173 |   unsafe { get_line_values(fd, &mut data); }
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 173 |   unsafe { let _ = get_line_values(fd, &mut data); }
[INFO] [stdout]     |            +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/ar_gpio.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 58 |     get_chip_info(fd, &mut info);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let _ = get_chip_info(fd, &mut info);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/ar_gpio.rs:103:5
[INFO] [stdout]     |
[INFO] [stdout] 103 |     get_line_info(fd, &mut info);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let _ = get_line_info(fd, &mut info);
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/ar_gpio.rs:159:12
[INFO] [stdout]     |
[INFO] [stdout] 159 |   unsafe { get_line_handle(fd, &mut request); }
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 159 |   unsafe { let _ = get_line_handle(fd, &mut request); }
[INFO] [stdout]     |            +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/ar_gpio.rs:167:12
[INFO] [stdout]     |
[INFO] [stdout] 167 |   unsafe { set_line_values(fd, &mut data); }
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 167 |   unsafe { let _ = set_line_values(fd, &mut data); }
[INFO] [stdout]     |            +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/ar_gpio.rs:173:12
[INFO] [stdout]     |
[INFO] [stdout] 173 |   unsafe { get_line_values(fd, &mut data); }
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 173 |   unsafe { let _ = get_line_values(fd, &mut data); }
[INFO] [stdout]     |            +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.76s
[INFO] running `Command { std: "docker" "inspect" "9f6b5162e4c0786949e1b9350a6d21b3c6bd10f604d60d3aa9d745296b5443c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f6b5162e4c0786949e1b9350a6d21b3c6bd10f604d60d3aa9d745296b5443c0", kill_on_drop: false }`
[INFO] [stdout] 9f6b5162e4c0786949e1b9350a6d21b3c6bd10f604d60d3aa9d745296b5443c0
