[INFO] cloning repository https://github.com/sabinonweb/pngme
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sabinonweb/pngme" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsabinonweb%2Fpngme", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsabinonweb%2Fpngme'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d0fc1216e2db8ccb74a054c9ca595676bdc34d32
[INFO] checking sabinonweb/pngme against master#96cfc75584359ae7ad11cc45968059f29e7b44b7 for pr-137728
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsabinonweb%2Fpngme" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sabinonweb/pngme on toolchain 96cfc75584359ae7ad11cc45968059f29e7b44b7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+96cfc75584359ae7ad11cc45968059f29e7b44b7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sabinonweb/pngme
[INFO] finished tweaking git repo https://github.com/sabinonweb/pngme
[INFO] tweaked toml for git repo https://github.com/sabinonweb/pngme written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/sabinonweb/pngme 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" "+96cfc75584359ae7ad11cc45968059f29e7b44b7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+96cfc75584359ae7ad11cc45968059f29e7b44b7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c57459124485a071d507da9db3392914e9a06eb734b6bf64331a2d244886715c
[INFO] running `Command { std: "docker" "start" "-a" "c57459124485a071d507da9db3392914e9a06eb734b6bf64331a2d244886715c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c57459124485a071d507da9db3392914e9a06eb734b6bf64331a2d244886715c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c57459124485a071d507da9db3392914e9a06eb734b6bf64331a2d244886715c", kill_on_drop: false }`
[INFO] [stdout] c57459124485a071d507da9db3392914e9a06eb734b6bf64331a2d244886715c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "RUSTDOCFLAGS=--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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+96cfc75584359ae7ad11cc45968059f29e7b44b7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 164204f9b425a15cd197dea11ff5dd2cfa0978855e6361b14e2df00f6124cd70
[INFO] running `Command { std: "docker" "start" "-a" "164204f9b425a15cd197dea11ff5dd2cfa0978855e6361b14e2df00f6124cd70", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.69
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]     Checking utf8parse v0.2.1
[INFO] [stderr]     Checking anstyle-query v1.0.0
[INFO] [stderr]     Checking anstyle v1.0.4
[INFO] [stderr]     Checking colorchoice v1.0.0
[INFO] [stderr]     Checking clap_lex v0.6.0
[INFO] [stderr]    Compiling heck v0.4.1
[INFO] [stderr]     Checking strsim v0.10.0
[INFO] [stderr]     Checking crc-catalog v2.4.0
[INFO] [stderr]     Checking anstyle-parse v0.2.2
[INFO] [stderr]     Checking crc v3.0.1
[INFO] [stderr]     Checking anstream v0.6.4
[INFO] [stderr]     Checking clap_builder v4.4.8
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]    Compiling syn v2.0.39
[INFO] [stderr]    Compiling clap_derive v4.4.7
[INFO] [stderr]     Checking clap v4.4.8
[INFO] [stderr]     Checking pngme v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/png.rs:37:13
[INFO] [stdout]    |
[INFO] [stdout] 37 |         let mut file = fs::read(path)?;
[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/png.rs:111:13
[INFO] [stdout]     |
[INFO] [stdout] 111 |         let mut current = HEADER_SIZE;
[INFO] [stdout]     |             ----^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `is_critical`, `is_public`, `is_reserved_bit_valid`, `is_safe_to_copy`, `is_valid`, and `is_valid_byte` are never used
[INFO] [stdout]   --> src/chunk_type.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl ChunkType {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn is_critical(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     pub fn is_public(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn is_reserved_bit_valid(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 37 |     pub fn is_safe_to_copy(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 43 |     pub fn is_valid(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 48 |     pub fn is_valid_byte(byte: u8) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/chunk_type.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_chunk_type_from_bytes` is never used
[INFO] [stdout]   --> src/chunk_type.rs:94:16
[INFO] [stdout]    |
[INFO] [stdout] 94 |         pub fn test_chunk_type_from_bytes() {
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_chunk_type_from_str` is never used
[INFO] [stdout]    --> src/chunk_type.rs:102:16
[INFO] [stdout]     |
[INFO] [stdout] 102 |         pub fn test_chunk_type_from_str() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_chunk_type_is_critical` is never used
[INFO] [stdout]    --> src/chunk_type.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 109 |         pub fn test_chunk_type_is_critical() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_chunk_type_is_not_critical` is never used
[INFO] [stdout]    --> src/chunk_type.rs:115:16
[INFO] [stdout]     |
[INFO] [stdout] 115 |         pub fn test_chunk_type_is_not_critical() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_chunk_type_is_public` is never used
[INFO] [stdout]    --> src/chunk_type.rs:121:16
[INFO] [stdout]     |
[INFO] [stdout] 121 |         pub fn test_chunk_type_is_public() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_chunk_type_is_not_public` is never used
[INFO] [stdout]    --> src/chunk_type.rs:127:16
[INFO] [stdout]     |
[INFO] [stdout] 127 |         pub fn test_chunk_type_is_not_public() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_chunk_type_is_reserved_bit_valid` is never used
[INFO] [stdout]    --> src/chunk_type.rs:133:16
[INFO] [stdout]     |
[INFO] [stdout] 133 |         pub fn test_chunk_type_is_reserved_bit_valid() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_chunk_type_is_reserved_bit_invalid` is never used
[INFO] [stdout]    --> src/chunk_type.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 139 |         pub fn test_chunk_type_is_reserved_bit_invalid() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_chunk_type_is_safe_to_copy` is never used
[INFO] [stdout]    --> src/chunk_type.rs:145:16
[INFO] [stdout]     |
[INFO] [stdout] 145 |         pub fn test_chunk_type_is_safe_to_copy() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_chunk_type_is_unsafe_to_copy` is never used
[INFO] [stdout]    --> src/chunk_type.rs:151:16
[INFO] [stdout]     |
[INFO] [stdout] 151 |         pub fn test_chunk_type_is_unsafe_to_copy() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_valid_chunk_is_valid` is never used
[INFO] [stdout]    --> src/chunk_type.rs:157:16
[INFO] [stdout]     |
[INFO] [stdout] 157 |         pub fn test_valid_chunk_is_valid() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_invalid_chunk_is_valid` is never used
[INFO] [stdout]    --> src/chunk_type.rs:163:16
[INFO] [stdout]     |
[INFO] [stdout] 163 |         pub fn test_invalid_chunk_is_valid() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_chunk_type_string` is never used
[INFO] [stdout]    --> src/chunk_type.rs:172:16
[INFO] [stdout]     |
[INFO] [stdout] 172 |         pub fn test_chunk_type_string() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_chunk_type_trait_impls` is never used
[INFO] [stdout]    --> src/chunk_type.rs:178:16
[INFO] [stdout]     |
[INFO] [stdout] 178 |         pub fn test_chunk_type_trait_impls() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `CHUNK_SIZE` is never used
[INFO] [stdout]   --> src/png.rs:13:7
[INFO] [stdout]    |
[INFO] [stdout] 13 | const CHUNK_SIZE: usize = 4;
[INFO] [stdout]    |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `u8_4_from_slice` is never used
[INFO] [stdout]   --> src/png.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn u8_4_from_slice(arr: &[u8]) -> [u8; CHUNK_SIZE] {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_file` is never used
[INFO] [stdout]   --> src/png.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl Png {
[INFO] [stdout]    | -------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn from_file<P: AsRef<Path>>(path: P) -> Result<Self> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/main.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     commands::run(args.command);
[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)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let _ = commands::run(args.command);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/png.rs:125:9
[INFO] [stdout]     |
[INFO] [stdout] 125 |         write!(f, "header: {:?}\nChunks:\n", Png::STANDARD_HEADER);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/png.rs:37:13
[INFO] [stdout]    |
[INFO] [stdout] 37 |         let mut file = fs::read(path)?;
[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/png.rs:111:13
[INFO] [stdout]     |
[INFO] [stdout] 111 |         let mut current = HEADER_SIZE;
[INFO] [stdout]     |             ----^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `data_as_string` is never used
[INFO] [stdout]   --> src/chunk.rs:73:12
[INFO] [stdout]    |
[INFO] [stdout] 33 | impl Chunk {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 73 |     pub fn data_as_string(&self) -> Result<String> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `is_critical`, `is_public`, `is_reserved_bit_valid`, `is_safe_to_copy`, `is_valid`, and `is_valid_byte` are never used
[INFO] [stdout]   --> src/chunk_type.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl ChunkType {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn is_critical(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     pub fn is_public(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn is_reserved_bit_valid(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 37 |     pub fn is_safe_to_copy(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 43 |     pub fn is_valid(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 48 |     pub fn is_valid_byte(byte: u8) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/chunk_type.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `CHUNK_SIZE` is never used
[INFO] [stdout]   --> src/png.rs:13:7
[INFO] [stdout]    |
[INFO] [stdout] 13 | const CHUNK_SIZE: usize = 4;
[INFO] [stdout]    |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `u8_4_from_slice` is never used
[INFO] [stdout]   --> src/png.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn u8_4_from_slice(arr: &[u8]) -> [u8; CHUNK_SIZE] {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `from_chunks` and `from_file` are never used
[INFO] [stdout]   --> src/png.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl Png {
[INFO] [stdout]    | -------- associated functions in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 31 |     pub fn from_chunks(chunks: Vec<Chunk>) -> Png {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn from_file<P: AsRef<Path>>(path: P) -> Result<Self> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/main.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     commands::run(args.command);
[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)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let _ = commands::run(args.command);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/png.rs:125:9
[INFO] [stdout]     |
[INFO] [stdout] 125 |         write!(f, "header: {:?}\nChunks:\n", Png::STANDARD_HEADER);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.81s
[INFO] running `Command { std: "docker" "inspect" "164204f9b425a15cd197dea11ff5dd2cfa0978855e6361b14e2df00f6124cd70", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "164204f9b425a15cd197dea11ff5dd2cfa0978855e6361b14e2df00f6124cd70", kill_on_drop: false }`
[INFO] [stdout] 164204f9b425a15cd197dea11ff5dd2cfa0978855e6361b14e2df00f6124cd70