[INFO] cloning repository https://github.com/k1ut3h/png
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/k1ut3h/png" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fk1ut3h%2Fpng", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fk1ut3h%2Fpng'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ad0494b23b481921404ca21f5f67f1befce3cf66
[INFO] testing k1ut3h/png against beta-2025-09-21 for beta-1.91-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fk1ut3h%2Fpng" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/k1ut3h/png
[INFO] finished tweaking git repo https://github.com/k1ut3h/png
[INFO] tweaked toml for git repo https://github.com/k1ut3h/png written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/k1ut3h/png on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/k1ut3h/png 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" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2fae500b3dc7ab3ae6e728218e64041b257d9f1d3f632988b72b304b25df340b
[INFO] running `Command { std: "docker" "start" "-a" "2fae500b3dc7ab3ae6e728218e64041b257d9f1d3f632988b72b304b25df340b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2fae500b3dc7ab3ae6e728218e64041b257d9f1d3f632988b72b304b25df340b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2fae500b3dc7ab3ae6e728218e64041b257d9f1d3f632988b72b304b25df340b", kill_on_drop: false }`
[INFO] [stdout] 2fae500b3dc7ab3ae6e728218e64041b257d9f1d3f632988b72b304b25df340b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 067b076a4137f83f82105300da9650877e38a7120880336669c37ebe204cc0e1
[INFO] running `Command { std: "docker" "start" "-a" "067b076a4137f83f82105300da9650877e38a7120880336669c37ebe204cc0e1", kill_on_drop: false }`
[INFO] [stderr]    Compiling crc32fast v1.3.2
[INFO] [stderr]    Compiling png v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated items `is_bit_zero`, `is_valid`, `is_critical`, `is_public`, `is_reserved_bit_valid`, and `is_safe_to_copy` are never used
[INFO] [stdout]   --> src/chunk_type.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl ChunkType{
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 11 |     pub fn is_bit_zero(byte: u8, i:u8)->bool{
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     pub fn is_valid(&self)->bool{
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     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] 30 |     pub fn is_reserved_bit_valid(&self)->bool{
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     pub fn is_safe_to_copy(&self)->bool{
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `length`, `chunk_type`, and `crc` are never read
[INFO] [stdout]  --> src/chunk.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Chunk{
[INFO] [stdout]   |            ----- fields in this struct
[INFO] [stdout] 6 |     length: u32,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 7 |     chunk_type: ChunkType,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 8 |     data: Vec<u8>,
[INFO] [stdout] 9 |     crc: u32
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `length`, `chunk_type`, `data`, `data_as_string`, and `crc` are never used
[INFO] [stdout]   --> src/chunk.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Chunk{
[INFO] [stdout]    | ---------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 18 |     pub fn length(&self)->u32{
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     pub fn chunk_type(&self)->&ChunkType{
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     pub fn data(&self)->&[u8]{
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |     fn data_as_string(&self) -> Result<String, FromUtf8Error>{
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     fn crc(&self)->u32{
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `append_chunk`, `remove_chunk`, `chunks`, and `chunk_by_type` are never used
[INFO] [stdout]   --> src/png.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout]  7 | impl Png{
[INFO] [stdout]    | -------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 13 |     pub fn append_chunk(&mut self, chunk: Chunk){
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     pub fn remove_chunk(&mut self, chunk_type: &str) -> Result<Chunk,&'static str>{
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     pub fn chunks(&self) -> &[Chunk]{
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |     pub fn chunk_by_type(&self, chunk_type: &str) -> Option<&Chunk>{
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.92s
[INFO] running `Command { std: "docker" "inspect" "067b076a4137f83f82105300da9650877e38a7120880336669c37ebe204cc0e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "067b076a4137f83f82105300da9650877e38a7120880336669c37ebe204cc0e1", kill_on_drop: false }`
[INFO] [stdout] 067b076a4137f83f82105300da9650877e38a7120880336669c37ebe204cc0e1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4bf0d00b2a361251748f358ae088020df4204736ffbdeab1de1cd86bb7f91a0f
[INFO] running `Command { std: "docker" "start" "-a" "4bf0d00b2a361251748f358ae088020df4204736ffbdeab1de1cd86bb7f91a0f", kill_on_drop: false }`
[INFO] [stderr]    Compiling png v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated items `is_bit_zero`, `is_valid`, `is_critical`, `is_public`, `is_reserved_bit_valid`, and `is_safe_to_copy` are never used
[INFO] [stdout]   --> src/chunk_type.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl ChunkType{
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 11 |     pub fn is_bit_zero(byte: u8, i:u8)->bool{
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     pub fn is_valid(&self)->bool{
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     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] 30 |     pub fn is_reserved_bit_valid(&self)->bool{
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     pub fn is_safe_to_copy(&self)->bool{
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `length`, `chunk_type`, and `crc` are never read
[INFO] [stdout]  --> src/chunk.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Chunk{
[INFO] [stdout]   |            ----- fields in this struct
[INFO] [stdout] 6 |     length: u32,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 7 |     chunk_type: ChunkType,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 8 |     data: Vec<u8>,
[INFO] [stdout] 9 |     crc: u32
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `length`, `chunk_type`, `data`, `data_as_string`, and `crc` are never used
[INFO] [stdout]   --> src/chunk.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Chunk{
[INFO] [stdout]    | ---------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 18 |     pub fn length(&self)->u32{
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     pub fn chunk_type(&self)->&ChunkType{
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     pub fn data(&self)->&[u8]{
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |     fn data_as_string(&self) -> Result<String, FromUtf8Error>{
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     fn crc(&self)->u32{
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `append_chunk`, `remove_chunk`, `chunks`, and `chunk_by_type` are never used
[INFO] [stdout]   --> src/png.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout]  7 | impl Png{
[INFO] [stdout]    | -------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 13 |     pub fn append_chunk(&mut self, chunk: Chunk){
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     pub fn remove_chunk(&mut self, chunk_type: &str) -> Result<Chunk,&'static str>{
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     pub fn chunks(&self) -> &[Chunk]{
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |     pub fn chunk_by_type(&self, chunk_type: &str) -> Option<&Chunk>{
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.28s
[INFO] running `Command { std: "docker" "inspect" "4bf0d00b2a361251748f358ae088020df4204736ffbdeab1de1cd86bb7f91a0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4bf0d00b2a361251748f358ae088020df4204736ffbdeab1de1cd86bb7f91a0f", kill_on_drop: false }`
[INFO] [stdout] 4bf0d00b2a361251748f358ae088020df4204736ffbdeab1de1cd86bb7f91a0f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 2506c2ff67f4c05571ac602de2fc289030859ac9af27ec2b950d107204cbf063
[INFO] running `Command { std: "docker" "start" "-a" "2506c2ff67f4c05571ac602de2fc289030859ac9af27ec2b950d107204cbf063", kill_on_drop: false }`
[INFO] [stderr] warning: associated items `is_bit_zero`, `is_valid`, `is_critical`, `is_public`, `is_reserved_bit_valid`, and `is_safe_to_copy` are never used
[INFO] [stderr]   --> src/chunk_type.rs:11:12
[INFO] [stderr]    |
[INFO] [stderr] 10 | impl ChunkType{
[INFO] [stderr]    | -------------- associated items in this implementation
[INFO] [stderr] 11 |     pub fn is_bit_zero(byte: u8, i:u8)->bool{
[INFO] [stderr]    |            ^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 21 |     pub fn is_valid(&self)->bool{
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 24 |     pub fn is_critical(&self)->bool{
[INFO] [stderr]    |            ^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 27 |     pub fn is_public(&self)->bool{
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 30 |     pub fn is_reserved_bit_valid(&self)->bool{
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 33 |     pub fn is_safe_to_copy(&self)->bool{
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: fields `length`, `chunk_type`, and `crc` are never read
[INFO] [stderr]  --> src/chunk.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub struct Chunk{
[INFO] [stderr]   |            ----- fields in this struct
[INFO] [stderr] 6 |     length: u32,
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr] 7 |     chunk_type: ChunkType,
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 8 |     data: Vec<u8>,
[INFO] [stderr] 9 |     crc: u32
[INFO] [stderr]   |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: methods `length`, `chunk_type`, `data`, `data_as_string`, and `crc` are never used
[INFO] [stderr]   --> src/chunk.rs:18:12
[INFO] [stderr]    |
[INFO] [stderr] 12 | impl Chunk{
[INFO] [stderr]    | ---------- methods in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 18 |     pub fn length(&self)->u32{
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 21 |     pub fn chunk_type(&self)->&ChunkType{
[INFO] [stderr]    |            ^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 24 |     pub fn data(&self)->&[u8]{
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] ...
[INFO] [stderr] 30 |     fn data_as_string(&self) -> Result<String, FromUtf8Error>{
[INFO] [stderr]    |        ^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 33 |     fn crc(&self)->u32{
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: methods `append_chunk`, `remove_chunk`, `chunks`, and `chunk_by_type` are never used
[INFO] [stderr]   --> src/png.rs:13:12
[INFO] [stderr]    |
[INFO] [stderr]  7 | impl Png{
[INFO] [stderr]    | -------- methods in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 13 |     pub fn append_chunk(&mut self, chunk: Chunk){
[INFO] [stderr]    |            ^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 16 |     pub fn remove_chunk(&mut self, chunk_type: &str) -> Result<Chunk,&'static str>{
[INFO] [stderr]    |            ^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 27 |     pub fn chunks(&self) -> &[Chunk]{
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 30 |     pub fn chunk_by_type(&self, chunk_type: &str) -> Option<&Chunk>{
[INFO] [stderr]    |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `png` (bin "png" test) generated 4 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/png-c3de5bc9c4f74030)
[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" "2506c2ff67f4c05571ac602de2fc289030859ac9af27ec2b950d107204cbf063", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2506c2ff67f4c05571ac602de2fc289030859ac9af27ec2b950d107204cbf063", kill_on_drop: false }`
[INFO] [stdout] 2506c2ff67f4c05571ac602de2fc289030859ac9af27ec2b950d107204cbf063
