[INFO] cloning repository https://github.com/nkaush/png-decorder-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nkaush/png-decorder-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnkaush%2Fpng-decorder-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnkaush%2Fpng-decorder-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 220a94904e3ec659f08d03ab8a5550e76a842933
[INFO] testing nkaush/png-decorder-rs against beta-2026-01-20 for beta-1.94-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnkaush%2Fpng-decorder-rs" "/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/nkaush/png-decorder-rs
[INFO] finished tweaking git repo https://github.com/nkaush/png-decorder-rs
[INFO] tweaked toml for git repo https://github.com/nkaush/png-decorder-rs written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/nkaush/png-decorder-rs on toolchain beta-2026-01-20
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-01-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/nkaush/png-decorder-rs 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-2026-01-20" "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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-01-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0493d48445318731c246ad3f61e1f7a57dec311f24114a67453d799096441a25
[INFO] running `Command { std: "docker" "start" "-a" "0493d48445318731c246ad3f61e1f7a57dec311f24114a67453d799096441a25", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0493d48445318731c246ad3f61e1f7a57dec311f24114a67453d799096441a25", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0493d48445318731c246ad3f61e1f7a57dec311f24114a67453d799096441a25", kill_on_drop: false }`
[INFO] [stdout] 0493d48445318731c246ad3f61e1f7a57dec311f24114a67453d799096441a25
[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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-01-20" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 889c1fae3b656e84232fe6224aecbef0f11192e70a096d788af48f9bc4221831
[INFO] running `Command { std: "docker" "start" "-a" "889c1fae3b656e84232fe6224aecbef0f11192e70a096d788af48f9bc4221831", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.85
[INFO] [stderr]    Compiling libc v0.2.112
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]    Compiling termcolor v1.1.2
[INFO] [stderr]    Compiling crc-catalog v1.1.1
[INFO] [stderr]    Compiling indexmap v1.8.0
[INFO] [stderr]    Compiling textwrap v0.14.2
[INFO] [stderr]    Compiling crc v2.1.0
[INFO] [stderr]    Compiling os_str_bytes v6.0.0
[INFO] [stderr]    Compiling quote v1.0.14
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling clap_derive v3.0.5
[INFO] [stderr]    Compiling clap v3.0.5
[INFO] [stderr]    Compiling png v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::convert::TryFrom`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::convert::TryFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `png::chunk_specs::IHDR`
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use png::chunk_specs::IHDR;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `from_chunks`, `header`, and `chunk_by_type` are never used
[INFO] [stdout]   --> src/png/mod.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl Png {
[INFO] [stdout]    | -------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 25 |     pub fn from_chunks(chunks: Vec<Chunk>) -> Png {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 70 |     pub fn header(&self) -> &[u8; 8] {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 81 |     pub fn chunk_by_type(&self, chunk_type: &str) -> Option<&Chunk> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `is_valid`, `is_public`, `is_reserved_bit_valid`, and `is_safe_to_copy` are never used
[INFO] [stdout]   --> src/png/chunk_type.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl ChunkType {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 23 |     pub fn is_valid(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 39 |     pub fn is_public(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 44 |     pub fn is_reserved_bit_valid(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |     pub fn is_safe_to_copy(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IHDR` is never constructed
[INFO] [stdout]  --> src/png/chunk_specs/ihdr.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct IHDR {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]   --> src/png/chunk_specs/ihdr.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl IHDR {
[INFO] [stdout]    | --------- methods in this implementation
[INFO] [stdout] 17 |     fn width(&self) -> u32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     fn height(&self) -> u32 {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25 |     fn bit_depth(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |     fn color_type(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     fn compression_method(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 37 |     fn filter_method(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 41 |     fn interlace_method(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/png/mod.rs:148:13
[INFO] [stdout]     |
[INFO] [stdout] 148 |             writeln!(f, "{}", chunk);
[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] 148 |             let _ = writeln!(f, "{}", chunk);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.85s
[INFO] running `Command { std: "docker" "inspect" "889c1fae3b656e84232fe6224aecbef0f11192e70a096d788af48f9bc4221831", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "889c1fae3b656e84232fe6224aecbef0f11192e70a096d788af48f9bc4221831", kill_on_drop: false }`
[INFO] [stdout] 889c1fae3b656e84232fe6224aecbef0f11192e70a096d788af48f9bc4221831
[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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-01-20" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c4aa7b778b29668e4197c89f7e1ea7171b1089102ca181f3640b6d753ae40cef
[INFO] running `Command { std: "docker" "start" "-a" "c4aa7b778b29668e4197c89f7e1ea7171b1089102ca181f3640b6d753ae40cef", kill_on_drop: false }`
[INFO] [stderr]    Compiling png v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::convert::TryFrom`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::convert::TryFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `png::chunk_specs::IHDR`
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use png::chunk_specs::IHDR;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `header` is never used
[INFO] [stdout]   --> src/png/mod.rs:70:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl Png {
[INFO] [stdout]    | -------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 70 |     pub fn header(&self) -> &[u8; 8] {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IHDR` is never constructed
[INFO] [stdout]  --> src/png/chunk_specs/ihdr.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct IHDR {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]   --> src/png/chunk_specs/ihdr.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl IHDR {
[INFO] [stdout]    | --------- methods in this implementation
[INFO] [stdout] 17 |     fn width(&self) -> u32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     fn height(&self) -> u32 {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25 |     fn bit_depth(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |     fn color_type(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     fn compression_method(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 37 |     fn filter_method(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 41 |     fn interlace_method(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/png/mod.rs:148:13
[INFO] [stdout]     |
[INFO] [stdout] 148 |             writeln!(f, "{}", chunk);
[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] 148 |             let _ = writeln!(f, "{}", chunk);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.04s
[INFO] running `Command { std: "docker" "inspect" "c4aa7b778b29668e4197c89f7e1ea7171b1089102ca181f3640b6d753ae40cef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c4aa7b778b29668e4197c89f7e1ea7171b1089102ca181f3640b6d753ae40cef", kill_on_drop: false }`
[INFO] [stdout] c4aa7b778b29668e4197c89f7e1ea7171b1089102ca181f3640b6d753ae40cef
[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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-01-20" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 264247cb3d18f54f19e00ef032a8c75d454f024476df2b6a5408079a866644b9
[INFO] running `Command { std: "docker" "start" "-a" "264247cb3d18f54f19e00ef032a8c75d454f024476df2b6a5408079a866644b9", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::convert::TryFrom`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::convert::TryFrom;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `png::chunk_specs::IHDR`
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use png::chunk_specs::IHDR;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `header` is never used
[INFO] [stderr]   --> src/png/mod.rs:70:12
[INFO] [stderr]    |
[INFO] [stderr] 19 | impl Png {
[INFO] [stderr]    | -------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 70 |     pub fn header(&self) -> &[u8; 8] {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct `IHDR` is never constructed
[INFO] [stderr]  --> src/png/chunk_specs/ihdr.rs:6:12
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct IHDR {
[INFO] [stderr]   |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: multiple methods are never used
[INFO] [stderr]   --> src/png/chunk_specs/ihdr.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 16 | impl IHDR {
[INFO] [stderr]    | --------- methods in this implementation
[INFO] [stderr] 17 |     fn width(&self) -> u32 {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 21 |     fn height(&self) -> u32 {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 25 |     fn bit_depth(&self) -> u8 {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 29 |     fn color_type(&self) -> u8 {
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 33 |     fn compression_method(&self) -> u8 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 37 |     fn filter_method(&self) -> u8 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 41 |     fn interlace_method(&self) -> u8 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/png/mod.rs:148:13
[INFO] [stderr]     |
[INFO] [stderr] 148 |             writeln!(f, "{}", chunk);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 148 |             let _ = writeln!(f, "{}", chunk);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `png` (bin "png" test) generated 6 warnings (run `cargo fix --bin "png" -p png --tests` to apply 2 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/png-0dc162625d31cf5d)
[INFO] [stdout] 
[INFO] [stdout] running 32 tests
[INFO] [stdout] test png::chunk::tests::test_chunk_crc ... ok
[INFO] [stdout] test png::chunk::tests::test_chunk_type ... ok
[INFO] [stdout] test png::chunk::tests::test_valid_chunk_from_bytes ... ok
[INFO] [stdout] test png::chunk_type::tests::test_chunk_type_from_str ... ok
[INFO] [stdout] test png::chunk::tests::test_invalid_chunk_from_bytes ... ok
[INFO] [stdout] test png::chunk::tests::test_chunk_trait_impls ... ok
[INFO] [stdout] test png::chunk_type::tests::test_chunk_type_from_bytes ... ok
[INFO] [stdout] test png::chunk_type::tests::test_chunk_type_is_critical ... ok
[INFO] [stdout] test png::chunk::tests::test_chunk_string ... ok
[INFO] [stdout] test png::chunk_type::tests::test_chunk_type_is_not_critical ... ok
[INFO] [stdout] test png::chunk_type::tests::test_chunk_type_is_not_public ... ok
[INFO] [stdout] test png::chunk_type::tests::test_chunk_type_is_public ... ok
[INFO] [stdout] test png::chunk_type::tests::test_chunk_type_is_reserved_bit_valid ... ok
[INFO] [stdout] test png::chunk_type::tests::test_chunk_type_is_safe_to_copy ... ok
[INFO] [stdout] test png::chunk_type::tests::test_chunk_type_is_unsafe_to_copy ... ok
[INFO] [stdout] test png::chunk_type::tests::test_chunk_type_string ... ok
[INFO] [stdout] test png::chunk_type::tests::test_chunk_type_trait_impls ... ok
[INFO] [stdout] test png::chunk_type::tests::test_invalid_chunk_is_valid ... ok
[INFO] [stdout] test png::tests::test_chunk_by_type ... ok
[INFO] [stdout] test png::tests::test_invalid_header ... ok
[INFO] [stdout] test png::tests::test_append_chunk ... ok
[INFO] [stdout] test png::tests::test_list_chunks ... ok
[INFO] [stdout] test png::tests::test_png_trait_impls ... ok
[INFO] [stdout] test png::tests::test_as_bytes ... ok
[INFO] [stdout] test png::tests::test_png_from_image_file ... ok
[INFO] [stdout] test png::tests::test_invalid_chunk ... ok
[INFO] [stdout] test png::tests::test_remove_chunk ... ok
[INFO] [stdout] test png::tests::test_valid_from_bytes ... ok
[INFO] [stdout] test png::tests::test_from_chunks ... ok
[INFO] [stdout] test png::chunk_type::tests::test_chunk_type_is_reserved_bit_invalid ... ok
[INFO] [stdout] test png::chunk::tests::test_chunk_length ... ok
[INFO] [stdout] test png::chunk_type::tests::test_valid_chunk_is_valid ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- png::chunk_type::tests::test_valid_chunk_is_valid stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'png::chunk_type::tests::test_valid_chunk_is_valid' (44) panicked at src/png/chunk_type.rs:175:9:
[INFO] [stdout] assertion failed: chunk.is_valid()
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x57cf3db29dc2 - std::backtrace_rs::backtrace::libunwind::trace::hf0bd46b30bc61685
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x57cf3db29dc2 - std::backtrace_rs::backtrace::trace_unsynchronized::h1d1fbb72ad89d7b7
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x57cf3db29dc2 - std::sys::backtrace::_print_fmt::he38b6f68ca847f47
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/sys/backtrace.rs:74:9
[INFO] [stdout]    3:     0x57cf3db29dc2 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hb7e843cde1bc81a3
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/sys/backtrace.rs:44:26
[INFO] [stdout]    4:     0x57cf3db3a09a - core::fmt::rt::Argument::fmt::hc1dd77ac64f2688c
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x57cf3db3a09a - core::fmt::write::h952c506e2dbe9cff
[INFO] [stdout]    6:     0x57cf3daf8d46 - std::io::default_write_fmt::hd23bd8145c03a23a
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x57cf3daf8d46 - std::io::Write::write_fmt::hdd3314a2bd8a34bd
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/io/mod.rs:1994:13
[INFO] [stdout]    8:     0x57cf3db092a9 - std::sys::backtrace::BacktraceLock::print::h1079b82381c2c252
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/sys/backtrace.rs:47:9
[INFO] [stdout]    9:     0x57cf3db092a9 - std::panicking::default_hook::{{closure}}::h85cb76b8462c00f2
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x57cf3db09141 - std::panicking::default_hook::h0134d220cc034c02
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/panicking.rs:316:9
[INFO] [stdout]   11:     0x57cf3dacb18e - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hb2e68dca3970e3ca
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   12:     0x57cf3dacb18e - test::test_main_with_exit_callback::{{closure}}::ha7ec2063a2565ec3
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x57cf3db09522 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::haebee478d0f56cf4
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   14:     0x57cf3db09522 - std::panicking::panic_with_hook::h8119b6db1fef734f
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/panicking.rs:833:13
[INFO] [stdout]   15:     0x57cf3db0939a - std::panicking::panic_handler::{{closure}}::h24f5360b91482c0e
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/panicking.rs:691:13
[INFO] [stdout]   16:     0x57cf3db048f9 - std::sys::backtrace::__rust_end_short_backtrace::h4e60c5cbd1bd0108
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/sys/backtrace.rs:182:18
[INFO] [stdout]   17:     0x57cf3daed93d - __rustc[e4c6931bd8050421]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/panicking.rs:689:5
[INFO] [stdout]   18:     0x57cf3db4147c - core::panicking::panic_fmt::hb1614a3ff6840071
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/core/src/panicking.rs:80:14
[INFO] [stdout]   19:     0x57cf3db41442 - core::panicking::panic::h6519d2e94a76dd19
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/core/src/panicking.rs:150:5
[INFO] [stdout]   20:     0x57cf3da9ab89 - png::png::chunk_type::tests::test_valid_chunk_is_valid::hfec6fc6a8775ce1c
[INFO] [stdout]                                at /opt/rustwide/workdir/src/png/chunk_type.rs:175:9
[INFO] [stdout]   21:     0x57cf3da9aba7 - png::png::chunk_type::tests::test_valid_chunk_is_valid::{{closure}}::h3e948b0dfdf50810
[INFO] [stdout]                                at /opt/rustwide/workdir/src/png/chunk_type.rs:173:39
[INFO] [stdout]   22:     0x57cf3da9c036 - core::ops::function::FnOnce::call_once::h951f2cdfce2014fb
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   23:     0x57cf3dacaf8b - core::ops::function::FnOnce::call_once::hefaf63600cd43d2a
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x57cf3dacaf8b - test::__rust_begin_short_backtrace::he30322a73a0e9ea6
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/test/src/lib.rs:663:18
[INFO] [stdout]   25:     0x57cf3dade95a - test::run_test_in_process::{{closure}}::hdea3ab8d0243ef36
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/test/src/lib.rs:686:74
[INFO] [stdout]   26:     0x57cf3dade95a - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h66d192f42498ffce
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   27:     0x57cf3dade95a - std::panicking::catch_unwind::do_call::h822e18e8d3a6bb65
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/panicking.rs:581:40
[INFO] [stdout]   28:     0x57cf3dade95a - std::panicking::catch_unwind::h54b1de7ceab578bf
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/panicking.rs:544:19
[INFO] [stdout]   29:     0x57cf3dade95a - std::panic::catch_unwind::h60c29b7a9d0246b1
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/panic.rs:359:14
[INFO] [stdout]   30:     0x57cf3dade95a - test::run_test_in_process::h6099b5f871379b13
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/test/src/lib.rs:686:27
[INFO] [stdout]   31:     0x57cf3dade95a - test::run_test::{{closure}}::h926ce0a38281a4c8
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/test/src/lib.rs:607:43
[INFO] [stdout]   32:     0x57cf3dab8db4 - test::run_test::{{closure}}::h508de21a9afc7140
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/test/src/lib.rs:637:41
[INFO] [stdout]   33:     0x57cf3dab8db4 - std::sys::backtrace::__rust_begin_short_backtrace::h6e2f5c39ca00735a
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/sys/backtrace.rs:166:18
[INFO] [stdout]   34:     0x57cf3dabc672 - std::thread::lifecycle::spawn_unchecked::{{closure}}::{{closure}}::h133e44f0e5802c14
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/thread/lifecycle.rs:91:13
[INFO] [stdout]   35:     0x57cf3dabc672 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h4718c1285283955c
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   36:     0x57cf3dabc672 - std::panicking::catch_unwind::do_call::h0bba3937b4892238
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/panicking.rs:581:40
[INFO] [stdout]   37:     0x57cf3dabc672 - std::panicking::catch_unwind::h5b31cab5fb8c5d7f
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/panicking.rs:544:19
[INFO] [stdout]   38:     0x57cf3dabc672 - std::panic::catch_unwind::hb2fa05d52ed0124e
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/panic.rs:359:14
[INFO] [stdout]   39:     0x57cf3dabc672 - std::thread::lifecycle::spawn_unchecked::{{closure}}::hf401cf5ff501bd29
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/thread/lifecycle.rs:89:26
[INFO] [stdout]   40:     0x57cf3dabc672 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h160022e94ce3b0bb
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   41:     0x57cf3daffb8f - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hf234e0d1d1d272ba
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/alloc/src/boxed.rs:2206:9
[INFO] [stdout]   42:     0x57cf3daffb8f - std::sys::thread::unix::Thread::new::thread_start::h106a295241840d3b
[INFO] [stdout]                                at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/sys/thread/unix.rs:127:17
[INFO] [stdout]   43:     0x7882b9a83aa4 - <unknown>
[INFO] [stdout]   44:     0x7882b9b10a64 - clone
[INFO] [stdout]   45:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     png::chunk_type::tests::test_valid_chunk_is_valid
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 31 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.31s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass `--bin png`
[INFO] running `Command { std: "docker" "inspect" "264247cb3d18f54f19e00ef032a8c75d454f024476df2b6a5408079a866644b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "264247cb3d18f54f19e00ef032a8c75d454f024476df2b6a5408079a866644b9", kill_on_drop: false }`
[INFO] [stdout] 264247cb3d18f54f19e00ef032a8c75d454f024476df2b6a5408079a866644b9
