[INFO] cloning repository https://github.com/CHB2025/png
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CHB2025/png" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCHB2025%2Fpng", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCHB2025%2Fpng'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0d6ecd07f25c23008fe4c040624a32d680e2b717
[INFO] building CHB2025/png against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCHB2025%2Fpng" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/CHB2025/png on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/CHB2025/png
[INFO] finished tweaking git repo https://github.com/CHB2025/png
[INFO] tweaked toml for git repo https://github.com/CHB2025/png written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/CHB2025/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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a65fa2b36c565c126259d3a1b776b481ceab830211912f520354957ce35be3c1
[INFO] running `Command { std: "docker" "start" "-a" "a65fa2b36c565c126259d3a1b776b481ceab830211912f520354957ce35be3c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a65fa2b36c565c126259d3a1b776b481ceab830211912f520354957ce35be3c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a65fa2b36c565c126259d3a1b776b481ceab830211912f520354957ce35be3c1", kill_on_drop: false }`
[INFO] [stdout] a65fa2b36c565c126259d3a1b776b481ceab830211912f520354957ce35be3c1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 68dc7ec68e681404becd35cfe5a327cb01c4974f1491e60234a526ea033e55e6
[INFO] running `Command { std: "docker" "start" "-a" "68dc7ec68e681404becd35cfe5a327cb01c4974f1491e60234a526ea033e55e6", kill_on_drop: false }`
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling adler2 v2.0.0
[INFO] [stderr]    Compiling crc32fast v1.4.2
[INFO] [stderr]    Compiling miniz_oxide v0.8.0
[INFO] [stderr]    Compiling flate2 v1.0.35
[INFO] [stderr]    Compiling png v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `DeflateDecoder`
[INFO] [stdout]  --> src/parser.rs:3:20
[INFO] [stdout]   |
[INFO] [stdout] 3 | use flate2::read::{DeflateDecoder, ZlibDecoder};
[INFO] [stdout]   |                    ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `PNG_SIG` is never used
[INFO] [stdout]   --> src/intermediate.rs:16:7
[INFO] [stdout]    |
[INFO] [stdout] 16 | const PNG_SIG: [u8; 8] = [137, 80, 78, 71, 13, 10, 26, 10];
[INFO] [stdout]    |       ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_chunks` is never used
[INFO] [stdout]   --> src/intermediate.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn read_chunks(mut reader: impl Read) -> io::Result<Vec<Chunk>> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/intermediate/chunk.rs:17:18
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Chunk {
[INFO] [stdout]    | ---------- associated function in this implementation
[INFO] [stdout] 17 |     pub const fn new(kind: ChunkKind, data: Box<[u8]>) -> Self {
[INFO] [stdout]    |                  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `PLTE` is never used
[INFO] [stdout]  --> src/intermediate/chunk_kind.rs:2:11
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub const PLTE: ChunkKind = ChunkKind(*b"PLTE");
[INFO] [stdout]   |           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `public` and `copy_safe` are never used
[INFO] [stdout]   --> src/intermediate/chunk_kind.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl ChunkKind {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 34 |     pub fn public(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 46 |     pub fn copy_safe(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `is_done` is never used
[INFO] [stdout]   --> src/intermediate/chunk_reader.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl<R> ChunkReader<R> {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] 20 |     pub fn is_done(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `filter` and `compression_method` are never read
[INFO] [stdout]   --> src/parser.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub struct PngParser<R> {
[INFO] [stdout]    |            --------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 31 |     filter: Filter,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 32 |     compression_method: u8,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Color` is never used
[INFO] [stdout]    --> src/lib.rs:101:15
[INFO] [stdout]     |
[INFO] [stdout] 101 |     pub trait Color {
[INFO] [stdout]     |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Png` is never constructed
[INFO] [stdout]    --> src/lib.rs:116:16
[INFO] [stdout]     |
[INFO] [stdout] 116 |     pub struct Png<C: Color> {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Png` is never constructed
[INFO] [stdout]    --> src/lib.rs:135:16
[INFO] [stdout]     |
[INFO] [stdout] 135 |     pub struct Png {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]    --> src/lib.rs:151:16
[INFO] [stdout]     |
[INFO] [stdout] 151 |     pub struct Color {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Png` is never constructed
[INFO] [stdout]    --> src/lib.rs:156:16
[INFO] [stdout]     |
[INFO] [stdout] 156 |     pub struct Png {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Color` is never used
[INFO] [stdout]    --> src/lib.rs:164:14
[INFO] [stdout]     |
[INFO] [stdout] 164 |     pub enum Color {
[INFO] [stdout]     |              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Png` is never constructed
[INFO] [stdout]    --> src/lib.rs:168:16
[INFO] [stdout]     |
[INFO] [stdout] 168 |     pub struct Png {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]    --> src/lib.rs:177:16
[INFO] [stdout]     |
[INFO] [stdout] 177 |     pub struct Color(u16, u16, u16);
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Png` is never constructed
[INFO] [stdout]    --> src/lib.rs:178:16
[INFO] [stdout]     |
[INFO] [stdout] 178 |     pub struct Png {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.82s
[INFO] running `Command { std: "docker" "inspect" "68dc7ec68e681404becd35cfe5a327cb01c4974f1491e60234a526ea033e55e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "68dc7ec68e681404becd35cfe5a327cb01c4974f1491e60234a526ea033e55e6", kill_on_drop: false }`
[INFO] [stdout] 68dc7ec68e681404becd35cfe5a327cb01c4974f1491e60234a526ea033e55e6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 647c70e8678c30204a50eba5195c8d1959fe7a78b2098810eb390d61f8887136
[INFO] running `Command { std: "docker" "start" "-a" "647c70e8678c30204a50eba5195c8d1959fe7a78b2098810eb390d61f8887136", kill_on_drop: false }`
[INFO] [stdout] warning: unused import: `DeflateDecoder`
[INFO] [stdout]  --> src/parser.rs:3:20
[INFO] [stdout]   |
[INFO] [stdout] 3 | use flate2::read::{DeflateDecoder, ZlibDecoder};
[INFO] [stdout]   |                    ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `PNG_SIG` is never used
[INFO] [stdout]   --> src/intermediate.rs:16:7
[INFO] [stdout]    |
[INFO] [stdout] 16 | const PNG_SIG: [u8; 8] = [137, 80, 78, 71, 13, 10, 26, 10];
[INFO] [stdout]    |       ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_chunks` is never used
[INFO] [stdout]   --> src/intermediate.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn read_chunks(mut reader: impl Read) -> io::Result<Vec<Chunk>> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/intermediate/chunk.rs:17:18
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Chunk {
[INFO] [stdout]    | ---------- associated function in this implementation
[INFO] [stdout] 17 |     pub const fn new(kind: ChunkKind, data: Box<[u8]>) -> Self {
[INFO] [stdout]    |                  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `PLTE` is never used
[INFO] [stdout]  --> src/intermediate/chunk_kind.rs:2:11
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub const PLTE: ChunkKind = ChunkKind(*b"PLTE");
[INFO] [stdout]   |           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `public` and `copy_safe` are never used
[INFO] [stdout]   --> src/intermediate/chunk_kind.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl ChunkKind {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 34 |     pub fn public(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 46 |     pub fn copy_safe(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `is_done` is never used
[INFO] [stdout]   --> src/intermediate/chunk_reader.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl<R> ChunkReader<R> {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] 20 |     pub fn is_done(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `filter` and `compression_method` are never read
[INFO] [stdout]   --> src/parser.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub struct PngParser<R> {
[INFO] [stdout]    |            --------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 31 |     filter: Filter,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 32 |     compression_method: u8,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Color` is never used
[INFO] [stdout]    --> src/lib.rs:101:15
[INFO] [stdout]     |
[INFO] [stdout] 101 |     pub trait Color {
[INFO] [stdout]     |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Png` is never constructed
[INFO] [stdout]    --> src/lib.rs:116:16
[INFO] [stdout]     |
[INFO] [stdout] 116 |     pub struct Png<C: Color> {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Png` is never constructed
[INFO] [stdout]    --> src/lib.rs:135:16
[INFO] [stdout]     |
[INFO] [stdout] 135 |     pub struct Png {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]    --> src/lib.rs:151:16
[INFO] [stdout]     |
[INFO] [stdout] 151 |     pub struct Color {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Png` is never constructed
[INFO] [stdout]    --> src/lib.rs:156:16
[INFO] [stdout]     |
[INFO] [stdout] 156 |     pub struct Png {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Color` is never used
[INFO] [stdout]    --> src/lib.rs:164:14
[INFO] [stdout]     |
[INFO] [stdout] 164 |     pub enum Color {
[INFO] [stdout]     |              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Png` is never constructed
[INFO] [stdout]    --> src/lib.rs:168:16
[INFO] [stdout]     |
[INFO] [stdout] 168 |     pub struct Png {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]    --> src/lib.rs:177:16
[INFO] [stdout]     |
[INFO] [stdout] 177 |     pub struct Color(u16, u16, u16);
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling png v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `Png` is never constructed
[INFO] [stdout]    --> src/lib.rs:178:16
[INFO] [stdout]     |
[INFO] [stdout] 178 |     pub struct Png {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `DeflateDecoder`
[INFO] [stdout]  --> src/parser.rs:3:20
[INFO] [stdout]   |
[INFO] [stdout] 3 | use flate2::read::{DeflateDecoder, ZlibDecoder};
[INFO] [stdout]   |                    ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `is_done` is never used
[INFO] [stdout]   --> src/intermediate/chunk_reader.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl<R> ChunkReader<R> {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] 20 |     pub fn is_done(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `filter` and `compression_method` are never read
[INFO] [stdout]   --> src/parser.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub struct PngParser<R> {
[INFO] [stdout]    |            --------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 31 |     filter: Filter,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 32 |     compression_method: u8,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Color` is never used
[INFO] [stdout]    --> src/lib.rs:101:15
[INFO] [stdout]     |
[INFO] [stdout] 101 |     pub trait Color {
[INFO] [stdout]     |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Png` is never constructed
[INFO] [stdout]    --> src/lib.rs:116:16
[INFO] [stdout]     |
[INFO] [stdout] 116 |     pub struct Png<C: Color> {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Png` is never constructed
[INFO] [stdout]    --> src/lib.rs:135:16
[INFO] [stdout]     |
[INFO] [stdout] 135 |     pub struct Png {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]    --> src/lib.rs:151:16
[INFO] [stdout]     |
[INFO] [stdout] 151 |     pub struct Color {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Png` is never constructed
[INFO] [stdout]    --> src/lib.rs:156:16
[INFO] [stdout]     |
[INFO] [stdout] 156 |     pub struct Png {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Color` is never used
[INFO] [stdout]    --> src/lib.rs:164:14
[INFO] [stdout]     |
[INFO] [stdout] 164 |     pub enum Color {
[INFO] [stdout]     |              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Png` is never constructed
[INFO] [stdout]    --> src/lib.rs:168:16
[INFO] [stdout]     |
[INFO] [stdout] 168 |     pub struct Png {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]    --> src/lib.rs:177:16
[INFO] [stdout]     |
[INFO] [stdout] 177 |     pub struct Color(u16, u16, u16);
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Png` is never constructed
[INFO] [stdout]    --> src/lib.rs:178:16
[INFO] [stdout]     |
[INFO] [stdout] 178 |     pub struct Png {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.31s
[INFO] running `Command { std: "docker" "inspect" "647c70e8678c30204a50eba5195c8d1959fe7a78b2098810eb390d61f8887136", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "647c70e8678c30204a50eba5195c8d1959fe7a78b2098810eb390d61f8887136", kill_on_drop: false }`
[INFO] [stdout] 647c70e8678c30204a50eba5195c8d1959fe7a78b2098810eb390d61f8887136