[INFO] cloning repository https://github.com/wpovell/img-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wpovell/img-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwpovell%2Fimg-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwpovell%2Fimg-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 88f0e2751199b6496e26e9fc0f6541017533bb81
[INFO] testing wpovell/img-rs against try#03a1ea71b075ab964b5278bc6e74cd6c52c36ee0 for pr-74409
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwpovell%2Fimg-rs" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wpovell/img-rs on toolchain 03a1ea71b075ab964b5278bc6e74cd6c52c36ee0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/wpovell/img-rs
[INFO] finished tweaking git repo https://github.com/wpovell/img-rs
[INFO] tweaked toml for git repo https://github.com/wpovell/img-rs written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/wpovell/img-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1610ef7344a3684a180d7dadd3762bbe72e7ec873aa030c5fcd88cd36a78856a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1610ef7344a3684a180d7dadd3762bbe72e7ec873aa030c5fcd88cd36a78856a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1610ef7344a3684a180d7dadd3762bbe72e7ec873aa030c5fcd88cd36a78856a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1610ef7344a3684a180d7dadd3762bbe72e7ec873aa030c5fcd88cd36a78856a", kill_on_drop: false }`
[INFO] [stdout] 1610ef7344a3684a180d7dadd3762bbe72e7ec873aa030c5fcd88cd36a78856a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 5d44aaecf49be99adfe3e3e0469f22a68a0a6ed193974597502250d56f1bc29e
[INFO] running `Command { std: "docker" "start" "-a" "5d44aaecf49be99adfe3e3e0469f22a68a0a6ed193974597502250d56f1bc29e", kill_on_drop: false }`
[INFO] [stderr]    Compiling byteorder v1.2.7
[INFO] [stderr]    Compiling img v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]   --> src/png/crc.rs:27:17
[INFO] [stdout]    |
[INFO] [stdout] 27 |                 (v >> 1)
[INFO] [stdout]    |                 ^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/png/chunk/ihdr.rs:11:45
[INFO] [stdout]    |
[INFO] [stdout] 11 | type Result<T> = std::result::Result<T, Box<error::Error>>;
[INFO] [stdout]    |                                             ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/png/chunk/mod.rs:12:45
[INFO] [stdout]    |
[INFO] [stdout] 12 | type Result<T> = std::result::Result<T, Box<error::Error>>;
[INFO] [stdout]    |                                             ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/png/chunk/mod.rs:20:40
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn parse(buf: &[u8]) -> Result<Box<Chunk>> {
[INFO] [stdout]    |                                        ^^^^^ help: use `dyn`: `dyn Chunk`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/png/err.rs:38:32
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn cause(&self) -> Option<&error::Error> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/png/mod.rs:15:45
[INFO] [stdout]    |
[INFO] [stdout] 15 | type Result<T> = std::result::Result<T, Box<error::Error>>;
[INFO] [stdout]    |                                             ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/png/mod.rs:22:21
[INFO] [stdout]    |
[INFO] [stdout] 22 |     chunks: Vec<Box<chunk::Chunk>>,
[INFO] [stdout]    |                     ^^^^^^^^^^^^ help: use `dyn`: `dyn chunk::Chunk`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/png/mod.rs:30:24
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn parse(buf: &mut Read) -> Result<Png> {
[INFO] [stdout]    |                        ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]   --> src/png/chunk/ihdr.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     width: u32,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/png/chunk/ihdr.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     height: u32,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `bit_depth`
[INFO] [stdout]   --> src/png/chunk/ihdr.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     bit_depth: u8,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `color_type`
[INFO] [stdout]   --> src/png/chunk/ihdr.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     color_type: ColorType,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `interlace`
[INFO] [stdout]   --> src/png/chunk/ihdr.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     interlace: InterlaceMethod,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.65s
[INFO] running `Command { std: "docker" "inspect" "5d44aaecf49be99adfe3e3e0469f22a68a0a6ed193974597502250d56f1bc29e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5d44aaecf49be99adfe3e3e0469f22a68a0a6ed193974597502250d56f1bc29e", kill_on_drop: false }`
[INFO] [stdout] 5d44aaecf49be99adfe3e3e0469f22a68a0a6ed193974597502250d56f1bc29e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 58bcdbc63fdd57c59e9460da1997057fb0b89bd8ab1503c9fcf91ad25228e96e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "58bcdbc63fdd57c59e9460da1997057fb0b89bd8ab1503c9fcf91ad25228e96e", kill_on_drop: false }`
[INFO] [stderr]    Compiling img v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]   --> src/png/crc.rs:27:17
[INFO] [stdout]    |
[INFO] [stdout] 27 |                 (v >> 1)
[INFO] [stdout]    |                 ^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/png/chunk/ihdr.rs:11:45
[INFO] [stdout]    |
[INFO] [stdout] 11 | type Result<T> = std::result::Result<T, Box<error::Error>>;
[INFO] [stdout]    |                                             ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/png/chunk/mod.rs:12:45
[INFO] [stdout]    |
[INFO] [stdout] 12 | type Result<T> = std::result::Result<T, Box<error::Error>>;
[INFO] [stdout]    |                                             ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/png/chunk/mod.rs:20:40
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn parse(buf: &[u8]) -> Result<Box<Chunk>> {
[INFO] [stdout]    |                                        ^^^^^ help: use `dyn`: `dyn Chunk`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/png/err.rs:38:32
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn cause(&self) -> Option<&error::Error> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/png/mod.rs:15:45
[INFO] [stdout]    |
[INFO] [stdout] 15 | type Result<T> = std::result::Result<T, Box<error::Error>>;
[INFO] [stdout]    |                                             ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/png/mod.rs:22:21
[INFO] [stdout]    |
[INFO] [stdout] 22 |     chunks: Vec<Box<chunk::Chunk>>,
[INFO] [stdout]    |                     ^^^^^^^^^^^^ help: use `dyn`: `dyn chunk::Chunk`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/png/mod.rs:30:24
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn parse(buf: &mut Read) -> Result<Png> {
[INFO] [stdout]    |                        ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]   --> src/png/chunk/ihdr.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     width: u32,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/png/chunk/ihdr.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     height: u32,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `bit_depth`
[INFO] [stdout]   --> src/png/chunk/ihdr.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     bit_depth: u8,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `color_type`
[INFO] [stdout]   --> src/png/chunk/ihdr.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     color_type: ColorType,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `interlace`
[INFO] [stdout]   --> src/png/chunk/ihdr.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     interlace: InterlaceMethod,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `Command { std: "docker" "inspect" "58bcdbc63fdd57c59e9460da1997057fb0b89bd8ab1503c9fcf91ad25228e96e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58bcdbc63fdd57c59e9460da1997057fb0b89bd8ab1503c9fcf91ad25228e96e", kill_on_drop: false }`
[INFO] [stdout] 58bcdbc63fdd57c59e9460da1997057fb0b89bd8ab1503c9fcf91ad25228e96e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 3149570b0765f020f1a24f222e205695f33fb0ad5ace6557a9744f5898cbc3dc
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "3149570b0765f020f1a24f222e205695f33fb0ad5ace6557a9744f5898cbc3dc", kill_on_drop: false }`
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]   --> src/png/crc.rs:27:17
[INFO] [stderr]    |
[INFO] [stderr] 27 |                 (v >> 1)
[INFO] [stderr]    |                 ^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/png/chunk/ihdr.rs:11:45
[INFO] [stderr]    |
[INFO] [stderr] 11 | type Result<T> = std::result::Result<T, Box<error::Error>>;
[INFO] [stderr]    |                                             ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/png/chunk/mod.rs:12:45
[INFO] [stderr]    |
[INFO] [stderr] 12 | type Result<T> = std::result::Result<T, Box<error::Error>>;
[INFO] [stderr]    |                                             ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/png/chunk/mod.rs:20:40
[INFO] [stderr]    |
[INFO] [stderr] 20 | pub fn parse(buf: &[u8]) -> Result<Box<Chunk>> {
[INFO] [stderr]    |                                        ^^^^^ help: use `dyn`: `dyn Chunk`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/png/err.rs:38:32
[INFO] [stderr]    |
[INFO] [stderr] 38 |     fn cause(&self) -> Option<&error::Error> {
[INFO] [stderr]    |                                ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/png/mod.rs:15:45
[INFO] [stderr]    |
[INFO] [stderr] 15 | type Result<T> = std::result::Result<T, Box<error::Error>>;
[INFO] [stderr]    |                                             ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/png/mod.rs:22:21
[INFO] [stderr]    |
[INFO] [stderr] 22 |     chunks: Vec<Box<chunk::Chunk>>,
[INFO] [stderr]    |                     ^^^^^^^^^^^^ help: use `dyn`: `dyn chunk::Chunk`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/png/mod.rs:30:24
[INFO] [stderr]    |
[INFO] [stderr] 30 | pub fn parse(buf: &mut Read) -> Result<Png> {
[INFO] [stderr]    |                        ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `width`
[INFO] [stderr]   --> src/png/chunk/ihdr.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     width: u32,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `height`
[INFO] [stderr]   --> src/png/chunk/ihdr.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     height: u32,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `bit_depth`
[INFO] [stderr]   --> src/png/chunk/ihdr.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     bit_depth: u8,
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `color_type`
[INFO] [stderr]   --> src/png/chunk/ihdr.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     color_type: ColorType,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `interlace`
[INFO] [stderr]   --> src/png/chunk/ihdr.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     interlace: InterlaceMethod,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 13 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/img-3b5fcd0136494dd6
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test png::crc::tests::simple ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "3149570b0765f020f1a24f222e205695f33fb0ad5ace6557a9744f5898cbc3dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3149570b0765f020f1a24f222e205695f33fb0ad5ace6557a9744f5898cbc3dc", kill_on_drop: false }`
[INFO] [stdout] 3149570b0765f020f1a24f222e205695f33fb0ad5ace6557a9744f5898cbc3dc