[INFO] fetching crate exoquant 0.2.0...
[INFO] crate exoquant 0.2.0 is already in cache
[INFO] crate exoquant 0.2.0 is already in cache
[INFO] crate exoquant 0.2.0 is already in cache
[INFO] crate exoquant 0.2.0 is already in cache
[INFO] crate exoquant 0.2.0 is already in cache
[INFO] crate exoquant 0.2.0 is already in cache
[INFO] crate exoquant 0.2.0 is already in cache
[INFO] crate exoquant 0.2.0 is already in cache
[INFO] crate exoquant 0.2.0 is already in cache
[INFO] crate exoquant 0.2.0 is already in cache
[INFO] crate exoquant 0.2.0 is already in cache
[INFO] crate exoquant 0.2.0 is already in cache
[INFO] crate exoquant 0.2.0 is already in cache
[INFO] crate exoquant 0.2.0 is already in cache
[INFO] checking exoquant-0.2.0 against master#af7ab3447079fddc51c6c7749b160d24769f7c16 for pr-99413
[INFO] extracting crate exoquant 0.2.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate exoquant 0.2.0 on toolchain af7ab3447079fddc51c6c7749b160d24769f7c16
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+af7ab3447079fddc51c6c7749b160d24769f7c16" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate exoquant 0.2.0
[INFO] finished tweaking crates.io crate exoquant 0.2.0
[INFO] tweaked toml for crates.io crate exoquant 0.2.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+af7ab3447079fddc51c6c7749b160d24769f7c16" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+af7ab3447079fddc51c6c7749b160d24769f7c16" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:ecb52c4cf6672b83cc996368a05b4a059042425f2b6ba9cd23a06cdead5d8d70" "/opt/rustwide/cargo-home/bin/cargo" "+af7ab3447079fddc51c6c7749b160d24769f7c16" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4cb32aed8c5c8ad5f0be2ede62cc97f8d73ec85a1969030cd253ca59eed079f7
[INFO] running `Command { std: "docker" "start" "-a" "4cb32aed8c5c8ad5f0be2ede62cc97f8d73ec85a1969030cd253ca59eed079f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4cb32aed8c5c8ad5f0be2ede62cc97f8d73ec85a1969030cd253ca59eed079f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4cb32aed8c5c8ad5f0be2ede62cc97f8d73ec85a1969030cd253ca59eed079f7", kill_on_drop: false }`
[INFO] [stdout] 4cb32aed8c5c8ad5f0be2ede62cc97f8d73ec85a1969030cd253ca59eed079f7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:ecb52c4cf6672b83cc996368a05b4a059042425f2b6ba9cd23a06cdead5d8d70" "/opt/rustwide/cargo-home/bin/cargo" "+af7ab3447079fddc51c6c7749b160d24769f7c16" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 89f535447c6ef6213370625196ca330a5268c5c4de19822b57731e577f52a972
[INFO] running `Command { std: "docker" "start" "-a" "89f535447c6ef6213370625196ca330a5268c5c4de19822b57731e577f52a972", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.127
[INFO] [stderr]    Compiling lodepng v0.8.1
[INFO] [stderr]     Checking bytemuck v1.11.0
[INFO] [stderr]     Checking c_vec v1.0.12
[INFO] [stderr]     Checking exoquant v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/histogram.rs:53:48
[INFO] [stdout]    |
[INFO] [stdout] 53 |     pub fn to_color_counts(&self, colorspace: &ColorSpace) -> Vec<ColorCount> {
[INFO] [stdout]    |                                                ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 53 -     pub fn to_color_counts(&self, colorspace: &ColorSpace) -> Vec<ColorCount> {
[INFO] [stdout] 53 +     pub fn to_color_counts(&self, colorspace: &dyn ColorSpace) -> Vec<ColorCount> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/histogram.rs:66:38
[INFO] [stdout]    |
[INFO] [stdout] 66 |     pub fn iter<'a>(&'a self) -> Box<Iterator<Item = (&Color, &usize)> + 'a> {
[INFO] [stdout]    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 66 -     pub fn iter<'a>(&'a self) -> Box<Iterator<Item = (&Color, &usize)> + 'a> {
[INFO] [stdout] 66 +     pub fn iter<'a>(&'a self) -> Box<dyn Iterator<Item = (&Color, &usize)> + 'a> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/quantizer.rs:211:39
[INFO] [stdout]     |
[INFO] [stdout] 211 |     pub fn optimize(self, optimizer: &Optimizer, num_iterations: usize) -> Quantizer {
[INFO] [stdout]     |                                       ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 211 -     pub fn optimize(self, optimizer: &Optimizer, num_iterations: usize) -> Quantizer {
[INFO] [stdout] 211 +     pub fn optimize(self, optimizer: &dyn Optimizer, num_iterations: usize) -> Quantizer {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/remapper.rs:73:38
[INFO] [stdout]    |
[INFO] [stdout] 73 |                           image: Box<Iterator<Item = Color> + 'b>,
[INFO] [stdout]    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 73 -                           image: Box<Iterator<Item = Color> + 'b>,
[INFO] [stdout] 73 +                           image: Box<dyn Iterator<Item = Color> + 'b>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/remapper.rs:75:34
[INFO] [stdout]    |
[INFO] [stdout] 75 |                           -> Box<Iterator<Item = u8> + 'b> {
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 75 -                           -> Box<Iterator<Item = u8> + 'b> {
[INFO] [stdout] 75 +                           -> Box<dyn Iterator<Item = u8> + 'b> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/remapper.rs:87:44
[INFO] [stdout]    |
[INFO] [stdout] 87 | ...                   image: Box<Iterator<Item = Color> + 'b>,
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 87 -                                 image: Box<Iterator<Item = Color> + 'b>,
[INFO] [stdout] 87 +                                 image: Box<dyn Iterator<Item = Color> + 'b>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/remapper.rs:89:40
[INFO] [stdout]    |
[INFO] [stdout] 89 | ...                   -> Box<Iterator<Item = usize> + 'b> {
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 89 -                                 -> Box<Iterator<Item = usize> + 'b> {
[INFO] [stdout] 89 +                                 -> Box<dyn Iterator<Item = usize> + 'b> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/optimizer.rs:27:38
[INFO] [stdout]    |
[INFO] [stdout] 27 |                         colorspace: &ColorSpace,
[INFO] [stdout]    |                                      ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 27 -                         colorspace: &ColorSpace,
[INFO] [stdout] 27 +                         colorspace: &dyn ColorSpace,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:13:29
[INFO] [stdout]    |
[INFO] [stdout] 13 |                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 13 -                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout] 13 +                  image: Box<dyn Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:16:34
[INFO] [stdout]    |
[INFO] [stdout] 16 |                  colorspace: &'a ColorSpace)
[INFO] [stdout]    |                                  ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 16 -                  colorspace: &'a ColorSpace)
[INFO] [stdout] 16 +                  colorspace: &'a dyn ColorSpace)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:17:25
[INFO] [stdout]    |
[INFO] [stdout] 17 |                  -> Box<Iterator<Item = usize> + 'a>;
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 17 -                  -> Box<Iterator<Item = usize> + 'a>;
[INFO] [stdout] 17 +                  -> Box<dyn Iterator<Item = usize> + 'a>;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:25:29
[INFO] [stdout]    |
[INFO] [stdout] 25 |                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 25 -                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout] 25 +                  image: Box<dyn Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:28:25
[INFO] [stdout]    |
[INFO] [stdout] 28 |                  _: &'a ColorSpace)
[INFO] [stdout]    |                         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 28 -                  _: &'a ColorSpace)
[INFO] [stdout] 28 +                  _: &'a dyn ColorSpace)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:29:25
[INFO] [stdout]    |
[INFO] [stdout] 29 |                  -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 29 -                  -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout] 29 +                  -> Box<dyn Iterator<Item = usize> + 'a> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:46:29
[INFO] [stdout]    |
[INFO] [stdout] 46 |                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 46 -                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout] 46 +                  image: Box<dyn Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:49:25
[INFO] [stdout]    |
[INFO] [stdout] 49 |                  _: &'a ColorSpace)
[INFO] [stdout]    |                         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 49 -                  _: &'a ColorSpace)
[INFO] [stdout] 49 +                  _: &'a dyn ColorSpace)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:50:25
[INFO] [stdout]    |
[INFO] [stdout] 50 |                  -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 50 -                  -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout] 50 +                  -> Box<dyn Iterator<Item = usize> + 'a> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:85:29
[INFO] [stdout]    |
[INFO] [stdout] 85 |                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 85 -                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout] 85 +                  image: Box<dyn Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:88:34
[INFO] [stdout]    |
[INFO] [stdout] 88 |                  colorspace: &'a ColorSpace)
[INFO] [stdout]    |                                  ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 88 -                  colorspace: &'a ColorSpace)
[INFO] [stdout] 88 +                  colorspace: &'a dyn ColorSpace)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:89:25
[INFO] [stdout]    |
[INFO] [stdout] 89 |                  -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 89 -                  -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout] 89 +                  -> Box<dyn Iterator<Item = usize> + 'a> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking rgb v0.8.33
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/histogram.rs:53:48
[INFO] [stdout]    |
[INFO] [stdout] 53 |     pub fn to_color_counts(&self, colorspace: &ColorSpace) -> Vec<ColorCount> {
[INFO] [stdout]    |                                                ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 53 -     pub fn to_color_counts(&self, colorspace: &ColorSpace) -> Vec<ColorCount> {
[INFO] [stdout] 53 +     pub fn to_color_counts(&self, colorspace: &dyn ColorSpace) -> Vec<ColorCount> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/histogram.rs:66:38
[INFO] [stdout]    |
[INFO] [stdout] 66 |     pub fn iter<'a>(&'a self) -> Box<Iterator<Item = (&Color, &usize)> + 'a> {
[INFO] [stdout]    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 66 -     pub fn iter<'a>(&'a self) -> Box<Iterator<Item = (&Color, &usize)> + 'a> {
[INFO] [stdout] 66 +     pub fn iter<'a>(&'a self) -> Box<dyn Iterator<Item = (&Color, &usize)> + 'a> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/quantizer.rs:211:39
[INFO] [stdout]     |
[INFO] [stdout] 211 |     pub fn optimize(self, optimizer: &Optimizer, num_iterations: usize) -> Quantizer {
[INFO] [stdout]     |                                       ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 211 -     pub fn optimize(self, optimizer: &Optimizer, num_iterations: usize) -> Quantizer {
[INFO] [stdout] 211 +     pub fn optimize(self, optimizer: &dyn Optimizer, num_iterations: usize) -> Quantizer {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/remapper.rs:73:38
[INFO] [stdout]    |
[INFO] [stdout] 73 |                           image: Box<Iterator<Item = Color> + 'b>,
[INFO] [stdout]    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 73 -                           image: Box<Iterator<Item = Color> + 'b>,
[INFO] [stdout] 73 +                           image: Box<dyn Iterator<Item = Color> + 'b>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/remapper.rs:75:34
[INFO] [stdout]    |
[INFO] [stdout] 75 |                           -> Box<Iterator<Item = u8> + 'b> {
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 75 -                           -> Box<Iterator<Item = u8> + 'b> {
[INFO] [stdout] 75 +                           -> Box<dyn Iterator<Item = u8> + 'b> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/remapper.rs:87:44
[INFO] [stdout]    |
[INFO] [stdout] 87 | ...                   image: Box<Iterator<Item = Color> + 'b>,
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 87 -                                 image: Box<Iterator<Item = Color> + 'b>,
[INFO] [stdout] 87 +                                 image: Box<dyn Iterator<Item = Color> + 'b>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/remapper.rs:89:40
[INFO] [stdout]    |
[INFO] [stdout] 89 | ...                   -> Box<Iterator<Item = usize> + 'b> {
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 89 -                                 -> Box<Iterator<Item = usize> + 'b> {
[INFO] [stdout] 89 +                                 -> Box<dyn Iterator<Item = usize> + 'b> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/optimizer.rs:27:38
[INFO] [stdout]    |
[INFO] [stdout] 27 |                         colorspace: &ColorSpace,
[INFO] [stdout]    |                                      ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 27 -                         colorspace: &ColorSpace,
[INFO] [stdout] 27 +                         colorspace: &dyn ColorSpace,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:13:29
[INFO] [stdout]    |
[INFO] [stdout] 13 |                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 13 -                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout] 13 +                  image: Box<dyn Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:16:34
[INFO] [stdout]    |
[INFO] [stdout] 16 |                  colorspace: &'a ColorSpace)
[INFO] [stdout]    |                                  ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 16 -                  colorspace: &'a ColorSpace)
[INFO] [stdout] 16 +                  colorspace: &'a dyn ColorSpace)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:17:25
[INFO] [stdout]    |
[INFO] [stdout] 17 |                  -> Box<Iterator<Item = usize> + 'a>;
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 17 -                  -> Box<Iterator<Item = usize> + 'a>;
[INFO] [stdout] 17 +                  -> Box<dyn Iterator<Item = usize> + 'a>;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:25:29
[INFO] [stdout]    |
[INFO] [stdout] 25 |                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 25 -                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout] 25 +                  image: Box<dyn Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:28:25
[INFO] [stdout]    |
[INFO] [stdout] 28 |                  _: &'a ColorSpace)
[INFO] [stdout]    |                         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 28 -                  _: &'a ColorSpace)
[INFO] [stdout] 28 +                  _: &'a dyn ColorSpace)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:29:25
[INFO] [stdout]    |
[INFO] [stdout] 29 |                  -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 29 -                  -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout] 29 +                  -> Box<dyn Iterator<Item = usize> + 'a> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:46:29
[INFO] [stdout]    |
[INFO] [stdout] 46 |                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 46 -                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout] 46 +                  image: Box<dyn Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:49:25
[INFO] [stdout]    |
[INFO] [stdout] 49 |                  _: &'a ColorSpace)
[INFO] [stdout]    |                         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 49 -                  _: &'a ColorSpace)
[INFO] [stdout] 49 +                  _: &'a dyn ColorSpace)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:50:25
[INFO] [stdout]    |
[INFO] [stdout] 50 |                  -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 50 -                  -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout] 50 +                  -> Box<dyn Iterator<Item = usize> + 'a> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:85:29
[INFO] [stdout]    |
[INFO] [stdout] 85 |                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 85 -                  image: Box<Iterator<Item = Colorf> + 'a>,
[INFO] [stdout] 85 +                  image: Box<dyn Iterator<Item = Colorf> + 'a>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:88:34
[INFO] [stdout]    |
[INFO] [stdout] 88 |                  colorspace: &'a ColorSpace)
[INFO] [stdout]    |                                  ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 88 -                  colorspace: &'a ColorSpace)
[INFO] [stdout] 88 +                  colorspace: &'a dyn ColorSpace)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ditherer.rs:89:25
[INFO] [stdout]    |
[INFO] [stdout] 89 |                  -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 89 -                  -> Box<Iterator<Item = usize> + 'a> {
[INFO] [stdout] 89 +                  -> Box<dyn Iterator<Item = usize> + 'a> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.85s
[ERROR] error running command: no output for 300 seconds
[INFO] running `Command { std: "docker" "inspect" "89f535447c6ef6213370625196ca330a5268c5c4de19822b57731e577f52a972", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89f535447c6ef6213370625196ca330a5268c5c4de19822b57731e577f52a972", kill_on_drop: false }`
[INFO] [stdout] 89f535447c6ef6213370625196ca330a5268c5c4de19822b57731e577f52a972