[INFO] fetching crate micro-gui 0.1.0...
[INFO] testing micro-gui-0.1.0 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate micro-gui 0.1.0 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate micro-gui 0.1.0
[INFO] finished tweaking crates.io crate micro-gui 0.1.0
[INFO] tweaked toml for crates.io crate micro-gui 0.1.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate micro-gui 0.1.0 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 19 packages to latest compatible versions
[INFO] [stderr]       Adding sdl2 v0.30.0 (available: v0.38.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3f580f0df26e509aa68e37f329b8362db7ebdcf7077aa77e7f46b46d55be887a
[INFO] running `Command { std: "docker" "start" "-a" "3f580f0df26e509aa68e37f329b8362db7ebdcf7077aa77e7f46b46d55be887a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3f580f0df26e509aa68e37f329b8362db7ebdcf7077aa77e7f46b46d55be887a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f580f0df26e509aa68e37f329b8362db7ebdcf7077aa77e7f46b46d55be887a", kill_on_drop: false }`
[INFO] [stdout] 3f580f0df26e509aa68e37f329b8362db7ebdcf7077aa77e7f46b46d55be887a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f997165a8e79361e61cef19ca3c7b49559c2a61bab4aca3e870350f6511b187b
[INFO] running `Command { std: "docker" "start" "-a" "f997165a8e79361e61cef19ca3c7b49559c2a61bab4aca3e870350f6511b187b", kill_on_drop: false }`
[INFO] [stderr]    Compiling sdl2-sys v0.30.0
[INFO] [stderr]    Compiling lazy_static v0.2.11
[INFO] [stderr]    Compiling num-iter v0.1.45
[INFO] [stderr]    Compiling num v0.1.43
[INFO] [stderr]    Compiling sdl2 v0.30.0
[INFO] [stderr]    Compiling micro-gui v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/core/layer.rs:12:31
[INFO] [stdout]    |
[INFO] [stdout] 12 |     renderer: Option<&'a mut (Renderable<Pixel> + 'a)>,
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 12 |     renderer: Option<&'a mut (dyn Renderable<Pixel> + 'a)>,
[INFO] [stdout]    |                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/core/window.rs:19:30
[INFO] [stdout]    |
[INFO] [stdout] 19 |     on_load: Option<&'a mut (OnLoad + 'a)>,
[INFO] [stdout]    |                              ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 19 |     on_load: Option<&'a mut (dyn OnLoad + 'a)>,
[INFO] [stdout]    |                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/core/window.rs:20:32
[INFO] [stdout]    |
[INFO] [stdout] 20 |     on_unload: Option<&'a mut (OnUnload + 'a)>,
[INFO] [stdout]    |                                ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 20 |     on_unload: Option<&'a mut (dyn OnUnload + 'a)>,
[INFO] [stdout]    |                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/core/window.rs:21:31
[INFO] [stdout]    |
[INFO] [stdout] 21 |     on_event: Option<&'a mut (OnEvent + 'a)>
[INFO] [stdout]    |                               ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 21 |     on_event: Option<&'a mut (dyn OnEvent + 'a)>
[INFO] [stdout]    |                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/graphics/mod.rs:17:71
[INFO] [stdout]    |
[INFO] [stdout] 17 |     fn render(&mut self, graphics: &mut Graphics<Pixel>, buffer: &mut Buff<Pixel>);
[INFO] [stdout]    |                                                                       ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 17 |     fn render(&mut self, graphics: &mut Graphics<Pixel>, buffer: &mut dyn Buff<Pixel>);
[INFO] [stdout]    |                                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/core/layer.rs:18:56
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn new(bounds: Rect, renderer: Option<&'a mut (Renderable<Pixel> + 'a)>) -> Layer<'a, Pixel> {
[INFO] [stdout]    |                                                        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn new(bounds: Rect, renderer: Option<&'a mut (dyn Renderable<Pixel> + 'a)>) -> Layer<'a, Pixel> {
[INFO] [stdout]    |                                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/core/layer.rs:35:71
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn render(&mut self, graphics: &mut Graphics<Pixel>, buffer: &mut Buff<Pixel>) {
[INFO] [stdout]    |                                                                       ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn render(&mut self, graphics: &mut Graphics<Pixel>, buffer: &mut dyn Buff<Pixel>) {
[INFO] [stdout]    |                                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/core/window.rs:41:62
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub fn new(w: usize, h: usize, renderer: Option<&'a mut (Renderable<Pixel> + 'a)>) -> Self {
[INFO] [stdout]    |                                                              ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub fn new(w: usize, h: usize, renderer: Option<&'a mut (dyn Renderable<Pixel> + 'a)>) -> Self {
[INFO] [stdout]    |                                                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/core/window.rs:48:61
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub fn bind_handlers(&mut self, on_load: Option<&'a mut OnLoad>, on_unload: Option<&'a mut OnUnload>, on_event: Option<&'a mut OnEven...
[INFO] [stdout]    |                                                             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub fn bind_handlers(&mut self, on_load: Option<&'a mut dyn OnLoad>, on_unload: Option<&'a mut OnUnload>, on_event: Option<&'a mut OnEvent>) {
[INFO] [stdout]    |                                                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/core/window.rs:48:96
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub fn bind_handlers(&mut self, on_load: Option<&'a mut OnLoad>, on_unload: Option<&'a mut OnUnload>, on_event: Option<&'a mut OnEven...
[INFO] [stdout]    |                                                                                                ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub fn bind_handlers(&mut self, on_load: Option<&'a mut OnLoad>, on_unload: Option<&'a mut dyn OnUnload>, on_event: Option<&'a mut OnEvent>) {
[INFO] [stdout]    |                                                                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/core/window.rs:48:132
[INFO] [stdout]    |
[INFO] [stdout] 48 | ... on_unload: Option<&'a mut OnUnload>, on_event: Option<&'a mut OnEvent>) {
[INFO] [stdout]    |                                                                   ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub fn bind_handlers(&mut self, on_load: Option<&'a mut OnLoad>, on_unload: Option<&'a mut OnUnload>, on_event: Option<&'a mut dyn OnEvent>) {
[INFO] [stdout]    |                                                                                                                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/core/window.rs:55:75
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub fn render(&mut self, graphics: &mut Graphics<Pixel>, buffer: &mut Buff<Pixel>) {
[INFO] [stdout]    |                                                                           ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub fn render(&mut self, graphics: &mut Graphics<Pixel>, buffer: &mut dyn Buff<Pixel>) {
[INFO] [stdout]    |                                                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gui.rs:44:41
[INFO] [stdout]    |
[INFO] [stdout] 44 |     pub fn render(&mut self, buff: &mut Buff<Pixel>) {
[INFO] [stdout]    |                                         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 44 |     pub fn render(&mut self, buff: &mut dyn Buff<Pixel>) {
[INFO] [stdout]    |                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/graphics/mod.rs:44:31
[INFO] [stdout]    |
[INFO] [stdout] 44 |     pub fn set(&self, b: &mut Buff<Pixel>, x: usize, y: usize, p: &Pixel) {
[INFO] [stdout]    |                               ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 44 |     pub fn set(&self, b: &mut dyn Buff<Pixel>, x: usize, y: usize, p: &Pixel) {
[INFO] [stdout]    |                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/graphics/mod.rs:73:39
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub fn draw_line(&self, buf: &mut Buff<Pixel>, p1: Point, p2: Point, p: &Pixel) {
[INFO] [stdout]    |                                       ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub fn draw_line(&self, buf: &mut dyn Buff<Pixel>, p1: Point, p2: Point, p: &Pixel) {
[INFO] [stdout]    |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/graphics/mod.rs:133:37
[INFO] [stdout]     |
[INFO] [stdout] 133 |     pub fn draw_rect(&self, b: &mut Buff<Pixel>, r: Rect, p: &Pixel) {
[INFO] [stdout]     |                                     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 133 |     pub fn draw_rect(&self, b: &mut dyn Buff<Pixel>, r: Rect, p: &Pixel) {
[INFO] [stdout]     |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/graphics/mod.rs:145:37
[INFO] [stdout]     |
[INFO] [stdout] 145 |     pub fn fill_rect(&self, b: &mut Buff<Pixel>, r: Rect, p: &Pixel) {
[INFO] [stdout]     |                                     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 145 |     pub fn fill_rect(&self, b: &mut dyn Buff<Pixel>, r: Rect, p: &Pixel) {
[INFO] [stdout]     |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/graphics/mod.rs:154:41
[INFO] [stdout]     |
[INFO] [stdout] 154 |     pub fn draw_polyline(&self, b: &mut Buff<Pixel>, points: &[Point], p: &Pixel) {
[INFO] [stdout]     |                                         ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 154 |     pub fn draw_polyline(&self, b: &mut dyn Buff<Pixel>, points: &[Point], p: &Pixel) {
[INFO] [stdout]     |                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/graphics/mod.rs:164:42
[INFO] [stdout]     |
[INFO] [stdout] 164 |     pub fn draw_ellipse(&self, buf: &mut Buff<Pixel>, r: Rect, p: &Pixel) {
[INFO] [stdout]     |                                          ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 164 |     pub fn draw_ellipse(&self, buf: &mut dyn Buff<Pixel>, r: Rect, p: &Pixel) {
[INFO] [stdout]     |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/widgets/demo.rs:23:71
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn render(&mut self, graphics: &mut Graphics<Pixel>, buffer: &mut Buff<Pixel>) {
[INFO] [stdout]    |                                                                       ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn render(&mut self, graphics: &mut Graphics<Pixel>, buffer: &mut dyn Buff<Pixel>) {
[INFO] [stdout]    |                                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `limit` is never used
[INFO] [stdout]   --> src/graphics/mod.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | impl <Pixel>Graphics<Pixel> {
[INFO] [stdout]    | --------------------------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 66 |     fn limit(min: usize, max: usize, actual: usize) -> usize {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note:  "cc" "-m64" "/tmp/rustcqWFuLt/symbols.o" "<10 object files omitted>" "-Wl,--as-needed" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/{libmicro_gui-dce2f07e5e18a005,libsdl2-92207d17c0a22d9e,librand-a4bdcec6f7a89244,librand-c3348abdc94f84fc,libsdl2_sys-a02e868f78acaa42,libbitflags-7ba9f91ea1bab136,liblazy_static-b753bb378fbdd6b0,liblibc-7a54cdb917ea7291,libnum-caaadc89431b0eb4,libnum_iter-4feb00a5290ba293,libnum_integer-cb9b9956fc5cd6cb,libnum_traits-c445de6622136476}.rlib" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib/{libstd-*,libpanic_unwind-*,libobject-*,libmemchr-*,libaddr2line-*,libgimli-*,libcfg_if-*,librustc_demangle-*,libstd_detect-*,libhashbrown-*,librustc_std_workspace_alloc-*,libminiz_oxide-*,libadler2-*,libunwind-*,liblibc-*,librustc_std_workspace_core-*,liballoc-*,libcore-*,libcompiler_builtins-*}.rlib" "-Wl,-Bdynamic" "-lSDL2_image" "-lSDL2" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-L" "/tmp/rustcqWFuLt/raw-dylibs" "-B<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-fuse-ld=lld" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/opt/rustwide/target/debug/deps/micro_gui_example-d6d19992df446766" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs"
[INFO] [stdout]   = note: some arguments are omitted. use `--verbose` to show all linker arguments
[INFO] [stdout]   = note: rust-lld: error: unable to find library -lSDL2_image
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `micro-gui` (bin "micro-gui-example") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "f997165a8e79361e61cef19ca3c7b49559c2a61bab4aca3e870350f6511b187b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f997165a8e79361e61cef19ca3c7b49559c2a61bab4aca3e870350f6511b187b", kill_on_drop: false }`
[INFO] [stdout] f997165a8e79361e61cef19ca3c7b49559c2a61bab4aca3e870350f6511b187b
