[INFO] cloning repository https://github.com/shiMusa/Simple-Conrod
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shiMusa/Simple-Conrod" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FshiMusa%2FSimple-Conrod", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FshiMusa%2FSimple-Conrod'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4376f5dce5c7c19411fb40494e79a53616ea4b7a
[INFO] checking shiMusa/Simple-Conrod against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FshiMusa%2FSimple-Conrod" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/shiMusa/Simple-Conrod on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/shiMusa/Simple-Conrod
[INFO] finished tweaking git repo https://github.com/shiMusa/Simple-Conrod
[INFO] tweaked toml for git repo https://github.com/shiMusa/Simple-Conrod written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/shiMusa/Simple-Conrod already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dc25e8ad6fc422c5913e3a5fb795240ac3c89badb383e43e91dbb3d86091ea85
[INFO] running `Command { std: "docker" "start" "-a" "dc25e8ad6fc422c5913e3a5fb795240ac3c89badb383e43e91dbb3d86091ea85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dc25e8ad6fc422c5913e3a5fb795240ac3c89badb383e43e91dbb3d86091ea85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc25e8ad6fc422c5913e3a5fb795240ac3c89badb383e43e91dbb3d86091ea85", kill_on_drop: false }`
[INFO] [stdout] dc25e8ad6fc422c5913e3a5fb795240ac3c89badb383e43e91dbb3d86091ea85
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0859dfe13278e3f5e9cfdadac0cf230008158ac9791f7c9ec3eccc0b0cd711a0
[INFO] running `Command { std: "docker" "start" "-a" "0859dfe13278e3f5e9cfdadac0cf230008158ac9791f7c9ec3eccc0b0cd711a0", kill_on_drop: false }`
[INFO] [stderr]    Compiling khronos_api v2.1.0
[INFO] [stderr]     Checking memoffset v0.2.1
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]    Compiling rayon-core v1.4.0
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[INFO] [stderr]     Checking fixedbitset v0.1.8
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[INFO] [stderr]     Checking find_folder v0.3.0
[INFO] [stderr]     Checking inflate v0.3.4
[INFO] [stderr]     Checking num-complex v0.1.41
[INFO] [stderr]     Checking num-bigint v0.1.41
[INFO] [stderr]     Checking ordered-float v0.5.0
[INFO] [stderr]    Compiling conrod_derive v0.1.0
[INFO] [stderr]     Checking winit v0.10.0
[INFO] [stderr]     Checking crossbeam-epoch v0.3.0
[INFO] [stderr]    Compiling gl_generator v0.7.0
[INFO] [stderr]    Compiling gl_generator v0.8.0
[INFO] [stderr]     Checking gif v0.9.2
[INFO] [stderr]     Checking petgraph v0.4.11
[INFO] [stderr]     Checking rusttype v0.3.0
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[INFO] [stderr]     Checking png v0.11.0
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[INFO] [stderr]    Compiling glutin v0.12.0
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[INFO] [stderr]     Checking daggy v0.5.0
[INFO] [stderr]     Checking num v0.1.41
[INFO] [stderr]     Checking jpeg-decoder v0.1.14
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[INFO] [stderr]     Checking conrod v0.57.0 (https://github.com/PistonDevelopers/conrod.git#db1372f1)
[INFO] [stderr]     Checking conrod_test v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: lint `unused_doc_comment` has been renamed to `unused_doc_comments`
[INFO] [stdout]    --> src/lib.rs:454:13
[INFO] [stdout]     |
[INFO] [stdout] 454 |     #[allow(unused_doc_comment)]
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^ help: use the new name: `unused_doc_comments`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(renamed_and_removed_lints)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lint `unused_doc_comment` has been renamed to `unused_doc_comments`
[INFO] [stdout]    --> src/lib.rs:454:13
[INFO] [stdout]     |
[INFO] [stdout] 454 |     #[allow(unused_doc_comment)]
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^ help: use the new name: `unused_doc_comments`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(renamed_and_removed_lints)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lint `unused_doc_comment` has been renamed to `unused_doc_comments`
[INFO] [stdout]    --> src/lib.rs:454:13
[INFO] [stdout]     |
[INFO] [stdout] 454 |     #[allow(unused_doc_comment)]
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^ help: use the new name: `unused_doc_comments`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lint `unused_doc_comment` has been renamed to `unused_doc_comments`
[INFO] [stdout]    --> src/lib.rs:454:13
[INFO] [stdout]     |
[INFO] [stdout] 454 |     #[allow(unused_doc_comment)]
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^ help: use the new name: `unused_doc_comments`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/elements/container.rs:48:21
[INFO] [stdout]    |
[INFO] [stdout] 48 |     layers: Vec<Box<Element>>,
[INFO] [stdout]    |                     ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/elements/container.rs:65:41
[INFO] [stdout]    |
[INFO] [stdout] 65 |     pub fn push(&mut self, element: Box<Element>) {
[INFO] [stdout]    |                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/elements/container.rs:70:57
[INFO] [stdout]    |
[INFO] [stdout] 70 |     pub fn insert(&mut self, index: usize, element: Box<Element>) {
[INFO] [stdout]    |                                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/elements/container.rs:79:41
[INFO] [stdout]    |
[INFO] [stdout] 79 |     pub fn pop(&mut self) -> Option<Box<Element>> {
[INFO] [stdout]    |                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/elements/container.rs:83:51
[INFO] [stdout]    |
[INFO] [stdout] 83 |     pub fn remove(&mut self, index: usize) -> Box<Element> {
[INFO] [stdout]    |                                                   ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `i32` is imported redundantly
[INFO] [stdout]    --> src/elements/container.rs:158:13
[INFO] [stdout]     |
[INFO] [stdout] 4   | use elements::{*, action::*};
[INFO] [stdout]     |                - the item `i32` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 158 |         use std::i32;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/container.rs:222:23
[INFO] [stdout]     |
[INFO] [stdout] 222 |     elements: Vec<Box<Element>>,
[INFO] [stdout]     |                       ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/container.rs:249:41
[INFO] [stdout]     |
[INFO] [stdout] 249 |     pub fn push(&mut self, element: Box<Element>) {
[INFO] [stdout]     |                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/container.rs:254:57
[INFO] [stdout]     |
[INFO] [stdout] 254 |     pub fn insert(&mut self, index: usize, element: Box<Element>) {
[INFO] [stdout]     |                                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/container.rs:269:41
[INFO] [stdout]     |
[INFO] [stdout] 269 |     pub fn pop(&mut self) -> Option<Box<Element>> {
[INFO] [stdout]     |                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/container.rs:276:51
[INFO] [stdout]     |
[INFO] [stdout] 276 |     pub fn remove(&mut self, index: usize) -> Box<Element> {
[INFO] [stdout]     |                                                   ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/container.rs:486:18
[INFO] [stdout]     |
[INFO] [stdout] 486 |     element: Box<Element>,
[INFO] [stdout]     |                  ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/container.rs:503:29
[INFO] [stdout]     |
[INFO] [stdout] 503 |     pub fn new(element: Box<Element>, alignment: PadAlignment, size: PadElementSize) -> Box<Self> {
[INFO] [stdout]     |                             ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/elements/container.rs:48:21
[INFO] [stdout]    |
[INFO] [stdout] 48 |     layers: Vec<Box<Element>>,
[INFO] [stdout]    |                     ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `i32` is imported redundantly
[INFO] [stdout]    --> src/elements/basic.rs:139:13
[INFO] [stdout]     |
[INFO] [stdout] 7   | use elements::{*, action::*};
[INFO] [stdout]     |                - the item `i32` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 139 |         use std::i32;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/elements/container.rs:65:41
[INFO] [stdout]    |
[INFO] [stdout] 65 |     pub fn push(&mut self, element: Box<Element>) {
[INFO] [stdout]    |                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:166:22
[INFO] [stdout]     |
[INFO] [stdout] 166 |     pub element: Box<Animateable>,
[INFO] [stdout]     |                      ^^^^^^^^^^^ help: use `dyn`: `dyn Animateable`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:168:32
[INFO] [stdout]     |
[INFO] [stdout] 168 |     size_animation: Option<Box<SizeAnimation>>,
[INFO] [stdout]     |                                ^^^^^^^^^^^^^ help: use `dyn`: `dyn SizeAnimation`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/elements/container.rs:70:57
[INFO] [stdout]    |
[INFO] [stdout] 70 |     pub fn insert(&mut self, index: usize, element: Box<Element>) {
[INFO] [stdout]    |                                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:169:36
[INFO] [stdout]     |
[INFO] [stdout] 169 |     position_animation: Option<Box<PositionAnimation>>,
[INFO] [stdout]     |                                    ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn PositionAnimation`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/elements/container.rs:79:41
[INFO] [stdout]    |
[INFO] [stdout] 79 |     pub fn pop(&mut self) -> Option<Box<Element>> {
[INFO] [stdout]    |                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:179:29
[INFO] [stdout]     |
[INFO] [stdout] 179 |     pub fn new(element: Box<Animateable>) -> Box<Self> {
[INFO] [stdout]     |                             ^^^^^^^^^^^ help: use `dyn`: `dyn Animateable`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/elements/container.rs:83:51
[INFO] [stdout]    |
[INFO] [stdout] 83 |     pub fn remove(&mut self, index: usize) -> Box<Element> {
[INFO] [stdout]    |                                                   ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `i32` is imported redundantly
[INFO] [stdout]    --> src/elements/container.rs:158:13
[INFO] [stdout]     |
[INFO] [stdout] 4   | use elements::{*, action::*};
[INFO] [stdout]     |                - the item `i32` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 158 |         use std::i32;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:200:57
[INFO] [stdout]     |
[INFO] [stdout] 200 |     pub fn with_size_animation(mut self, animation: Box<SizeAnimation>) -> Box<Self> {
[INFO] [stdout]     |                                                         ^^^^^^^^^^^^^ help: use `dyn`: `dyn SizeAnimation`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/container.rs:222:23
[INFO] [stdout]     |
[INFO] [stdout] 222 |     elements: Vec<Box<Element>>,
[INFO] [stdout]     |                       ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:205:61
[INFO] [stdout]     |
[INFO] [stdout] 205 |     pub fn with_position_animation(mut self, animation: Box<PositionAnimation>) -> Box<Self> {
[INFO] [stdout]     |                                                             ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn PositionAnimation`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:392:18
[INFO] [stdout]     |
[INFO] [stdout] 392 |     receive: Box<Fn(&mut E, ActionMsg)>,
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&mut E, ActionMsg)`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/container.rs:249:41
[INFO] [stdout]     |
[INFO] [stdout] 249 |     pub fn push(&mut self, element: Box<Element>) {
[INFO] [stdout]     |                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:408:51
[INFO] [stdout]     |
[INFO] [stdout] 408 |     pub fn with_action_receive(mut self, fun: Box<Fn(&mut E, ActionMsg)>) -> Box<Self> {
[INFO] [stdout]     |                                                   ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&mut E, ActionMsg)`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/container.rs:254:57
[INFO] [stdout]     |
[INFO] [stdout] 254 |     pub fn insert(&mut self, index: usize, element: Box<Element>) {
[INFO] [stdout]     |                                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/container.rs:269:41
[INFO] [stdout]     |
[INFO] [stdout] 269 |     pub fn pop(&mut self) -> Option<Box<Element>> {
[INFO] [stdout]     |                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/mod.rs:211:25
[INFO] [stdout]     |
[INFO] [stdout] 211 |     element: Option<Box<Element>>,
[INFO] [stdout]     |                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/mod.rs:256:48
[INFO] [stdout]     |
[INFO] [stdout] 256 |     pub fn add_element(&mut self, element: Box<Element>) {
[INFO] [stdout]     |                                                ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/container.rs:276:51
[INFO] [stdout]     |
[INFO] [stdout] 276 |     pub fn remove(&mut self, index: usize) -> Box<Element> {
[INFO] [stdout]     |                                                   ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/composites/mod.rs:330:23
[INFO] [stdout]     |
[INFO] [stdout] 330 |     elements: Vec<Box<Element>>,
[INFO] [stdout]     |                       ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/container.rs:486:18
[INFO] [stdout]     |
[INFO] [stdout] 486 |     element: Box<Element>,
[INFO] [stdout]     |                  ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `i32` is imported redundantly
[INFO] [stdout]    --> src/composites/mod.rs:357:13
[INFO] [stdout]     |
[INFO] [stdout] 8   | use std::i32;
[INFO] [stdout]     |     -------- the item `i32` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 357 |         use std::i32;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/container.rs:503:29
[INFO] [stdout]     |
[INFO] [stdout] 503 |     pub fn new(element: Box<Element>, alignment: PadAlignment, size: PadElementSize) -> Box<Self> {
[INFO] [stdout]     |                             ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/composites/mod.rs:415:41
[INFO] [stdout]     |
[INFO] [stdout] 415 |     pub fn push(&mut self, element: Box<Element>) {
[INFO] [stdout]     |                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `i32` is imported redundantly
[INFO] [stdout]    --> src/elements/basic.rs:139:13
[INFO] [stdout]     |
[INFO] [stdout] 7   | use elements::{*, action::*};
[INFO] [stdout]     |                - the item `i32` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 139 |         use std::i32;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:166:22
[INFO] [stdout]     |
[INFO] [stdout] 166 |     pub element: Box<Animateable>,
[INFO] [stdout]     |                      ^^^^^^^^^^^ help: use `dyn`: `dyn Animateable`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/composites/mod.rs:420:57
[INFO] [stdout]     |
[INFO] [stdout] 420 |     pub fn insert(&mut self, index: usize, element: Box<Element>) {
[INFO] [stdout]     |                                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/composites/mod.rs:432:41
[INFO] [stdout]     |
[INFO] [stdout] 432 |     pub fn pop(&mut self) -> Option<Box<Element>> {
[INFO] [stdout]     |                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:168:32
[INFO] [stdout]     |
[INFO] [stdout] 168 |     size_animation: Option<Box<SizeAnimation>>,
[INFO] [stdout]     |                                ^^^^^^^^^^^^^ help: use `dyn`: `dyn SizeAnimation`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:169:36
[INFO] [stdout]     |
[INFO] [stdout] 169 |     position_animation: Option<Box<PositionAnimation>>,
[INFO] [stdout]     |                                    ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn PositionAnimation`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/composites/mod.rs:438:51
[INFO] [stdout]     |
[INFO] [stdout] 438 |     pub fn remove(&mut self, index: usize) -> Box<Element> {
[INFO] [stdout]     |                                                   ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `i32` is imported redundantly
[INFO] [stdout]    --> src/composites/mod.rs:463:13
[INFO] [stdout]     |
[INFO] [stdout] 8   | use std::i32;
[INFO] [stdout]     |     -------- the item `i32` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 463 |         use std::i32;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:179:29
[INFO] [stdout]     |
[INFO] [stdout] 179 |     pub fn new(element: Box<Animateable>) -> Box<Self> {
[INFO] [stdout]     |                             ^^^^^^^^^^^ help: use `dyn`: `dyn Animateable`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `thread` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 39 | use std::thread;
[INFO] [stdout]    |     ----------- the item `thread` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 46 |         use std::thread;
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:200:57
[INFO] [stdout]     |
[INFO] [stdout] 200 |     pub fn with_size_animation(mut self, animation: Box<SizeAnimation>) -> Box<Self> {
[INFO] [stdout]     |                                                         ^^^^^^^^^^^^^ help: use `dyn`: `dyn SizeAnimation`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:205:61
[INFO] [stdout]     |
[INFO] [stdout] 205 |     pub fn with_position_animation(mut self, animation: Box<PositionAnimation>) -> Box<Self> {
[INFO] [stdout]     |                                                             ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn PositionAnimation`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:392:18
[INFO] [stdout]     |
[INFO] [stdout] 392 |     receive: Box<Fn(&mut E, ActionMsg)>,
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&mut E, ActionMsg)`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/action.rs:408:51
[INFO] [stdout]     |
[INFO] [stdout] 408 |     pub fn with_action_receive(mut self, fun: Box<Fn(&mut E, ActionMsg)>) -> Box<Self> {
[INFO] [stdout]     |                                                   ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&mut E, ActionMsg)`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/mod.rs:211:25
[INFO] [stdout]     |
[INFO] [stdout] 211 |     element: Option<Box<Element>>,
[INFO] [stdout]     |                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/elements/mod.rs:256:48
[INFO] [stdout]     |
[INFO] [stdout] 256 |     pub fn add_element(&mut self, element: Box<Element>) {
[INFO] [stdout]     |                                                ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/composites/mod.rs:330:23
[INFO] [stdout]     |
[INFO] [stdout] 330 |     elements: Vec<Box<Element>>,
[INFO] [stdout]     |                       ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `i32` is imported redundantly
[INFO] [stdout]    --> src/composites/mod.rs:357:13
[INFO] [stdout]     |
[INFO] [stdout] 8   | use std::i32;
[INFO] [stdout]     |     -------- the item `i32` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 357 |         use std::i32;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/composites/mod.rs:415:41
[INFO] [stdout]     |
[INFO] [stdout] 415 |     pub fn push(&mut self, element: Box<Element>) {
[INFO] [stdout]     |                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/composites/mod.rs:420:57
[INFO] [stdout]     |
[INFO] [stdout] 420 |     pub fn insert(&mut self, index: usize, element: Box<Element>) {
[INFO] [stdout]     |                                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/composites/mod.rs:432:41
[INFO] [stdout]     |
[INFO] [stdout] 432 |     pub fn pop(&mut self) -> Option<Box<Element>> {
[INFO] [stdout]     |                                         ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/composites/mod.rs:438:51
[INFO] [stdout]     |
[INFO] [stdout] 438 |     pub fn remove(&mut self, index: usize) -> Box<Element> {
[INFO] [stdout]     |                                                   ^^^^^^^ help: use `dyn`: `dyn Element`
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `i32` is imported redundantly
[INFO] [stdout]    --> src/composites/mod.rs:463:13
[INFO] [stdout]     |
[INFO] [stdout] 8   | use std::i32;
[INFO] [stdout]     |     -------- the item `i32` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 463 |         use std::i32;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `thread` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 39 | use std::thread;
[INFO] [stdout]    |     ----------- the item `thread` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 46 |         use std::thread;
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `use_extern_macros` has been stable since 1.30.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(use_extern_macros)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `duration_extras` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(duration_extras)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `use_extern_macros` has been stable since 1.30.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(use_extern_macros)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `duration_extras` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(duration_extras)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 36 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 36 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `duration_extras` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/bin.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(duration_extras)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `duration_extras` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/bin.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(duration_extras)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 24.23s
[INFO] running `Command { std: "docker" "inspect" "0859dfe13278e3f5e9cfdadac0cf230008158ac9791f7c9ec3eccc0b0cd711a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0859dfe13278e3f5e9cfdadac0cf230008158ac9791f7c9ec3eccc0b0cd711a0", kill_on_drop: false }`
[INFO] [stdout] 0859dfe13278e3f5e9cfdadac0cf230008158ac9791f7c9ec3eccc0b0cd711a0