[INFO] cloning repository https://github.com/jamii/rust-tagless
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jamii/rust-tagless" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjamii%2Frust-tagless", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjamii%2Frust-tagless'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f0d27595de7b911fd06e2572f1049225a2ac9193
[INFO] testing jamii/rust-tagless against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjamii%2Frust-tagless" "/workspace/builds/worker-119/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-119/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jamii/rust-tagless on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jamii/rust-tagless
[INFO] finished tweaking git repo https://github.com/jamii/rust-tagless
[INFO] tweaked toml for git repo https://github.com/jamii/rust-tagless written to /workspace/builds/worker-119/source/Cargo.toml
[INFO] crate git repo https://github.com/jamii/rust-tagless already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-119/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-119/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] adc5f48db33f820ec9ee71db8073b60ceba7872880faf9843812f87c4a1d45fd
[INFO] running `Command { std: "docker" "start" "-a" "adc5f48db33f820ec9ee71db8073b60ceba7872880faf9843812f87c4a1d45fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "adc5f48db33f820ec9ee71db8073b60ceba7872880faf9843812f87c4a1d45fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "adc5f48db33f820ec9ee71db8073b60ceba7872880faf9843812f87c4a1d45fd", kill_on_drop: false }`
[INFO] [stdout] adc5f48db33f820ec9ee71db8073b60ceba7872880faf9843812f87c4a1d45fd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-119/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-119/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6151bccdee7ed85d7aeb37134e1eb8f6470da74429c04c0912443f40150c76b3
[INFO] running `Command { std: "docker" "start" "-a" "6151bccdee7ed85d7aeb37134e1eb8f6470da74429c04c0912443f40150c76b3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling tagless v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(box_syntax)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(box_patterns)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: denote infinite loops with `loop { ... }`
[INFO] [stdout]   --> src/main.rs:97:13
[INFO] [stdout]    |
[INFO] [stdout] 97 |             while true {
[INFO] [stdout]    |             ^^^^^^^^^^ help: use `loop`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(while_true)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:118:16
[INFO] [stdout]     |
[INFO] [stdout] 118 |     Number(Box<Fn() -> i64>),
[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] 118 -     Number(Box<Fn() -> i64>),
[INFO] [stdout] 118 +     Number(Box<dyn Fn() -> i64>),
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:119:14
[INFO] [stdout]     |
[INFO] [stdout] 119 |     Bool(Box<Fn() -> bool>),
[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] 119 -     Bool(Box<Fn() -> bool>),
[INFO] [stdout] 119 +     Bool(Box<dyn Fn() -> bool>),
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:254:16
[INFO] [stdout]     |
[INFO] [stdout] 254 |     value: Box<Any>,
[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] 254 -     value: Box<Any>,
[INFO] [stdout] 254 +     value: Box<dyn Any>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:298:16
[INFO] [stdout]     |
[INFO] [stdout] 298 |     expr1: Box<Runnable<Output = i64>>,
[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] 298 -     expr1: Box<Runnable<Output = i64>>,
[INFO] [stdout] 298 +     expr1: Box<dyn Runnable<Output = i64>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:299:16
[INFO] [stdout]     |
[INFO] [stdout] 299 |     expr2: Box<Runnable<Output = i64>>,
[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] 299 -     expr2: Box<Runnable<Output = i64>>,
[INFO] [stdout] 299 +     expr2: Box<dyn Runnable<Output = i64>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:310:16
[INFO] [stdout]     |
[INFO] [stdout] 310 |     expr1: Box<Runnable<Output = i64>>,
[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] 310 -     expr1: Box<Runnable<Output = i64>>,
[INFO] [stdout] 310 +     expr1: Box<dyn Runnable<Output = i64>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:311:16
[INFO] [stdout]     |
[INFO] [stdout] 311 |     expr2: Box<Runnable<Output = i64>>,
[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] 311 -     expr2: Box<Runnable<Output = i64>>,
[INFO] [stdout] 311 +     expr2: Box<dyn Runnable<Output = i64>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:323:16
[INFO] [stdout]     |
[INFO] [stdout] 323 |     expr1: Box<Runnable<Output = T1>>,
[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] 323 -     expr1: Box<Runnable<Output = T1>>,
[INFO] [stdout] 323 +     expr1: Box<dyn Runnable<Output = T1>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:324:16
[INFO] [stdout]     |
[INFO] [stdout] 324 |     expr2: Box<Runnable<Output = T2>>,
[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] 324 -     expr2: Box<Runnable<Output = T2>>,
[INFO] [stdout] 324 +     expr2: Box<dyn Runnable<Output = T2>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:354:15
[INFO] [stdout]     |
[INFO] [stdout] 354 |     expr: Box<Runnable<Output = T>>,
[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] 354 -     expr: Box<Runnable<Output = T>>,
[INFO] [stdout] 354 +     expr: Box<dyn Runnable<Output = T>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:370:16
[INFO] [stdout]     |
[INFO] [stdout] 370 |     expr1: Box<Runnable<Output = bool>>,
[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] 370 -     expr1: Box<Runnable<Output = bool>>,
[INFO] [stdout] 370 +     expr1: Box<dyn Runnable<Output = bool>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:371:16
[INFO] [stdout]     |
[INFO] [stdout] 371 |     expr2: Box<Runnable<Output = T>>,
[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] 371 -     expr2: Box<Runnable<Output = T>>,
[INFO] [stdout] 371 +     expr2: Box<dyn Runnable<Output = T>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:385:16
[INFO] [stdout]     |
[INFO] [stdout] 385 |     value: Box<Any>,
[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] 385 -     value: Box<Any>,
[INFO] [stdout] 385 +     value: Box<dyn Any>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:268:31
[INFO] [stdout]     |
[INFO] [stdout] 268 |     fn unwrap<T>(self) -> Box<Fn() -> T + 'static>
[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] 268 -     fn unwrap<T>(self) -> Box<Fn() -> T + 'static>
[INFO] [stdout] 268 +     fn unwrap<T>(self) -> Box<dyn Fn() -> T + 'static>
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:399:31
[INFO] [stdout]     |
[INFO] [stdout] 399 |     fn unwrap<T>(self) -> Box<Runnable<Output = T>>
[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] 399 -     fn unwrap<T>(self) -> Box<Runnable<Output = T>>
[INFO] [stdout] 399 +     fn unwrap<T>(self) -> Box<dyn Runnable<Output = T>>
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:149:33
[INFO] [stdout]     |
[INFO] [stdout] 149 |             let staged_let: Box<Fn()> = match typ {
[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] 149 -             let staged_let: Box<Fn()> = match typ {
[INFO] [stdout] 149 +             let staged_let: Box<dyn Fn()> = match typ {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:264:23
[INFO] [stdout]     |
[INFO] [stdout] 264 |         let box2: Box<Any> = box box1 as Box<Any>;
[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] 264 -         let box2: Box<Any> = box box1 as Box<Any>;
[INFO] [stdout] 264 +         let box2: Box<dyn Any> = box box1 as Box<Any>;
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:264:46
[INFO] [stdout]     |
[INFO] [stdout] 264 |         let box2: Box<Any> = box box1 as Box<Any>;
[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] 264 -         let box2: Box<Any> = box box1 as Box<Any>;
[INFO] [stdout] 264 +         let box2: Box<Any> = box box1 as Box<dyn Any>;
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:394:23
[INFO] [stdout]     |
[INFO] [stdout] 394 |         let box1: Box<Runnable<Output = T>> = box runnable;
[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] 394 -         let box1: Box<Runnable<Output = T>> = box runnable;
[INFO] [stdout] 394 +         let box1: Box<dyn Runnable<Output = T>> = box runnable;
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:395:23
[INFO] [stdout]     |
[INFO] [stdout] 395 |         let box2: Box<Any> = box box1 as Box<Any>;
[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] 395 -         let box2: Box<Any> = box box1 as Box<Any>;
[INFO] [stdout] 395 +         let box2: Box<dyn Any> = box box1 as Box<Any>;
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:395:46
[INFO] [stdout]     |
[INFO] [stdout] 395 |         let box2: Box<Any> = box box1 as Box<Any>;
[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] 395 -         let box2: Box<Any> = box box1 as Box<Any>;
[INFO] [stdout] 395 +         let box2: Box<Any> = box box1 as Box<dyn Any>;
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 22 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tagless` due to 3 previous errors; 22 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "6151bccdee7ed85d7aeb37134e1eb8f6470da74429c04c0912443f40150c76b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6151bccdee7ed85d7aeb37134e1eb8f6470da74429c04c0912443f40150c76b3", kill_on_drop: false }`
[INFO] [stdout] 6151bccdee7ed85d7aeb37134e1eb8f6470da74429c04c0912443f40150c76b3