[INFO] cloning repository https://github.com/dinowernli/marvin
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dinowernli/marvin" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdinowernli%2Fmarvin", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdinowernli%2Fmarvin'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 23542259fb7998ddf26a6c45d7c05debb18f204b
[INFO] testing dinowernli/marvin against beta-2022-02-22 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdinowernli%2Fmarvin" "/workspace/builds/worker-22/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-22/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dinowernli/marvin on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dinowernli/marvin
[INFO] finished tweaking git repo https://github.com/dinowernli/marvin
[INFO] tweaked toml for git repo https://github.com/dinowernli/marvin written to /workspace/builds/worker-22/source/Cargo.toml
[INFO] crate git repo https://github.com/dinowernli/marvin already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded winapi v0.2.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9d8af94ff2905f8502253d1ffa9ff637189547d551c4e4262c049688b26473c3
[INFO] running `Command { std: "docker" "start" "-a" "9d8af94ff2905f8502253d1ffa9ff637189547d551c4e4262c049688b26473c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9d8af94ff2905f8502253d1ffa9ff637189547d551c4e4262c049688b26473c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d8af94ff2905f8502253d1ffa9ff637189547d551c4e4262c049688b26473c3", kill_on_drop: false }`
[INFO] [stdout] 9d8af94ff2905f8502253d1ffa9ff637189547d551c4e4262c049688b26473c3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d0b73a7c866090f4bc94101582736a999476dd9db08c46870a5c74a039706fd0
[INFO] running `Command { std: "docker" "start" "-a" "d0b73a7c866090f4bc94101582736a999476dd9db08c46870a5c74a039706fd0", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.1.8
[INFO] [stderr]    Compiling winapi v0.2.4
[INFO] [stderr]    Compiling advapi32-sys v0.1.2
[INFO] [stderr]    Compiling log v0.3.2
[INFO] [stderr]    Compiling rand v0.3.11
[INFO] [stderr]    Compiling ai v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]   --> src/lib.rs:24:1
[INFO] [stdout]    |
[INFO] [stdout] 24 | #[macro_use] extern crate log;
[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/agent.rs:36:18
[INFO] [stdout]    |
[INFO] [stdout] 36 |   predictor: Box<Predictor>,
[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] 36 -   predictor: Box<Predictor>,
[INFO] [stdout] 36 +   predictor: Box<dyn Predictor>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/agent.rs:40:25
[INFO] [stdout]    |
[INFO] [stdout] 40 |   explorer_factory: Box<ExplorerFactory>,
[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] 40 -   explorer_factory: Box<ExplorerFactory>,
[INFO] [stdout] 40 +   explorer_factory: Box<dyn ExplorerFactory>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/environment/environment.rs:43:19
[INFO] [stdout]    |
[INFO] [stdout] 43 |   random: &'a mut Random,
[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] 43 -   random: &'a mut Random,
[INFO] [stdout] 43 +   random: &'a mut dyn Random,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/monte_carlo_explorer.rs:28:22
[INFO] [stdout]    |
[INFO] [stdout] 28 |   predictor: &'a mut Predictor,
[INFO] [stdout]    |                      ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 28 -   predictor: &'a mut Predictor,
[INFO] [stdout] 28 +   predictor: &'a mut dyn Predictor,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/random_explorer.rs:28:15
[INFO] [stdout]    |
[INFO] [stdout] 28 |   random: Box<Random>
[INFO] [stdout]    |               ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 28 -   random: Box<Random>
[INFO] [stdout] 28 +   random: Box<dyn Random>
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/agent.rs:56:22
[INFO] [stdout]    |
[INFO] [stdout] 56 |       predictor: Box<Predictor>,
[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] 56 -       predictor: Box<Predictor>,
[INFO] [stdout] 56 +       predictor: Box<dyn Predictor>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/agent.rs:57:29
[INFO] [stdout]    |
[INFO] [stdout] 57 |       explorer_factory: Box<ExplorerFactory>) -> Self {
[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] 57 -       explorer_factory: Box<ExplorerFactory>) -> Self {
[INFO] [stdout] 57 +       explorer_factory: Box<dyn ExplorerFactory>) -> Self {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/environment/environment.rs:54:30
[INFO] [stdout]    |
[INFO] [stdout] 54 |   pub fn new(random: &'a mut Random) -> CoinFlip<'a> {
[INFO] [stdout]    |                              ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 54 -   pub fn new(random: &'a mut Random) -> CoinFlip<'a> {
[INFO] [stdout] 54 +   pub fn new(random: &'a mut dyn Random) -> CoinFlip<'a> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:32:51
[INFO] [stdout]    |
[INFO] [stdout] 32 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 32 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stdout] 32 +       &self, predictor: &'a mut Predictor) -> Box<dyn Explorer + 'a>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:32:33
[INFO] [stdout]    |
[INFO] [stdout] 32 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stdout]    |                                 ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 32 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stdout] 32 +       &self, predictor: &'a mut dyn Predictor) -> Box<Explorer + 'a>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:34:21
[INFO] [stdout]    |
[INFO] [stdout] 34 |       &self) -> Box<Explorer>;
[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] 34 -       &self) -> Box<Explorer>;
[INFO] [stdout] 34 +       &self) -> Box<dyn Explorer>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:45:51
[INFO] [stdout]    |
[INFO] [stdout] 45 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 45 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stdout] 45 +       &self, predictor: &'a mut Predictor) -> Box<dyn Explorer + 'a> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:45:33
[INFO] [stdout]    |
[INFO] [stdout] 45 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stdout]    |                                 ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 45 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stdout] 45 +       &self, predictor: &'a mut dyn Predictor) -> Box<Explorer + 'a> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:49:43
[INFO] [stdout]    |
[INFO] [stdout] 49 |   fn create_random_explorer(&self) -> Box<Explorer> {
[INFO] [stdout]    |                                           ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 49 -   fn create_random_explorer(&self) -> Box<Explorer> {
[INFO] [stdout] 49 +   fn create_random_explorer(&self) -> Box<dyn Explorer> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/monte_carlo_explorer.rs:32:30
[INFO] [stdout]    |
[INFO] [stdout] 32 |   pub fn new(predictor: &mut Predictor) -> MonteCarloExplorer {
[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] 32 -   pub fn new(predictor: &mut Predictor) -> MonteCarloExplorer {
[INFO] [stdout] 32 +   pub fn new(predictor: &mut dyn Predictor) -> MonteCarloExplorer {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/random_explorer.rs:32:26
[INFO] [stdout]    |
[INFO] [stdout] 32 |   pub fn new(random: Box<Random>) -> RandomExplorer {
[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] 32 -   pub fn new(random: Box<Random>) -> RandomExplorer {
[INFO] [stdout] 32 +   pub fn new(random: Box<dyn Random>) -> RandomExplorer {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `predictor`
[INFO] [stdout]   --> src/explorer/monte_carlo_explorer.rs:28:3
[INFO] [stdout]    |
[INFO] [stdout] 28 |   predictor: &'a mut Predictor,
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.71s
[INFO] running `Command { std: "docker" "inspect" "d0b73a7c866090f4bc94101582736a999476dd9db08c46870a5c74a039706fd0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0b73a7c866090f4bc94101582736a999476dd9db08c46870a5c74a039706fd0", kill_on_drop: false }`
[INFO] [stdout] d0b73a7c866090f4bc94101582736a999476dd9db08c46870a5c74a039706fd0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e06ff0e748597f35e5054037509849de56238202618fd9759fd3648c6ceb1af7
[INFO] running `Command { std: "docker" "start" "-a" "e06ff0e748597f35e5054037509849de56238202618fd9759fd3648c6ceb1af7", kill_on_drop: false }`
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]   --> src/lib.rs:24:1
[INFO] [stdout]    |
[INFO] [stdout] 24 | #[macro_use] extern crate log;
[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/agent.rs:36:18
[INFO] [stdout]    |
[INFO] [stdout] 36 |   predictor: Box<Predictor>,
[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] 36 -   predictor: Box<Predictor>,
[INFO] [stdout] 36 +   predictor: Box<dyn Predictor>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/agent.rs:40:25
[INFO] [stdout]    |
[INFO] [stdout] 40 |   explorer_factory: Box<ExplorerFactory>,
[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] 40 -   explorer_factory: Box<ExplorerFactory>,
[INFO] [stdout] 40 +   explorer_factory: Box<dyn ExplorerFactory>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/environment/environment.rs:43:19
[INFO] [stdout]    |
[INFO] [stdout] 43 |   random: &'a mut Random,
[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] 43 -   random: &'a mut Random,
[INFO] [stdout] 43 +   random: &'a mut dyn Random,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/monte_carlo_explorer.rs:28:22
[INFO] [stdout]    |
[INFO] [stdout] 28 |   predictor: &'a mut Predictor,
[INFO] [stdout]    |                      ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 28 -   predictor: &'a mut Predictor,
[INFO] [stdout] 28 +   predictor: &'a mut dyn Predictor,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/random_explorer.rs:28:15
[INFO] [stdout]    |
[INFO] [stdout] 28 |   random: Box<Random>
[INFO] [stdout]    |               ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 28 -   random: Box<Random>
[INFO] [stdout] 28 +   random: Box<dyn Random>
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/agent.rs:56:22
[INFO] [stdout]    |
[INFO] [stdout] 56 |       predictor: Box<Predictor>,
[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] 56 -       predictor: Box<Predictor>,
[INFO] [stdout] 56 +       predictor: Box<dyn Predictor>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/agent.rs:57:29
[INFO] [stdout]    |
[INFO] [stdout] 57 |       explorer_factory: Box<ExplorerFactory>) -> Self {
[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] 57 -       explorer_factory: Box<ExplorerFactory>) -> Self {
[INFO] [stdout] 57 +       explorer_factory: Box<dyn ExplorerFactory>) -> Self {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/environment/environment.rs:54:30
[INFO] [stdout]    |
[INFO] [stdout] 54 |   pub fn new(random: &'a mut Random) -> CoinFlip<'a> {
[INFO] [stdout]    |                              ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 54 -   pub fn new(random: &'a mut Random) -> CoinFlip<'a> {
[INFO] [stdout] 54 +   pub fn new(random: &'a mut dyn Random) -> CoinFlip<'a> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:32:51
[INFO] [stdout]    |
[INFO] [stdout] 32 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 32 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stdout] 32 +       &self, predictor: &'a mut Predictor) -> Box<dyn Explorer + 'a>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:32:33
[INFO] [stdout]    |
[INFO] [stdout] 32 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stdout]    |                                 ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 32 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stdout] 32 +       &self, predictor: &'a mut dyn Predictor) -> Box<Explorer + 'a>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling ai v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:34:21
[INFO] [stdout]    |
[INFO] [stdout] 34 |       &self) -> Box<Explorer>;
[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] 34 -       &self) -> Box<Explorer>;
[INFO] [stdout] 34 +       &self) -> Box<dyn Explorer>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:45:51
[INFO] [stdout]    |
[INFO] [stdout] 45 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 45 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stdout] 45 +       &self, predictor: &'a mut Predictor) -> Box<dyn Explorer + 'a> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:45:33
[INFO] [stdout]    |
[INFO] [stdout] 45 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stdout]    |                                 ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 45 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stdout] 45 +       &self, predictor: &'a mut dyn Predictor) -> Box<Explorer + 'a> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:49:43
[INFO] [stdout]    |
[INFO] [stdout] 49 |   fn create_random_explorer(&self) -> Box<Explorer> {
[INFO] [stdout]    |                                           ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 49 -   fn create_random_explorer(&self) -> Box<Explorer> {
[INFO] [stdout] 49 +   fn create_random_explorer(&self) -> Box<dyn Explorer> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/monte_carlo_explorer.rs:32:30
[INFO] [stdout]    |
[INFO] [stdout] 32 |   pub fn new(predictor: &mut Predictor) -> MonteCarloExplorer {
[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] 32 -   pub fn new(predictor: &mut Predictor) -> MonteCarloExplorer {
[INFO] [stdout] 32 +   pub fn new(predictor: &mut dyn Predictor) -> MonteCarloExplorer {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/random_explorer.rs:32:26
[INFO] [stdout]    |
[INFO] [stdout] 32 |   pub fn new(random: Box<Random>) -> RandomExplorer {
[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] 32 -   pub fn new(random: Box<Random>) -> RandomExplorer {
[INFO] [stdout] 32 +   pub fn new(random: Box<dyn Random>) -> RandomExplorer {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `predictor`
[INFO] [stdout]   --> src/explorer/monte_carlo_explorer.rs:28:3
[INFO] [stdout]    |
[INFO] [stdout] 28 |   predictor: &'a mut Predictor,
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]   --> src/lib.rs:24:1
[INFO] [stdout]    |
[INFO] [stdout] 24 | #[macro_use] extern crate log;
[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/agent.rs:36:18
[INFO] [stdout]    |
[INFO] [stdout] 36 |   predictor: Box<Predictor>,
[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] 36 -   predictor: Box<Predictor>,
[INFO] [stdout] 36 +   predictor: Box<dyn Predictor>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/agent.rs:40:25
[INFO] [stdout]    |
[INFO] [stdout] 40 |   explorer_factory: Box<ExplorerFactory>,
[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] 40 -   explorer_factory: Box<ExplorerFactory>,
[INFO] [stdout] 40 +   explorer_factory: Box<dyn ExplorerFactory>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/environment/environment.rs:43:19
[INFO] [stdout]    |
[INFO] [stdout] 43 |   random: &'a mut Random,
[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] 43 -   random: &'a mut Random,
[INFO] [stdout] 43 +   random: &'a mut dyn Random,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/monte_carlo_explorer.rs:28:22
[INFO] [stdout]    |
[INFO] [stdout] 28 |   predictor: &'a mut Predictor,
[INFO] [stdout]    |                      ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 28 -   predictor: &'a mut Predictor,
[INFO] [stdout] 28 +   predictor: &'a mut dyn Predictor,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/random_explorer.rs:28:15
[INFO] [stdout]    |
[INFO] [stdout] 28 |   random: Box<Random>
[INFO] [stdout]    |               ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 28 -   random: Box<Random>
[INFO] [stdout] 28 +   random: Box<dyn Random>
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/agent.rs:56:22
[INFO] [stdout]    |
[INFO] [stdout] 56 |       predictor: Box<Predictor>,
[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] 56 -       predictor: Box<Predictor>,
[INFO] [stdout] 56 +       predictor: Box<dyn Predictor>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/agent.rs:57:29
[INFO] [stdout]    |
[INFO] [stdout] 57 |       explorer_factory: Box<ExplorerFactory>) -> Self {
[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] 57 -       explorer_factory: Box<ExplorerFactory>) -> Self {
[INFO] [stdout] 57 +       explorer_factory: Box<dyn ExplorerFactory>) -> Self {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/agent_test.rs:82:48
[INFO] [stdout]    |
[INFO] [stdout] 82 |       &self, predictor: &mut Predictor) -> Box<Explorer> {
[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] 82 -       &self, predictor: &mut Predictor) -> Box<Explorer> {
[INFO] [stdout] 82 +       &self, predictor: &mut Predictor) -> Box<dyn Explorer> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/agent_test.rs:82:30
[INFO] [stdout]    |
[INFO] [stdout] 82 |       &self, predictor: &mut Predictor) -> Box<Explorer> {
[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] 82 -       &self, predictor: &mut Predictor) -> Box<Explorer> {
[INFO] [stdout] 82 +       &self, predictor: &mut dyn Predictor) -> Box<Explorer> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/agent_test.rs:87:43
[INFO] [stdout]    |
[INFO] [stdout] 87 |   fn create_random_explorer(&self) -> Box<Explorer> {
[INFO] [stdout]    |                                           ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 87 -   fn create_random_explorer(&self) -> Box<Explorer> {
[INFO] [stdout] 87 +   fn create_random_explorer(&self) -> Box<dyn Explorer> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/environment/environment.rs:54:30
[INFO] [stdout]    |
[INFO] [stdout] 54 |   pub fn new(random: &'a mut Random) -> CoinFlip<'a> {
[INFO] [stdout]    |                              ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 54 -   pub fn new(random: &'a mut Random) -> CoinFlip<'a> {
[INFO] [stdout] 54 +   pub fn new(random: &'a mut dyn Random) -> CoinFlip<'a> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:32:51
[INFO] [stdout]    |
[INFO] [stdout] 32 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 32 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stdout] 32 +       &self, predictor: &'a mut Predictor) -> Box<dyn Explorer + 'a>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:32:33
[INFO] [stdout]    |
[INFO] [stdout] 32 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stdout]    |                                 ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 32 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stdout] 32 +       &self, predictor: &'a mut dyn Predictor) -> Box<Explorer + 'a>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:34:21
[INFO] [stdout]    |
[INFO] [stdout] 34 |       &self) -> Box<Explorer>;
[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] 34 -       &self) -> Box<Explorer>;
[INFO] [stdout] 34 +       &self) -> Box<dyn Explorer>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:45:51
[INFO] [stdout]    |
[INFO] [stdout] 45 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 45 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stdout] 45 +       &self, predictor: &'a mut Predictor) -> Box<dyn Explorer + 'a> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:45:33
[INFO] [stdout]    |
[INFO] [stdout] 45 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stdout]    |                                 ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 45 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stdout] 45 +       &self, predictor: &'a mut dyn Predictor) -> Box<Explorer + 'a> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/explorer_factory.rs:49:43
[INFO] [stdout]    |
[INFO] [stdout] 49 |   fn create_random_explorer(&self) -> Box<Explorer> {
[INFO] [stdout]    |                                           ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 49 -   fn create_random_explorer(&self) -> Box<Explorer> {
[INFO] [stdout] 49 +   fn create_random_explorer(&self) -> Box<dyn Explorer> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/monte_carlo_explorer.rs:32:30
[INFO] [stdout]    |
[INFO] [stdout] 32 |   pub fn new(predictor: &mut Predictor) -> MonteCarloExplorer {
[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] 32 -   pub fn new(predictor: &mut Predictor) -> MonteCarloExplorer {
[INFO] [stdout] 32 +   pub fn new(predictor: &mut dyn Predictor) -> MonteCarloExplorer {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/explorer/random_explorer.rs:32:26
[INFO] [stdout]    |
[INFO] [stdout] 32 |   pub fn new(random: Box<Random>) -> RandomExplorer {
[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] 32 -   pub fn new(random: Box<Random>) -> RandomExplorer {
[INFO] [stdout] 32 +   pub fn new(random: Box<dyn Random>) -> RandomExplorer {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `predictor`
[INFO] [stdout]   --> src/explorer/monte_carlo_explorer.rs:28:3
[INFO] [stdout]    |
[INFO] [stdout] 28 |   predictor: &'a mut Predictor,
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/predictor/context_tree_test.rs:123:38
[INFO] [stdout]     |
[INFO] [stdout] 123 |   assert!(-tol < diff && diff < tol, message);
[INFO] [stdout]     |                                      ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout]     = note: this usage of assert!() is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 123 |   assert!(-tol < diff && diff < tol, "{}", message);
[INFO] [stdout]     |                                      +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 22 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.62s
[INFO] running `Command { std: "docker" "inspect" "e06ff0e748597f35e5054037509849de56238202618fd9759fd3648c6ceb1af7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e06ff0e748597f35e5054037509849de56238202618fd9759fd3648c6ceb1af7", kill_on_drop: false }`
[INFO] [stdout] e06ff0e748597f35e5054037509849de56238202618fd9759fd3648c6ceb1af7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 260a0c72fb1b61af3e3b31e520265316affe20cce1bcd336737d1b073f32a61c
[INFO] running `Command { std: "docker" "start" "-a" "260a0c72fb1b61af3e3b31e520265316affe20cce1bcd336737d1b073f32a61c", kill_on_drop: false }`
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]   --> src/lib.rs:24:1
[INFO] [stderr]    |
[INFO] [stderr] 24 | #[macro_use] extern crate log;
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/agent.rs:36:18
[INFO] [stderr]    |
[INFO] [stderr] 36 |   predictor: Box<Predictor>,
[INFO] [stderr]    |                  ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 36 -   predictor: Box<Predictor>,
[INFO] [stderr] 36 +   predictor: Box<dyn Predictor>,
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/agent.rs:40:25
[INFO] [stderr]    |
[INFO] [stderr] 40 |   explorer_factory: Box<ExplorerFactory>,
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 40 -   explorer_factory: Box<ExplorerFactory>,
[INFO] [stderr] 40 +   explorer_factory: Box<dyn ExplorerFactory>,
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/environment/environment.rs:43:19
[INFO] [stderr]    |
[INFO] [stderr] 43 |   random: &'a mut Random,
[INFO] [stderr]    |                   ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 43 -   random: &'a mut Random,
[INFO] [stderr] 43 +   random: &'a mut dyn Random,
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/explorer/monte_carlo_explorer.rs:28:22
[INFO] [stderr]    |
[INFO] [stderr] 28 |   predictor: &'a mut Predictor,
[INFO] [stderr]    |                      ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 28 -   predictor: &'a mut Predictor,
[INFO] [stderr] 28 +   predictor: &'a mut dyn Predictor,
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/explorer/random_explorer.rs:28:15
[INFO] [stderr]    |
[INFO] [stderr] 28 |   random: Box<Random>
[INFO] [stderr]    |               ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 28 -   random: Box<Random>
[INFO] [stderr] 28 +   random: Box<dyn Random>
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/agent.rs:56:22
[INFO] [stderr]    |
[INFO] [stderr] 56 |       predictor: Box<Predictor>,
[INFO] [stderr]    |                      ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 56 -       predictor: Box<Predictor>,
[INFO] [stderr] 56 +       predictor: Box<dyn Predictor>,
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/agent.rs:57:29
[INFO] [stderr]    |
[INFO] [stderr] 57 |       explorer_factory: Box<ExplorerFactory>) -> Self {
[INFO] [stderr]    |                             ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 57 -       explorer_factory: Box<ExplorerFactory>) -> Self {
[INFO] [stderr] 57 +       explorer_factory: Box<dyn ExplorerFactory>) -> Self {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/environment/environment.rs:54:30
[INFO] [stderr]    |
[INFO] [stderr] 54 |   pub fn new(random: &'a mut Random) -> CoinFlip<'a> {
[INFO] [stderr]    |                              ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 54 -   pub fn new(random: &'a mut Random) -> CoinFlip<'a> {
[INFO] [stderr] 54 +   pub fn new(random: &'a mut dyn Random) -> CoinFlip<'a> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/explorer/explorer_factory.rs:32:51
[INFO] [stderr]    |
[INFO] [stderr] 32 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stderr]    |                                                   ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 32 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stderr] 32 +       &self, predictor: &'a mut Predictor) -> Box<dyn Explorer + 'a>;
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/explorer/explorer_factory.rs:32:33
[INFO] [stderr]    |
[INFO] [stderr] 32 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stderr]    |                                 ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 32 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a>;
[INFO] [stderr] 32 +       &self, predictor: &'a mut dyn Predictor) -> Box<Explorer + 'a>;
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/explorer/explorer_factory.rs:34:21
[INFO] [stderr]    |
[INFO] [stderr] 34 |       &self) -> Box<Explorer>;
[INFO] [stderr]    |                     ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 34 -       &self) -> Box<Explorer>;
[INFO] [stderr] 34 +       &self) -> Box<dyn Explorer>;
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/explorer/explorer_factory.rs:45:51
[INFO] [stderr]    |
[INFO] [stderr] 45 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stderr]    |                                                   ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 45 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stderr] 45 +       &self, predictor: &'a mut Predictor) -> Box<dyn Explorer + 'a> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/explorer/explorer_factory.rs:45:33
[INFO] [stderr]    |
[INFO] [stderr] 45 |       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stderr]    |                                 ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 45 -       &self, predictor: &'a mut Predictor) -> Box<Explorer + 'a> {
[INFO] [stderr] 45 +       &self, predictor: &'a mut dyn Predictor) -> Box<Explorer + 'a> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/explorer/explorer_factory.rs:49:43
[INFO] [stderr]    |
[INFO] [stderr] 49 |   fn create_random_explorer(&self) -> Box<Explorer> {
[INFO] [stderr]    |                                           ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 49 -   fn create_random_explorer(&self) -> Box<Explorer> {
[INFO] [stderr] 49 +   fn create_random_explorer(&self) -> Box<dyn Explorer> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/explorer/monte_carlo_explorer.rs:32:30
[INFO] [stderr]    |
[INFO] [stderr] 32 |   pub fn new(predictor: &mut Predictor) -> MonteCarloExplorer {
[INFO] [stderr]    |                              ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 32 -   pub fn new(predictor: &mut Predictor) -> MonteCarloExplorer {
[INFO] [stderr] 32 +   pub fn new(predictor: &mut dyn Predictor) -> MonteCarloExplorer {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/explorer/random_explorer.rs:32:26
[INFO] [stderr]    |
[INFO] [stderr] 32 |   pub fn new(random: Box<Random>) -> RandomExplorer {
[INFO] [stderr]    |                          ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 32 -   pub fn new(random: Box<Random>) -> RandomExplorer {
[INFO] [stderr] 32 +   pub fn new(random: Box<dyn Random>) -> RandomExplorer {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stderr] warning: field is never read: `predictor`
[INFO] [stdout] running 18 tests
[INFO] [stderr]   --> src/explorer/monte_carlo_explorer.rs:28:3
[INFO] [stdout] test bitstring_test::append ... ok
[INFO] [stderr]    |
[INFO] [stdout] test agent_test::age ... ok
[INFO] [stderr] 28 |   predictor: &'a mut Predictor,
[INFO] [stdout] test agent_test::reward ... ok
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] test bitstring_test::empty ... ok
[INFO] [stderr]    |
[INFO] [stdout] test bitstring_test::from_string ... ok
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] test bitstring_test::from_u64 ... ok
[INFO] [stderr] 
[INFO] [stdout] test bitstring_test::size ... ok
[INFO] [stderr] warning: `ai` (lib) generated 18 warnings
[INFO] [stdout] test bitstring_test::zero ... ok
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout] test predictor::context_tree_test::empty_size ... ok
[INFO] [stderr]   --> src/agent_test.rs:82:48
[INFO] [stdout] test explorer::random_explorer_test::explore ... ok
[INFO] [stderr]    |
[INFO] [stdout] test predictor::context_tree_test::predict_uniform ... ok
[INFO] [stderr] 82 |       &self, predictor: &mut Predictor) -> Box<Explorer> {
[INFO] [stdout] test predictor::context_tree_test::noop_revert_is_valid ... ok
[INFO] [stderr]    |                                                ^^^^^^^^
[INFO] [stdout] test predictor::context_tree_test::predict_empty ... ok
[INFO] [stderr]    |
[INFO] [stdout] test predictor::context_tree_test::predict_with_history ... ok
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout] test predictor::context_tree_test::revert_restores_size ... ok
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] test predictor::context_tree_test::size ... ok
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 82 -       &self, predictor: &mut Predictor) -> Box<Explorer> {
[INFO] [stderr] 82 +       &self, predictor: &mut Predictor) -> Box<dyn Explorer> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/agent_test.rs:82:30
[INFO] [stderr]    |
[INFO] [stderr] 82 |       &self, predictor: &mut Predictor) -> Box<Explorer> {
[INFO] [stderr]    |                              ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 82 -       &self, predictor: &mut Predictor) -> Box<Explorer> {
[INFO] [stderr] 82 +       &self, predictor: &mut dyn Predictor) -> Box<Explorer> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/agent_test.rs:87:43
[INFO] [stderr]    |
[INFO] [stderr] 87 |   fn create_random_explorer(&self) -> Box<Explorer> {
[INFO] [stderr]    |                                           ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 87 -   fn create_random_explorer(&self) -> Box<Explorer> {
[INFO] [stderr] 87 +   fn create_random_explorer(&self) -> Box<dyn Explorer> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: panic message is not a string literal
[INFO] [stderr]    --> src/predictor/context_tree_test.rs:123:38
[INFO] [stderr]     |
[INFO] [stderr] 123 |   assert!(-tol < diff && diff < tol, message);
[INFO] [stderr]     |                                      ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stderr]     = note: this usage of assert!() is deprecated; it will be a hard error in Rust 2021
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stderr] help: add a "{}" format string to Display the message
[INFO] [stderr]     |
[INFO] [stderr] 123 |   assert!(-tol < diff && diff < tol, "{}", message);
[INFO] [stderr]     |                                      +++++
[INFO] [stderr] 
[INFO] [stderr] warning: `ai` (lib test) generated 22 warnings (18 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/ai-0beee1b5690a7afa)
[INFO] [stdout] test predictor::context_tree_test::revert_restores_state ... ok
[INFO] [stdout] test predictor::context_tree_test::invalid_revert - should panic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 18 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/ai-0d632cab30e9c2bd)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests ai
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "260a0c72fb1b61af3e3b31e520265316affe20cce1bcd336737d1b073f32a61c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "260a0c72fb1b61af3e3b31e520265316affe20cce1bcd336737d1b073f32a61c", kill_on_drop: false }`
[INFO] [stdout] 260a0c72fb1b61af3e3b31e520265316affe20cce1bcd336737d1b073f32a61c