[INFO] fetching crate data_tracker 0.1.0...
[INFO] testing data_tracker-0.1.0 against 1.60.0 for beta-1.61-1
[INFO] extracting crate data_tracker 0.1.0 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate data_tracker 0.1.0 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate data_tracker 0.1.0
[INFO] finished tweaking crates.io crate data_tracker 0.1.0
[INFO] tweaked toml for crates.io crate data_tracker 0.1.0 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ca8028efeac32272dc3509c1a2479eab21561a4213fe17675831717c5e2a0418
[INFO] running `Command { std: "docker" "start" "-a" "ca8028efeac32272dc3509c1a2479eab21561a4213fe17675831717c5e2a0418", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ca8028efeac32272dc3509c1a2479eab21561a4213fe17675831717c5e2a0418", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca8028efeac32272dc3509c1a2479eab21561a4213fe17675831717c5e2a0418", kill_on_drop: false }`
[INFO] [stdout] ca8028efeac32272dc3509c1a2479eab21561a4213fe17675831717c5e2a0418
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] cdf477225ebe08916be53b80a4bf58aad29bfc763425dfc25ded40b1d37efe56
[INFO] running `Command { std: "docker" "start" "-a" "cdf477225ebe08916be53b80a4bf58aad29bfc763425dfc25ded40b1d37efe56", kill_on_drop: false }`
[INFO] [stderr]    Compiling data_tracker v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:114:28
[INFO] [stdout]     |
[INFO] [stdout] 114 |     fn_map: HashMap<K, Box<OnChanged<T>>>,
[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] 114 -     fn_map: HashMap<K, Box<OnChanged<T>>>,
[INFO] [stdout] 114 +     fn_map: HashMap<K, Box<dyn OnChanged<T>>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:121:76
[INFO] [stdout]     |
[INFO] [stdout] 121 |     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<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] 121 -     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<T>>> {
[INFO] [stdout] 121 +     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:121:47
[INFO] [stdout]     |
[INFO] [stdout] 121 |     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<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] 121 -     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<T>>> {
[INFO] [stdout] 121 +     fn add_listener(&mut self, key: K, f: Box<dyn OnChanged<T>>) -> Option<Box<OnChanged<T>>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:124:58
[INFO] [stdout]     |
[INFO] [stdout] 124 |     fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<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] 124 -     fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<T>>> {
[INFO] [stdout] 124 +     fn remove_listener(&mut self, key: &K) -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:230:39
[INFO] [stdout]     |
[INFO] [stdout] 230 |                         -> Option<Box<OnChanged<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] 230 -                         -> Option<Box<OnChanged<T>>> {
[INFO] [stdout] 230 +                         -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:229:39
[INFO] [stdout]     |
[INFO] [stdout] 229 |                         callback: Box<OnChanged<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] 229 -                         callback: Box<OnChanged<T>>)
[INFO] [stdout] 229 +                         callback: Box<dyn OnChanged<T>>)
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:238:62
[INFO] [stdout]     |
[INFO] [stdout] 238 |     pub fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<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] 238 -     pub fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<T>>> {
[INFO] [stdout] 238 +     pub fn remove_listener(&mut self, key: &K) -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.43s
[INFO] running `Command { std: "docker" "inspect" "cdf477225ebe08916be53b80a4bf58aad29bfc763425dfc25ded40b1d37efe56", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cdf477225ebe08916be53b80a4bf58aad29bfc763425dfc25ded40b1d37efe56", kill_on_drop: false }`
[INFO] [stdout] cdf477225ebe08916be53b80a4bf58aad29bfc763425dfc25ded40b1d37efe56
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ca64d41abfb8dd7c0551547b8177d6aaaf439d9b74330317373a2030e2dd5e06
[INFO] running `Command { std: "docker" "start" "-a" "ca64d41abfb8dd7c0551547b8177d6aaaf439d9b74330317373a2030e2dd5e06", kill_on_drop: false }`
[INFO] [stderr]    Compiling data_tracker v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:114:28
[INFO] [stdout]     |
[INFO] [stdout] 114 |     fn_map: HashMap<K, Box<OnChanged<T>>>,
[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] 114 -     fn_map: HashMap<K, Box<OnChanged<T>>>,
[INFO] [stdout] 114 +     fn_map: HashMap<K, Box<dyn OnChanged<T>>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:121:76
[INFO] [stdout]     |
[INFO] [stdout] 121 |     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<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] 121 -     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<T>>> {
[INFO] [stdout] 121 +     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:121:47
[INFO] [stdout]     |
[INFO] [stdout] 121 |     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<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] 121 -     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<T>>> {
[INFO] [stdout] 121 +     fn add_listener(&mut self, key: K, f: Box<dyn OnChanged<T>>) -> Option<Box<OnChanged<T>>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:124:58
[INFO] [stdout]     |
[INFO] [stdout] 124 |     fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<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] 124 -     fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<T>>> {
[INFO] [stdout] 124 +     fn remove_listener(&mut self, key: &K) -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:230:39
[INFO] [stdout]     |
[INFO] [stdout] 230 |                         -> Option<Box<OnChanged<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] 230 -                         -> Option<Box<OnChanged<T>>> {
[INFO] [stdout] 230 +                         -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:229:39
[INFO] [stdout]     |
[INFO] [stdout] 229 |                         callback: Box<OnChanged<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] 229 -                         callback: Box<OnChanged<T>>)
[INFO] [stdout] 229 +                         callback: Box<dyn OnChanged<T>>)
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:238:62
[INFO] [stdout]     |
[INFO] [stdout] 238 |     pub fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<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] 238 -     pub fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<T>>> {
[INFO] [stdout] 238 +     pub fn remove_listener(&mut self, key: &K) -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:114:28
[INFO] [stdout]     |
[INFO] [stdout] 114 |     fn_map: HashMap<K, Box<OnChanged<T>>>,
[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] 114 -     fn_map: HashMap<K, Box<OnChanged<T>>>,
[INFO] [stdout] 114 +     fn_map: HashMap<K, Box<dyn OnChanged<T>>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:121:76
[INFO] [stdout]     |
[INFO] [stdout] 121 |     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<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] 121 -     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<T>>> {
[INFO] [stdout] 121 +     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:121:47
[INFO] [stdout]     |
[INFO] [stdout] 121 |     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<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] 121 -     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<T>>> {
[INFO] [stdout] 121 +     fn add_listener(&mut self, key: K, f: Box<dyn OnChanged<T>>) -> Option<Box<OnChanged<T>>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:124:58
[INFO] [stdout]     |
[INFO] [stdout] 124 |     fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<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] 124 -     fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<T>>> {
[INFO] [stdout] 124 +     fn remove_listener(&mut self, key: &K) -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:230:39
[INFO] [stdout]     |
[INFO] [stdout] 230 |                         -> Option<Box<OnChanged<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] 230 -                         -> Option<Box<OnChanged<T>>> {
[INFO] [stdout] 230 +                         -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:229:39
[INFO] [stdout]     |
[INFO] [stdout] 229 |                         callback: Box<OnChanged<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] 229 -                         callback: Box<OnChanged<T>>)
[INFO] [stdout] 229 +                         callback: Box<dyn OnChanged<T>>)
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:238:62
[INFO] [stdout]     |
[INFO] [stdout] 238 |     pub fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<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] 238 -     pub fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<T>>> {
[INFO] [stdout] 238 +     pub fn remove_listener(&mut self, key: &K) -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.65s
[INFO] running `Command { std: "docker" "inspect" "ca64d41abfb8dd7c0551547b8177d6aaaf439d9b74330317373a2030e2dd5e06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca64d41abfb8dd7c0551547b8177d6aaaf439d9b74330317373a2030e2dd5e06", kill_on_drop: false }`
[INFO] [stdout] ca64d41abfb8dd7c0551547b8177d6aaaf439d9b74330317373a2030e2dd5e06
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 39911d31fb7a7f58b58e07e3a96d85d59686152ff32e67798aa0614f330fe2c9
[INFO] running `Command { std: "docker" "start" "-a" "39911d31fb7a7f58b58e07e3a96d85d59686152ff32e67798aa0614f330fe2c9", kill_on_drop: false }`
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:114:28
[INFO] [stderr]     |
[INFO] [stderr] 114 |     fn_map: HashMap<K, Box<OnChanged<T>>>,
[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] 114 -     fn_map: HashMap<K, Box<OnChanged<T>>>,
[INFO] [stderr] 114 +     fn_map: HashMap<K, Box<dyn OnChanged<T>>>,
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:121:76
[INFO] [stderr]     |
[INFO] [stderr] 121 |     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<T>>> {
[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] 121 -     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<T>>> {
[INFO] [stderr] 121 +     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:121:47
[INFO] [stderr]     |
[INFO] [stderr] 121 |     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<T>>> {
[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] 121 -     fn add_listener(&mut self, key: K, f: Box<OnChanged<T>>) -> Option<Box<OnChanged<T>>> {
[INFO] [stderr] 121 +     fn add_listener(&mut self, key: K, f: Box<dyn OnChanged<T>>) -> Option<Box<OnChanged<T>>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:124:58
[INFO] [stderr]     |
[INFO] [stderr] 124 |     fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<T>>> {
[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] 124 -     fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<T>>> {
[INFO] [stderr] 124 +     fn remove_listener(&mut self, key: &K) -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:230:39
[INFO] [stderr]     |
[INFO] [stderr] 230 |                         -> Option<Box<OnChanged<T>>> {
[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] 230 -                         -> Option<Box<OnChanged<T>>> {
[INFO] [stderr] 230 +                         -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:229:39
[INFO] [stderr]     |
[INFO] [stderr] 229 |                         callback: Box<OnChanged<T>>)
[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] 229 -                         callback: Box<OnChanged<T>>)
[INFO] [stderr] 229 +                         callback: Box<dyn OnChanged<T>>)
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:238:62
[INFO] [stderr]     |
[INFO] [stderr] 238 |     pub fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<T>>> {
[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] 238 -     pub fn remove_listener(&mut self, key: &K) -> Option<Box<OnChanged<T>>> {
[INFO] [stderr] 238 +     pub fn remove_listener(&mut self, key: &K) -> Option<Box<dyn OnChanged<T>>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: `data_tracker` (lib) generated 7 warnings
[INFO] [stderr] warning: `data_tracker` (lib test) generated 7 warnings (7 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/data_tracker-c0f115804914707a)
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests data_tracker
[INFO] [stdout] running 4 tests
[INFO] [stdout] test tests::callback_arg_order ... ok
[INFO] [stdout] test tests::track_enum ... ok
[INFO] [stdout] test tests::track_send_impl ... ok
[INFO] [stdout] test tests::track_struct ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - (line 33) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.86s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "39911d31fb7a7f58b58e07e3a96d85d59686152ff32e67798aa0614f330fe2c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39911d31fb7a7f58b58e07e3a96d85d59686152ff32e67798aa0614f330fe2c9", kill_on_drop: false }`
[INFO] [stdout] 39911d31fb7a7f58b58e07e3a96d85d59686152ff32e67798aa0614f330fe2c9