[INFO] fetching crate easy-jsonrpc 0.5.3...
[INFO] checking easy-jsonrpc-0.5.3 against beta-2021-10-15 for beta-1.56-3
[INFO] extracting crate easy-jsonrpc 0.5.3 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate easy-jsonrpc 0.5.3 on toolchain beta-2021-10-15
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-10-15" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate easy-jsonrpc 0.5.3
[INFO] finished tweaking crates.io crate easy-jsonrpc 0.5.3
[INFO] tweaked toml for crates.io crate easy-jsonrpc 0.5.3 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate easy-jsonrpc 0.5.3 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-10-15" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-10-15" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c5163ac297b8a44bdd55e6ab4e50df083255559c2e6decbc5e443cc978f1dbc3
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c5163ac297b8a44bdd55e6ab4e50df083255559c2e6decbc5e443cc978f1dbc3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c5163ac297b8a44bdd55e6ab4e50df083255559c2e6decbc5e443cc978f1dbc3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c5163ac297b8a44bdd55e6ab4e50df083255559c2e6decbc5e443cc978f1dbc3", kill_on_drop: false }`
[INFO] [stdout] c5163ac297b8a44bdd55e6ab4e50df083255559c2e6decbc5e443cc978f1dbc3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-10-15" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b2ad4a2dcdb67d9e3f24abefa16b7b7e9eee9e485bcb945ab250b41d21c620e8
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b2ad4a2dcdb67d9e3f24abefa16b7b7e9eee9e485bcb945ab250b41d21c620e8", kill_on_drop: false }`
[INFO] [stderr]    Compiling openssl v0.10.25
[INFO] [stderr]    Compiling unicode-segmentation v1.3.0
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[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `dyn FrobMachine`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `dyn FrobMachine`
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `<dyn FrobMachine>`
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `dyn FrobMachine`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `dyn FrobMachine`
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `<dyn FrobMachine>`
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `dyn FrobMachine`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `dyn FrobMachine`
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `dyn FrobMachine`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `dyn FrobMachine`
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `dyn FrobMachine`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `dyn FrobMachine`
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `<dyn FrobMachine>`
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `<dyn FrobMachine>`
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:676:15
[INFO] [stdout]     |
[INFO] [stdout] 676 |     pub trait Adder {
[INFO] [stdout]     |               ^^^^^ help: use `dyn`: `dyn Adder`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:676:15
[INFO] [stdout]     |
[INFO] [stdout] 676 |     pub trait Adder {
[INFO] [stdout]     |               ^^^^^ help: use `dyn`: `dyn Adder`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]     --> src/lib.rs:1041:15
[INFO] [stdout]      |
[INFO] [stdout] 1041 |         trait Adder {
[INFO] [stdout]      |               ^^^^^ help: use `dyn`: `dyn Adder`
[INFO] [stdout]      |
[INFO] [stdout]      = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]      = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]     --> src/lib.rs:1094:15
[INFO] [stdout]      |
[INFO] [stdout] 1094 |         trait Adder {
[INFO] [stdout]      |               ^^^^^ help: use `dyn`: `dyn Adder`
[INFO] [stdout]      |
[INFO] [stdout]      = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]      = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]     --> src/lib.rs:1170:15
[INFO] [stdout]      |
[INFO] [stdout] 1170 |         trait Bar {
[INFO] [stdout]      |               ^^^ help: use `dyn`: `dyn Bar`
[INFO] [stdout]      |
[INFO] [stdout]      = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]      = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `<dyn FrobMachine>`
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `dyn FrobMachine`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `dyn FrobMachine`
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/common/mod.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub trait FrobMachine: Sync + Send {
[INFO] [stdout]   |           ^^^^^^^^^^^ help: use `dyn`: `<dyn FrobMachine>`
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:676:15
[INFO] [stdout]     |
[INFO] [stdout] 676 |     pub trait Adder {
[INFO] [stdout]     |               ^^^^^ help: use `dyn`: `<dyn Adder>`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]     --> src/lib.rs:1041:15
[INFO] [stdout]      |
[INFO] [stdout] 1041 |         trait Adder {
[INFO] [stdout]      |               ^^^^^ help: use `dyn`: `<dyn Adder>`
[INFO] [stdout]      |
[INFO] [stdout]      = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]      = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]     --> src/lib.rs:1094:15
[INFO] [stdout]      |
[INFO] [stdout] 1094 |         trait Adder {
[INFO] [stdout]      |               ^^^^^ help: use `dyn`: `<dyn Adder>`
[INFO] [stdout]      |
[INFO] [stdout]      = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]      = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]     --> src/lib.rs:1170:15
[INFO] [stdout]      |
[INFO] [stdout] 1170 |         trait Bar {
[INFO] [stdout]      |               ^^^ help: use `dyn`: `<dyn Bar>`
[INFO] [stdout]      |
[INFO] [stdout]      = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]      = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 42.98s
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "b2ad4a2dcdb67d9e3f24abefa16b7b7e9eee9e485bcb945ab250b41d21c620e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2ad4a2dcdb67d9e3f24abefa16b7b7e9eee9e485bcb945ab250b41d21c620e8", kill_on_drop: false }`
[INFO] [stdout] b2ad4a2dcdb67d9e3f24abefa16b7b7e9eee9e485bcb945ab250b41d21c620e8
