[INFO] cloning repository https://github.com/portal-co/embedded-packet-io
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/portal-co/embedded-packet-io" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fportal-co%2Fembedded-packet-io", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fportal-co%2Fembedded-packet-io'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3149c074ec42175eb8968fac1c3ce55533ab3348
[INFO] testing portal-co/embedded-packet-io against try#b83b707f97d809763b7861afa7638871f3339a33 for pr-145838-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fportal-co%2Fembedded-packet-io" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/portal-co/embedded-packet-io
[INFO] finished tweaking git repo https://github.com/portal-co/embedded-packet-io
[INFO] tweaked toml for git repo https://github.com/portal-co/embedded-packet-io written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/portal-co/embedded-packet-io on toolchain b83b707f97d809763b7861afa7638871f3339a33
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/portal-co/embedded-packet-io already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 18685a81f40d9a777490a005f25e3fbfd726a78d72e5b4fab203473451f48137
[INFO] running `Command { std: "docker" "start" "-a" "18685a81f40d9a777490a005f25e3fbfd726a78d72e5b4fab203473451f48137", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "18685a81f40d9a777490a005f25e3fbfd726a78d72e5b4fab203473451f48137", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18685a81f40d9a777490a005f25e3fbfd726a78d72e5b4fab203473451f48137", kill_on_drop: false }`
[INFO] [stdout] 18685a81f40d9a777490a005f25e3fbfd726a78d72e5b4fab203473451f48137
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 510563c789d624904e388cf7a4493ae1fd3dfbbfac301886829681b22ca68f91
[INFO] running `Command { std: "docker" "start" "-a" "510563c789d624904e388cf7a4493ae1fd3dfbbfac301886829681b22ca68f91", kill_on_drop: false }`
[INFO] [stderr]    Compiling byteorder v1.5.0
[INFO] [stderr]    Compiling heapless v0.8.0
[INFO] [stderr]    Compiling embedded-io-async v0.6.1
[INFO] [stderr]    Compiling stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling embedded-io v0.6.1
[INFO] [stderr]    Compiling hash32 v0.3.1
[INFO] [stderr]    Compiling embedded-packet-io v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of `async fn` in public traits is discouraged as auto trait bounds cannot be specified
[INFO] [stdout]  --> src/lib.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     async fn read_packet(&mut self) -> Result<heapless::Vec<u8, N>, Self::Error>;
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: you can suppress this lint if you plan to use the trait only in your own code, or do not care about auto traits like `Send` on the `Future`
[INFO] [stdout]   = note: `#[warn(async_fn_in_trait)]` on by default
[INFO] [stdout] help: you can alternatively desugar to a normal `fn` that returns `impl Future` and add any desired bounds such as `Send`, but these cannot be relaxed without a breaking API change
[INFO] [stdout]   |
[INFO] [stdout] 8 -     async fn read_packet(&mut self) -> Result<heapless::Vec<u8, N>, Self::Error>;
[INFO] [stdout] 8 +     fn read_packet(&mut self) -> impl std::future::Future<Output = Result<heapless::Vec<u8, N>, Self::Error>> + Send;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of `async fn` in public traits is discouraged as auto trait bounds cannot be specified
[INFO] [stdout]   --> src/lib.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     async fn write_packet(&mut self, x: heapless::Vec<u8,N>) -> Result<(),Self::Error>;
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: you can suppress this lint if you plan to use the trait only in your own code, or do not care about auto traits like `Send` on the `Future`
[INFO] [stdout] help: you can alternatively desugar to a normal `fn` that returns `impl Future` and add any desired bounds such as `Send`, but these cannot be relaxed without a breaking API change
[INFO] [stdout]    |
[INFO] [stdout] 15 -     async fn write_packet(&mut self, x: heapless::Vec<u8,N>) -> Result<(),Self::Error>;
[INFO] [stdout] 15 +     fn write_packet(&mut self, x: heapless::Vec<u8,N>) -> impl std::future::Future<Output = Result<(),Self::Error>> + Send;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of `async fn` in public traits is discouraged as auto trait bounds cannot be specified
[INFO] [stdout]   --> src/lib.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     async fn flush(&mut self) -> Result<(),Self::Error>;
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: you can suppress this lint if you plan to use the trait only in your own code, or do not care about auto traits like `Send` on the `Future`
[INFO] [stdout] help: you can alternatively desugar to a normal `fn` that returns `impl Future` and add any desired bounds such as `Send`, but these cannot be relaxed without a breaking API change
[INFO] [stdout]    |
[INFO] [stdout] 16 -     async fn flush(&mut self) -> Result<(),Self::Error>;
[INFO] [stdout] 16 +     fn flush(&mut self) -> impl std::future::Future<Output = Result<(),Self::Error>> + Send;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.04s
[INFO] running `Command { std: "docker" "inspect" "510563c789d624904e388cf7a4493ae1fd3dfbbfac301886829681b22ca68f91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "510563c789d624904e388cf7a4493ae1fd3dfbbfac301886829681b22ca68f91", kill_on_drop: false }`
[INFO] [stdout] 510563c789d624904e388cf7a4493ae1fd3dfbbfac301886829681b22ca68f91
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6668a0aa89e4ab8ffd1aee2f0dc79f46a376395731bab5cbc8dc84b2362d1943
[INFO] running `Command { std: "docker" "start" "-a" "6668a0aa89e4ab8ffd1aee2f0dc79f46a376395731bab5cbc8dc84b2362d1943", kill_on_drop: false }`
[INFO] [stdout] warning: use of `async fn` in public traits is discouraged as auto trait bounds cannot be specified
[INFO] [stdout]  --> src/lib.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     async fn read_packet(&mut self) -> Result<heapless::Vec<u8, N>, Self::Error>;
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: you can suppress this lint if you plan to use the trait only in your own code, or do not care about auto traits like `Send` on the `Future`
[INFO] [stdout]   = note: `#[warn(async_fn_in_trait)]` on by default
[INFO] [stdout] help: you can alternatively desugar to a normal `fn` that returns `impl Future` and add any desired bounds such as `Send`, but these cannot be relaxed without a breaking API change
[INFO] [stdout]   |
[INFO] [stdout] 8 -     async fn read_packet(&mut self) -> Result<heapless::Vec<u8, N>, Self::Error>;
[INFO] [stdout] 8 +     fn read_packet(&mut self) -> impl std::future::Future<Output = Result<heapless::Vec<u8, N>, Self::Error>> + Send;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of `async fn` in public traits is discouraged as auto trait bounds cannot be specified
[INFO] [stdout]   --> src/lib.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     async fn write_packet(&mut self, x: heapless::Vec<u8,N>) -> Result<(),Self::Error>;
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: you can suppress this lint if you plan to use the trait only in your own code, or do not care about auto traits like `Send` on the `Future`
[INFO] [stdout] help: you can alternatively desugar to a normal `fn` that returns `impl Future` and add any desired bounds such as `Send`, but these cannot be relaxed without a breaking API change
[INFO] [stdout]    |
[INFO] [stdout] 15 -     async fn write_packet(&mut self, x: heapless::Vec<u8,N>) -> Result<(),Self::Error>;
[INFO] [stdout] 15 +     fn write_packet(&mut self, x: heapless::Vec<u8,N>) -> impl std::future::Future<Output = Result<(),Self::Error>> + Send;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling embedded-packet-io v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of `async fn` in public traits is discouraged as auto trait bounds cannot be specified
[INFO] [stdout]   --> src/lib.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     async fn flush(&mut self) -> Result<(),Self::Error>;
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: you can suppress this lint if you plan to use the trait only in your own code, or do not care about auto traits like `Send` on the `Future`
[INFO] [stdout] help: you can alternatively desugar to a normal `fn` that returns `impl Future` and add any desired bounds such as `Send`, but these cannot be relaxed without a breaking API change
[INFO] [stdout]    |
[INFO] [stdout] 16 -     async fn flush(&mut self) -> Result<(),Self::Error>;
[INFO] [stdout] 16 +     fn flush(&mut self) -> impl std::future::Future<Output = Result<(),Self::Error>> + Send;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of `async fn` in public traits is discouraged as auto trait bounds cannot be specified
[INFO] [stdout]  --> src/lib.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     async fn read_packet(&mut self) -> Result<heapless::Vec<u8, N>, Self::Error>;
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: you can suppress this lint if you plan to use the trait only in your own code, or do not care about auto traits like `Send` on the `Future`
[INFO] [stdout]   = note: `#[warn(async_fn_in_trait)]` on by default
[INFO] [stdout] help: you can alternatively desugar to a normal `fn` that returns `impl Future` and add any desired bounds such as `Send`, but these cannot be relaxed without a breaking API change
[INFO] [stdout]   |
[INFO] [stdout] 8 -     async fn read_packet(&mut self) -> Result<heapless::Vec<u8, N>, Self::Error>;
[INFO] [stdout] 8 +     fn read_packet(&mut self) -> impl std::future::Future<Output = Result<heapless::Vec<u8, N>, Self::Error>> + Send;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of `async fn` in public traits is discouraged as auto trait bounds cannot be specified
[INFO] [stdout]   --> src/lib.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     async fn write_packet(&mut self, x: heapless::Vec<u8,N>) -> Result<(),Self::Error>;
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: you can suppress this lint if you plan to use the trait only in your own code, or do not care about auto traits like `Send` on the `Future`
[INFO] [stdout] help: you can alternatively desugar to a normal `fn` that returns `impl Future` and add any desired bounds such as `Send`, but these cannot be relaxed without a breaking API change
[INFO] [stdout]    |
[INFO] [stdout] 15 -     async fn write_packet(&mut self, x: heapless::Vec<u8,N>) -> Result<(),Self::Error>;
[INFO] [stdout] 15 +     fn write_packet(&mut self, x: heapless::Vec<u8,N>) -> impl std::future::Future<Output = Result<(),Self::Error>> + Send;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of `async fn` in public traits is discouraged as auto trait bounds cannot be specified
[INFO] [stdout]   --> src/lib.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     async fn flush(&mut self) -> Result<(),Self::Error>;
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: you can suppress this lint if you plan to use the trait only in your own code, or do not care about auto traits like `Send` on the `Future`
[INFO] [stdout] help: you can alternatively desugar to a normal `fn` that returns `impl Future` and add any desired bounds such as `Send`, but these cannot be relaxed without a breaking API change
[INFO] [stdout]    |
[INFO] [stdout] 16 -     async fn flush(&mut self) -> Result<(),Self::Error>;
[INFO] [stdout] 16 +     fn flush(&mut self) -> impl std::future::Future<Output = Result<(),Self::Error>> + Send;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.25s
[INFO] running `Command { std: "docker" "inspect" "6668a0aa89e4ab8ffd1aee2f0dc79f46a376395731bab5cbc8dc84b2362d1943", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6668a0aa89e4ab8ffd1aee2f0dc79f46a376395731bab5cbc8dc84b2362d1943", kill_on_drop: false }`
[INFO] [stdout] 6668a0aa89e4ab8ffd1aee2f0dc79f46a376395731bab5cbc8dc84b2362d1943
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 94a8570d89ec691a5a83a90855276d65092824bbd175acc223c1d9266c5652fc
[INFO] running `Command { std: "docker" "start" "-a" "94a8570d89ec691a5a83a90855276d65092824bbd175acc223c1d9266c5652fc", kill_on_drop: false }`
[INFO] [stderr] warning: use of `async fn` in public traits is discouraged as auto trait bounds cannot be specified
[INFO] [stderr]  --> src/lib.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     async fn read_packet(&mut self) -> Result<heapless::Vec<u8, N>, Self::Error>;
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: you can suppress this lint if you plan to use the trait only in your own code, or do not care about auto traits like `Send` on the `Future`
[INFO] [stderr]   = note: `#[warn(async_fn_in_trait)]` on by default
[INFO] [stderr] help: you can alternatively desugar to a normal `fn` that returns `impl Future` and add any desired bounds such as `Send`, but these cannot be relaxed without a breaking API change
[INFO] [stderr]   |
[INFO] [stderr] 8 -     async fn read_packet(&mut self) -> Result<heapless::Vec<u8, N>, Self::Error>;
[INFO] [stderr] 8 +     fn read_packet(&mut self) -> impl std::future::Future<Output = Result<heapless::Vec<u8, N>, Self::Error>> + Send;
[INFO] [stderr]   |
[INFO] [stderr] 
[INFO] [stderr] warning: use of `async fn` in public traits is discouraged as auto trait bounds cannot be specified
[INFO] [stderr]   --> src/lib.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     async fn write_packet(&mut self, x: heapless::Vec<u8,N>) -> Result<(),Self::Error>;
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: you can suppress this lint if you plan to use the trait only in your own code, or do not care about auto traits like `Send` on the `Future`
[INFO] [stderr] help: you can alternatively desugar to a normal `fn` that returns `impl Future` and add any desired bounds such as `Send`, but these cannot be relaxed without a breaking API change
[INFO] [stderr]    |
[INFO] [stderr] 15 -     async fn write_packet(&mut self, x: heapless::Vec<u8,N>) -> Result<(),Self::Error>;
[INFO] [stderr] 15 +     fn write_packet(&mut self, x: heapless::Vec<u8,N>) -> impl std::future::Future<Output = Result<(),Self::Error>> + Send;
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: use of `async fn` in public traits is discouraged as auto trait bounds cannot be specified
[INFO] [stderr]   --> src/lib.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     async fn flush(&mut self) -> Result<(),Self::Error>;
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: you can suppress this lint if you plan to use the trait only in your own code, or do not care about auto traits like `Send` on the `Future`
[INFO] [stderr] help: you can alternatively desugar to a normal `fn` that returns `impl Future` and add any desired bounds such as `Send`, but these cannot be relaxed without a breaking API change
[INFO] [stderr]    |
[INFO] [stderr] 16 -     async fn flush(&mut self) -> Result<(),Self::Error>;
[INFO] [stderr] 16 +     fn flush(&mut self) -> impl std::future::Future<Output = Result<(),Self::Error>> + Send;
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: `embedded-packet-io` (lib) generated 3 warnings
[INFO] [stderr] warning: `embedded-packet-io` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/embedded_packet_io-d82a47b03214c0ba)
[INFO] [stderr]    Doc-tests embedded_packet_io
[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] [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" "94a8570d89ec691a5a83a90855276d65092824bbd175acc223c1d9266c5652fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94a8570d89ec691a5a83a90855276d65092824bbd175acc223c1d9266c5652fc", kill_on_drop: false }`
[INFO] [stdout] 94a8570d89ec691a5a83a90855276d65092824bbd175acc223c1d9266c5652fc