[INFO] crate tokio-ping 0.2.0 is already in cache
[INFO] extracting crate tokio-ping 0.2.0 into work/ex/clippy-test-run/sources/stable/reg/tokio-ping/0.2.0
[INFO] extracting crate tokio-ping 0.2.0 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/tokio-ping/0.2.0
[INFO] validating manifest of tokio-ping-0.2.0 on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of tokio-ping-0.2.0 on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing tokio-ping-0.2.0
[INFO] finished frobbing tokio-ping-0.2.0
[INFO] frobbed toml for tokio-ping-0.2.0 written to work/ex/clippy-test-run/sources/stable/reg/tokio-ping/0.2.0/Cargo.toml
[INFO] started frobbing tokio-ping-0.2.0
[INFO] finished frobbing tokio-ping-0.2.0
[INFO] frobbed toml for tokio-ping-0.2.0 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/tokio-ping/0.2.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting tokio-ping-0.2.0 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-0/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/tokio-ping/0.2.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 856e028745e9fcf67b80ac7fb2d508bc8f2032edf10042b31ffbe67efa31005a
[INFO] running `"docker" "start" "-a" "856e028745e9fcf67b80ac7fb2d508bc8f2032edf10042b31ffbe67efa31005a"`
[INFO] [stderr]     Checking socket2 v0.3.8
[INFO] [stderr]     Checking tokio-ping v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/errors.rs:34:17
[INFO] [stderr]    |
[INFO] [stderr] 34 |         Error { inner: inner }
[INFO] [stderr]    |                 ^^^^^^^^^^^^ help: replace it with: `inner`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/packet/ipv4.rs:57:13
[INFO] [stderr]    |
[INFO] [stderr] 57 |             protocol: protocol,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^ help: replace it with: `protocol`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:151:13
[INFO] [stderr]     |
[INFO] [stderr] 151 |             pinger: pinger,
[INFO] [stderr]     |             ^^^^^^^^^^^^^^ help: replace it with: `pinger`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:152:13
[INFO] [stderr]     |
[INFO] [stderr] 152 |             hostname: hostname,
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^ help: replace it with: `hostname`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:228:13
[INFO] [stderr]     |
[INFO] [stderr] 228 |             chain: chain,
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: replace it with: `chain`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:229:13
[INFO] [stderr]     |
[INFO] [stderr] 229 |             future: future,
[INFO] [stderr]     |             ^^^^^^^^^^^^^^ help: replace it with: `future`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:336:13
[INFO] [stderr]     |
[INFO] [stderr] 336 |             sockets: sockets,
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^ help: replace it with: `sockets`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:337:13
[INFO] [stderr]     |
[INFO] [stderr] 337 |             state: state,
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: replace it with: `state`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:371:13
[INFO] [stderr]     |
[INFO] [stderr] 371 |             ident: ident,
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: replace it with: `ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:372:13
[INFO] [stderr]     |
[INFO] [stderr] 372 |             seq_cnt: seq_cnt,
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^ help: replace it with: `seq_cnt`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:412:17
[INFO] [stderr]     |
[INFO] [stderr] 412 |                 token: token,
[INFO] [stderr]     |                 ^^^^^^^^^^^^ help: replace it with: `token`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:415:17
[INFO] [stderr]     |
[INFO] [stderr] 415 |                 receiver: receiver,
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^ help: replace it with: `receiver`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:459:13
[INFO] [stderr]     |
[INFO] [stderr] 459 |             socket: socket,
[INFO] [stderr]     |             ^^^^^^^^^^^^^^ help: replace it with: `socket`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:460:13
[INFO] [stderr]     |
[INFO] [stderr] 460 |             state: state,
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: replace it with: `state`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/socket/mio.rs:18:19
[INFO] [stderr]    |
[INFO] [stderr] 18 |         Ok(Self { socket: socket })
[INFO] [stderr]    |                   ^^^^^^^^^^^^^^ help: replace it with: `socket`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/socket/tokio.rs:39:17
[INFO] [stderr]    |
[INFO] [stderr] 39 |                 buf: buf,
[INFO] [stderr]    |                 ^^^^^^^^ help: replace it with: `buf`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/errors.rs:34:17
[INFO] [stderr]    |
[INFO] [stderr] 34 |         Error { inner: inner }
[INFO] [stderr]    |                 ^^^^^^^^^^^^ help: replace it with: `inner`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/packet/ipv4.rs:57:13
[INFO] [stderr]    |
[INFO] [stderr] 57 |             protocol: protocol,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^ help: replace it with: `protocol`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:151:13
[INFO] [stderr]     |
[INFO] [stderr] 151 |             pinger: pinger,
[INFO] [stderr]     |             ^^^^^^^^^^^^^^ help: replace it with: `pinger`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:152:13
[INFO] [stderr]     |
[INFO] [stderr] 152 |             hostname: hostname,
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^ help: replace it with: `hostname`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:228:13
[INFO] [stderr]     |
[INFO] [stderr] 228 |             chain: chain,
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: replace it with: `chain`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:229:13
[INFO] [stderr]     |
[INFO] [stderr] 229 |             future: future,
[INFO] [stderr]     |             ^^^^^^^^^^^^^^ help: replace it with: `future`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:336:13
[INFO] [stderr]     |
[INFO] [stderr] 336 |             sockets: sockets,
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^ help: replace it with: `sockets`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:337:13
[INFO] [stderr]     |
[INFO] [stderr] 337 |             state: state,
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: replace it with: `state`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:371:13
[INFO] [stderr]     |
[INFO] [stderr] 371 |             ident: ident,
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: replace it with: `ident`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:372:13
[INFO] [stderr]     |
[INFO] [stderr] 372 |             seq_cnt: seq_cnt,
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^ help: replace it with: `seq_cnt`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:412:17
[INFO] [stderr]     |
[INFO] [stderr] 412 |                 token: token,
[INFO] [stderr]     |                 ^^^^^^^^^^^^ help: replace it with: `token`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:415:17
[INFO] [stderr]     |
[INFO] [stderr] 415 |                 receiver: receiver,
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^ help: replace it with: `receiver`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:459:13
[INFO] [stderr]     |
[INFO] [stderr] 459 |             socket: socket,
[INFO] [stderr]     |             ^^^^^^^^^^^^^^ help: replace it with: `socket`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/ping.rs:460:13
[INFO] [stderr]     |
[INFO] [stderr] 460 |             state: state,
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: replace it with: `state`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/socket/mio.rs:18:19
[INFO] [stderr]    |
[INFO] [stderr] 18 |         Ok(Self { socket: socket })
[INFO] [stderr]    |                   ^^^^^^^^^^^^^^ help: replace it with: `socket`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/socket/tokio.rs:39:17
[INFO] [stderr]    |
[INFO] [stderr] 39 |                 buf: buf,
[INFO] [stderr]    |                 ^^^^^^^^ help: replace it with: `buf`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_err()`
[INFO] [stderr]   --> src/packet/icmp.rs:53:16
[INFO] [stderr]    |
[INFO] [stderr] 53 |           if let Err(_) = (&mut buffer[8..]).write(self.payload) {
[INFO] [stderr]    |  _________-      ^^^^^^
[INFO] [stderr] 54 | |             return Err(Error::InvalidSize)
[INFO] [stderr] 55 | |         }
[INFO] [stderr]    | |_________- help: try this: `if (&mut buffer[8..]).write(self.payload).is_err()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_pattern_matching)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: this call to `as_ref` does nothing
[INFO] [stderr]   --> src/packet/icmp.rs:70:12
[INFO] [stderr]    |
[INFO] [stderr] 70 |         if buffer.as_ref().len() < HEADER_SIZE {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^ help: try this: `buffer`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::useless_asref)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_asref
[INFO] [stderr] 
[INFO] [stderr] warning: large size difference between variants
[INFO] [stderr]   --> src/ping.rs:58:5
[INFO] [stderr]    |
[INFO] [stderr] 58 |     Normal(NormalPingFutureKind),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::large_enum_variant)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#large_enum_variant
[INFO] [stderr] help: consider boxing the large fields to reduce the total size of the enum
[INFO] [stderr]    |
[INFO] [stderr] 58 |     Normal(Box<NormalPingFutureKind>),
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_err()`
[INFO] [stderr]    --> src/ping.rs:400:16
[INFO] [stderr]     |
[INFO] [stderr] 400 |           if let Err(_) = encode_result {
[INFO] [stderr]     |  _________-      ^^^^^^
[INFO] [stderr] 401 | |             return PingFuture {
[INFO] [stderr] 402 | |                 inner: PingFutureKind::PacketEncodeError
[INFO] [stderr] 403 | |             }
[INFO] [stderr] 404 | |         }
[INFO] [stderr]     | |_________- help: try this: `if encode_result.is_err()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_err()`
[INFO] [stderr]   --> src/packet/icmp.rs:53:16
[INFO] [stderr]    |
[INFO] [stderr] 53 |           if let Err(_) = (&mut buffer[8..]).write(self.payload) {
[INFO] [stderr]    |  _________-      ^^^^^^
[INFO] [stderr] 54 | |             return Err(Error::InvalidSize)
[INFO] [stderr] 55 | |         }
[INFO] [stderr]    | |_________- help: try this: `if (&mut buffer[8..]).write(self.payload).is_err()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_pattern_matching)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr] warning: this call to `as_ref` does nothing
[INFO] [stderr]   --> src/packet/icmp.rs:70:12
[INFO] [stderr]    |
[INFO] [stderr] 70 |         if buffer.as_ref().len() < HEADER_SIZE {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^ help: try this: `buffer`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::useless_asref)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_asref
[INFO] [stderr] 
[INFO] [stderr] warning: large size difference between variants
[INFO] [stderr]   --> src/ping.rs:58:5
[INFO] [stderr]    |
[INFO] [stderr] 58 |     Normal(NormalPingFutureKind),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::large_enum_variant)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#large_enum_variant
[INFO] [stderr] help: consider boxing the large fields to reduce the total size of the enum
[INFO] [stderr]    |
[INFO] [stderr] 58 |     Normal(Box<NormalPingFutureKind>),
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: redundant pattern matching, consider using `is_err()`
[INFO] [stderr]    --> src/ping.rs:400:16
[INFO] [stderr]     |
[INFO] [stderr] 400 |           if let Err(_) = encode_result {
[INFO] [stderr]     |  _________-      ^^^^^^
[INFO] [stderr] 401 | |             return PingFuture {
[INFO] [stderr] 402 | |                 inner: PingFutureKind::PacketEncodeError
[INFO] [stderr] 403 | |             }
[INFO] [stderr] 404 | |         }
[INFO] [stderr]     | |_________- help: try this: `if encode_result.is_err()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.32s
[INFO] running `"docker" "inspect" "856e028745e9fcf67b80ac7fb2d508bc8f2032edf10042b31ffbe67efa31005a"`
[INFO] running `"docker" "rm" "-f" "856e028745e9fcf67b80ac7fb2d508bc8f2032edf10042b31ffbe67efa31005a"`
[INFO] [stdout] 856e028745e9fcf67b80ac7fb2d508bc8f2032edf10042b31ffbe67efa31005a