[INFO] updating cached repository https://github.com/realityone/akarin
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6734d9b14288800ee23415a6a900fe115c803960
[INFO] checking realityone/akarin against try#ea663bba38739867a4b75ac820991b4f5d093c3b for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frealityone%2Fakarin" "/workspace/builds/worker-9/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/realityone/akarin on toolchain ea663bba38739867a4b75ac820991b4f5d093c3b
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/realityone/akarin
[INFO] finished tweaking git repo https://github.com/realityone/akarin
[INFO] tweaked toml for git repo https://github.com/realityone/akarin written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/realityone/akarin already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 52699d9529dc39354fa0c05cee24d92d65363995d1d7610cd43e82fa8bf471c3
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "52699d9529dc39354fa0c05cee24d92d65363995d1d7610cd43e82fa8bf471c3"`
[INFO] [stderr]    Compiling either v1.2.0
[INFO] [stderr]     Checking ioctl-sys v0.5.2
[INFO] [stderr]     Checking transient-hashmap v0.4.0
[INFO] [stderr]     Checking backtrace-sys v0.1.14
[INFO] [stderr]     Checking env_logger v0.4.3
[INFO] [stderr]     Checking tokio-core v0.1.10
[INFO] [stderr]     Checking backtrace v0.3.3
[INFO] [stderr]    Compiling coco v0.1.1
[INFO] [stderr]     Checking pretty_env_logger v0.1.1
[INFO] [stderr]     Checking error-chain v0.11.0
[INFO] [stderr]    Compiling rayon-core v1.2.1
[INFO] [stderr]    Compiling rayon v0.8.2
[INFO] [stderr]    Compiling ring v0.12.1
[INFO] [stderr]     Checking akarin v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `mem`
[INFO] [stderr]  --> src/akarin/server.rs:1:20
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::{fmt, io, mem};
[INFO] [stderr]   |                    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/akarin/server.rs:28:17
[INFO] [stderr]    |
[INFO] [stderr] 28 |     crypto: &'a Crypto,
[INFO] [stderr]    |                 ^^^^^^ help: use `dyn`: `dyn Crypto`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/akarin/server.rs:124:41
[INFO] [stderr]     |
[INFO] [stderr] 124 |     fn new<'b>(tun: Device, crypto: &'a Crypto, udp: UdpSocket, configuration: &'b ServerConfiguration) -> Self {
[INFO] [stderr]     |                                         ^^^^^^ help: use `dyn`: `dyn Crypto`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/akarin/client.rs:15:17
[INFO] [stderr]    |
[INFO] [stderr] 15 |     crypto: &'a Crypto,
[INFO] [stderr]    |                 ^^^^^^ help: use `dyn`: `dyn Crypto`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/akarin/client.rs:24:41
[INFO] [stderr]    |
[INFO] [stderr] 24 |     fn new<'d>(tun: Device, crypto: &'a Crypto, udp: UdpSocket, configuration: &'d ClientConfiguration) -> Self {
[INFO] [stderr]    |                                         ^^^^^^ help: use `dyn`: `dyn Crypto`
[INFO] [stderr] 
[INFO] [stderr] warning: patterns aren't allowed in methods without bodies
[INFO] [stderr]   --> src/akarin/mod.rs:26:20
[INFO] [stderr]    |
[INFO] [stderr] 26 |     fn serve(self, mut core: Core, handle: Handle) -> Result<()>;
[INFO] [stderr]    |                    ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(patterns_in_fns_without_body)]` on by default
[INFO] [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]    = note: for more information, see issue #35203 <https://github.com/rust-lang/rust/issues/35203>
[INFO] [stderr] 
[INFO] [stderr] warning: patterns aren't allowed in methods without bodies
[INFO] [stderr]   --> src/akarin/mod.rs:30:22
[INFO] [stderr]    |
[INFO] [stderr] 30 |     fn connect(self, mut core: Core, handle: Handle) -> Result<()>;
[INFO] [stderr]    |                      ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]    = note: for more information, see issue #35203 <https://github.com/rust-lang/rust/issues/35203>
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/crypto/chacha20_poly1305.rs:9:43
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub fn init_crypto(password: &str) -> Box<Crypto> {
[INFO] [stderr]   |                                           ^^^^^^ help: use `dyn`: `dyn Crypto`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/crypto/mod.rs:21:46
[INFO] [stderr]    |
[INFO] [stderr] 21 |     pub fn init(self, password: &str) -> Box<Crypto> {
[INFO] [stderr]    |                                              ^^^^^^ help: use `dyn`: `dyn Crypto`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `common::error::*`
[INFO] [stderr]  --> src/transport/network.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use common::error::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::ONCE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> src/transport/network.rs:8:1
[INFO] [stderr]    |
[INFO] [stderr] 8  | / lazy_static!{
[INFO] [stderr] 9  | |    pub static ref IPV4_HEADER_LEN: usize = mem::size_of::<IPv4Header>();
[INFO] [stderr] 10 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::ONCE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> src/transport/network.rs:8:1
[INFO] [stderr]    |
[INFO] [stderr] 8  | / lazy_static!{
[INFO] [stderr] 9  | |    pub static ref IPV4_HEADER_LEN: usize = mem::size_of::<IPv4Header>();
[INFO] [stderr] 10 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `mem`
[INFO] [stderr]  --> src/akarin/server.rs:1:20
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::{fmt, io, mem};
[INFO] [stderr]   |                    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/akarin/server.rs:28:17
[INFO] [stderr]    |
[INFO] [stderr] 28 |     crypto: &'a Crypto,
[INFO] [stderr]    |                 ^^^^^^ help: use `dyn`: `dyn Crypto`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/akarin/server.rs:124:41
[INFO] [stderr]     |
[INFO] [stderr] 124 |     fn new<'b>(tun: Device, crypto: &'a Crypto, udp: UdpSocket, configuration: &'b ServerConfiguration) -> Self {
[INFO] [stderr]     |                                         ^^^^^^ help: use `dyn`: `dyn Crypto`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/akarin/client.rs:15:17
[INFO] [stderr]    |
[INFO] [stderr] 15 |     crypto: &'a Crypto,
[INFO] [stderr]    |                 ^^^^^^ help: use `dyn`: `dyn Crypto`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/akarin/client.rs:24:41
[INFO] [stderr]    |
[INFO] [stderr] 24 |     fn new<'d>(tun: Device, crypto: &'a Crypto, udp: UdpSocket, configuration: &'d ClientConfiguration) -> Self {
[INFO] [stderr]    |                                         ^^^^^^ help: use `dyn`: `dyn Crypto`
[INFO] [stderr] 
[INFO] [stderr] warning: patterns aren't allowed in methods without bodies
[INFO] [stderr]   --> src/akarin/mod.rs:26:20
[INFO] [stderr]    |
[INFO] [stderr] 26 |     fn serve(self, mut core: Core, handle: Handle) -> Result<()>;
[INFO] [stderr]    |                    ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(patterns_in_fns_without_body)]` on by default
[INFO] [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]    = note: for more information, see issue #35203 <https://github.com/rust-lang/rust/issues/35203>
[INFO] [stderr] 
[INFO] [stderr] warning: patterns aren't allowed in methods without bodies
[INFO] [stderr]   --> src/akarin/mod.rs:30:22
[INFO] [stderr]    |
[INFO] [stderr] 30 |     fn connect(self, mut core: Core, handle: Handle) -> Result<()>;
[INFO] [stderr]    |                      ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]    = note: for more information, see issue #35203 <https://github.com/rust-lang/rust/issues/35203>
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/crypto/chacha20_poly1305.rs:9:43
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub fn init_crypto(password: &str) -> Box<Crypto> {
[INFO] [stderr]   |                                           ^^^^^^ help: use `dyn`: `dyn Crypto`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/crypto/mod.rs:21:46
[INFO] [stderr]    |
[INFO] [stderr] 21 |     pub fn init(self, password: &str) -> Box<Crypto> {
[INFO] [stderr]    |                                              ^^^^^^ help: use `dyn`: `dyn Crypto`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `common::error::*`
[INFO] [stderr]  --> src/transport/network.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use common::error::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::ONCE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> src/transport/network.rs:8:1
[INFO] [stderr]    |
[INFO] [stderr] 8  | / lazy_static!{
[INFO] [stderr] 9  | |    pub static ref IPV4_HEADER_LEN: usize = mem::size_of::<IPv4Header>();
[INFO] [stderr] 10 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::ONCE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> src/transport/network.rs:8:1
[INFO] [stderr]    |
[INFO] [stderr] 8  | / lazy_static!{
[INFO] [stderr] 9  | |    pub static ref IPV4_HEADER_LEN: usize = mem::size_of::<IPv4Header>();
[INFO] [stderr] 10 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/common/error.rs:1:1
[INFO] [stderr]    |
[INFO] [stderr] 1  | / error_chain! {
[INFO] [stderr] 2  | |     errors {
[INFO] [stderr] 3  | |         // Tun
[INFO] [stderr] 4  | |         TunNameTooLong
[INFO] [stderr] ...  |
[INFO] [stderr] 26 | |     }
[INFO] [stderr] 27 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `crypto`
[INFO] [stderr]   --> src/main.rs:37:9
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let crypto = Ciphers::CHACHA20_POLY1305.init(password);
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_crypto`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `token`
[INFO] [stderr]    --> src/akarin/server.rs:157:27
[INFO] [stderr]     |
[INFO] [stderr] 157 |             if let Some(&(token, sockaddr)) = self.clients.get(client_id) {}
[INFO] [stderr]     |                           ^^^^^ help: consider prefixing with an underscore: `_token`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sockaddr`
[INFO] [stderr]    --> src/akarin/server.rs:157:34
[INFO] [stderr]     |
[INFO] [stderr] 157 |             if let Some(&(token, sockaddr)) = self.clients.get(client_id) {}
[INFO] [stderr]     |                                  ^^^^^^^^ help: consider prefixing with an underscore: `_sockaddr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `handle`
[INFO] [stderr]    --> src/akarin/server.rs:163:40
[INFO] [stderr]     |
[INFO] [stderr] 163 |     fn serve(mut self, mut core: Core, handle: Handle) -> Result<()> {
[INFO] [stderr]     |                                        ^^^^^^ help: consider prefixing with an underscore: `_handle`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `core`
[INFO] [stderr]   --> src/akarin/client.rs:39:26
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn connect(self, mut core: Core, handle: Handle) -> Result<()> {
[INFO] [stderr]    |                          ^^^^ help: consider prefixing with an underscore: `_core`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `handle`
[INFO] [stderr]   --> src/akarin/client.rs:39:38
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn connect(self, mut core: Core, handle: Handle) -> Result<()> {
[INFO] [stderr]    |                                      ^^^^^^ help: consider prefixing with an underscore: `_handle`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/akarin/server.rs:163:14
[INFO] [stderr]     |
[INFO] [stderr] 163 |     fn serve(mut self, mut core: Core, handle: Handle) -> Result<()> {
[INFO] [stderr]     |              ----^^^^
[INFO] [stderr]     |              |
[INFO] [stderr]     |              help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/akarin/client.rs:39:22
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn connect(self, mut core: Core, handle: Handle) -> Result<()> {
[INFO] [stderr]    |                      ----^^^^
[INFO] [stderr]    |                      |
[INFO] [stderr]    |                      help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/common/error.rs:1:1
[INFO] [stderr]    |
[INFO] [stderr] 1  | / error_chain! {
[INFO] [stderr] 2  | |     errors {
[INFO] [stderr] 3  | |         // Tun
[INFO] [stderr] 4  | |         TunNameTooLong
[INFO] [stderr] ...  |
[INFO] [stderr] 26 | |     }
[INFO] [stderr] 27 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `crypto`
[INFO] [stderr]   --> src/main.rs:37:9
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let crypto = Ciphers::CHACHA20_POLY1305.init(password);
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_crypto`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `token`
[INFO] [stderr]    --> src/akarin/server.rs:157:27
[INFO] [stderr]     |
[INFO] [stderr] 157 |             if let Some(&(token, sockaddr)) = self.clients.get(client_id) {}
[INFO] [stderr]     |                           ^^^^^ help: consider prefixing with an underscore: `_token`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sockaddr`
[INFO] [stderr]    --> src/akarin/server.rs:157:34
[INFO] [stderr]     |
[INFO] [stderr] 157 |             if let Some(&(token, sockaddr)) = self.clients.get(client_id) {}
[INFO] [stderr]     |                                  ^^^^^^^^ help: consider prefixing with an underscore: `_sockaddr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `handle`
[INFO] [stderr]    --> src/akarin/server.rs:163:40
[INFO] [stderr]     |
[INFO] [stderr] 163 |     fn serve(mut self, mut core: Core, handle: Handle) -> Result<()> {
[INFO] [stderr]     |                                        ^^^^^^ help: consider prefixing with an underscore: `_handle`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `core`
[INFO] [stderr]   --> src/akarin/client.rs:39:26
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn connect(self, mut core: Core, handle: Handle) -> Result<()> {
[INFO] [stderr]    |                          ^^^^ help: consider prefixing with an underscore: `_core`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `handle`
[INFO] [stderr]   --> src/akarin/client.rs:39:38
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn connect(self, mut core: Core, handle: Handle) -> Result<()> {
[INFO] [stderr]    |                                      ^^^^^^ help: consider prefixing with an underscore: `_handle`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/akarin/server.rs:164:9
[INFO] [stderr]     |
[INFO] [stderr] 164 |         core.run(self);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/akarin/server.rs:163:14
[INFO] [stderr]     |
[INFO] [stderr] 163 |     fn serve(mut self, mut core: Core, handle: Handle) -> Result<()> {
[INFO] [stderr]     |              ----^^^^
[INFO] [stderr]     |              |
[INFO] [stderr]     |              help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/akarin/client.rs:39:22
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn connect(self, mut core: Core, handle: Handle) -> Result<()> {
[INFO] [stderr]    |                      ----^^^^
[INFO] [stderr]    |                      |
[INFO] [stderr]    |                      help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/akarin/server.rs:164:9
[INFO] [stderr]     |
[INFO] [stderr] 164 |         core.run(self);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.25s
[INFO] running `"docker" "inspect" "52699d9529dc39354fa0c05cee24d92d65363995d1d7610cd43e82fa8bf471c3"`
[INFO] running `"docker" "rm" "-f" "52699d9529dc39354fa0c05cee24d92d65363995d1d7610cd43e82fa8bf471c3"`
[INFO] [stdout] 52699d9529dc39354fa0c05cee24d92d65363995d1d7610cd43e82fa8bf471c3