Dec 19 06:57:30.556 INFO checking tnpxu/event-horizon against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 06:57:30.556 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-3/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/tnpxu/event-horizon:/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 06:57:30.964 INFO [stdout] 9b10e6db6471aaa8c659807986a080adbbc860e2c2065840381a6dd905e0d84d
Dec 19 06:57:30.972 INFO running `"docker" "start" "-a" "9b10e6db6471aaa8c659807986a080adbbc860e2c2065840381a6dd905e0d84d"`
Dec 19 06:57:33.572 INFO [stderr]     Checking lazycell v1.1.0
Dec 19 06:57:33.574 INFO [stderr]    Compiling rand_core v0.2.1
Dec 19 06:57:33.606 INFO [stderr]    Compiling openssl v0.10.12
Dec 19 06:57:33.612 INFO [stderr]     Checking abomonation v0.7.0
Dec 19 06:57:33.614 INFO [stderr]     Checking timely_bytes v0.7.0
Dec 19 06:57:33.616 INFO [stderr]     Checking timely_logging v0.7.0
Dec 19 06:57:33.633 INFO [stderr]     Checking utf-8 v0.7.4
Dec 19 06:57:33.635 INFO [stderr]     Checking timely_sort v0.1.6
Dec 19 06:57:34.536 INFO [stderr]    Compiling unicase v2.1.0
Dec 19 06:57:34.921 INFO [stderr]    Compiling memchr v2.1.0
Dec 19 06:57:35.028 INFO [stderr]     Checking tokio-service v0.1.0
Dec 19 06:57:35.063 INFO [stderr]     Checking relay v0.1.1
Dec 19 06:57:36.536 INFO [stderr]    Compiling openssl-sys v0.9.36
Dec 19 06:57:36.561 INFO [stderr]     Checking base64 v0.9.3
Dec 19 06:57:36.603 INFO [stderr]     Checking uuid v0.6.5
Dec 19 06:57:36.669 INFO [stderr]     Checking mio v0.6.16
Dec 19 06:57:36.849 INFO [stderr]     Checking want v0.0.4
Dec 19 06:57:37.004 INFO [stderr]    Compiling unicase v1.4.2
Dec 19 06:57:37.412 INFO [stderr]     Checking input_buffer v0.2.0
Dec 19 06:57:37.827 INFO [stderr]    Compiling rand v0.5.5
Dec 19 06:57:39.016 INFO [stderr]     Checking serde_json v1.0.27
Dec 19 06:57:39.085 INFO [stderr]     Checking ring v0.13.2
Dec 19 06:57:39.173 INFO [stderr]     Checking phf_shared v0.7.23
Dec 19 06:57:40.956 INFO [stderr]    Compiling abomonation_derive v0.3.0
Dec 19 06:57:42.426 INFO [stderr]     Checking libflate v0.1.16
Dec 19 06:57:42.436 INFO [stderr]     Checking serde_urlencoded v0.5.3
Dec 19 06:57:42.850 INFO [stderr]     Checking phf v0.7.23
Dec 19 06:57:43.357 INFO [stderr]     Checking error-chain v0.12.0
Dec 19 06:57:43.664 INFO [stderr]     Checking sha-1 v0.7.0
Dec 19 06:57:44.260 INFO [stderr]    Compiling serde_derive v1.0.79
Dec 19 06:57:44.394 INFO [stderr]     Checking csv-core v0.1.4
Dec 19 06:57:44.610 INFO [stderr]     Checking parking_lot v0.6.4
Dec 19 06:57:44.819 INFO [stderr]     Checking mio-uds v0.6.7
Dec 19 06:57:45.320 INFO [stderr]     Checking timely_communication v0.7.0
Dec 19 06:57:45.933 INFO [stderr]    Compiling openssl v0.9.24
Dec 19 06:57:45.988 INFO [stderr]    Compiling native-tls v0.2.1
Dec 19 06:57:46.028 INFO [stderr]     Checking mime v0.3.9
Dec 19 06:57:46.294 INFO [stderr]     Checking csv v1.0.1
Dec 19 06:57:46.542 INFO [stderr]     Checking tokio-reactor v0.1.5
Dec 19 06:57:48.300 INFO [stderr]     Checking tokio-uds v0.2.1
Dec 19 06:57:48.300 INFO [stderr]     Checking tokio-udp v0.1.2
Dec 19 06:57:48.749 INFO [stderr]     Checking tokio-tcp v0.1.1
Dec 19 06:57:48.860 INFO [stderr]     Checking timely v0.7.0
Dec 19 06:57:50.821 INFO [stderr]     Checking tokio v0.1.8
Dec 19 06:57:51.011 INFO [stderr]    Compiling phf_generator v0.7.23
Dec 19 06:57:51.464 INFO [stderr]    Compiling phf_codegen v0.7.23
Dec 19 06:57:52.392 INFO [stderr]    Compiling mime_guess v2.0.0-alpha.6
Dec 19 06:57:52.436 INFO [stderr]     Checking tokio-core v0.1.17
Dec 19 06:57:53.064 INFO [stderr]     Checking native-tls v0.1.5
Dec 19 06:57:56.278 INFO [stderr]     Checking tokio-tls v0.1.4
Dec 19 06:57:56.476 INFO [stderr]     Checking hyper v0.11.27
Dec 19 06:57:58.676 INFO [stderr]     Checking tungstenite v0.6.0
Dec 19 06:58:03.418 INFO [stderr]     Checking differential-dataflow v0.7.0
Dec 19 06:58:11.328 INFO [stderr]     Checking hyper-tls v0.1.4
Dec 19 06:58:13.813 INFO [stderr]     Checking reqwest v0.8.8
Dec 19 06:58:20.626 INFO [stderr]     Checking event-horizon v0.1.0 (/opt/crater/workdir)
Dec 19 06:58:21.032 INFO [stderr] warning: unused import: `serde_json::from_str`
Dec 19 06:58:21.032 INFO [stderr]  --> src/websockets.rs:3:5
Dec 19 06:58:21.032 INFO [stderr]   |
Dec 19 06:58:21.032 INFO [stderr] 3 | use serde_json::from_str;
Dec 19 06:58:21.032 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
Dec 19 06:58:21.032 INFO [stderr]   |
Dec 19 06:58:21.032 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 06:58:21.032 INFO [stderr] 
Dec 19 06:58:21.132 INFO [stderr] warning: unused import: `serde_json::from_str`
Dec 19 06:58:21.132 INFO [stderr]  --> src/websockets.rs:3:5
Dec 19 06:58:21.132 INFO [stderr]   |
Dec 19 06:58:21.132 INFO [stderr] 3 | use serde_json::from_str;
Dec 19 06:58:21.132 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
Dec 19 06:58:21.132 INFO [stderr]   |
Dec 19 06:58:21.132 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 06:58:21.132 INFO [stderr] 
Dec 19 06:58:21.148 INFO [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
Dec 19 06:58:21.148 INFO [stderr]   --> src/errors.rs:6:1
Dec 19 06:58:21.148 INFO [stderr]    |
Dec 19 06:58:21.148 INFO [stderr] 6  | / error_chain! {
Dec 19 06:58:21.148 INFO [stderr] 7  | |     types {
Dec 19 06:58:21.148 INFO [stderr] 8  | |         Error, ErrorKind, ResultExt, Result;
Dec 19 06:58:21.148 INFO [stderr] 9  | |     }
Dec 19 06:58:21.148 INFO [stderr] ...  |
Dec 19 06:58:21.148 INFO [stderr] 19 | |     }
Dec 19 06:58:21.148 INFO [stderr] 20 | | }
Dec 19 06:58:21.148 INFO [stderr]    | |_^
Dec 19 06:58:21.149 INFO [stderr]    |
Dec 19 06:58:21.149 INFO [stderr]    = note: #[warn(deprecated)] on by default
Dec 19 06:58:21.149 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 19 06:58:21.149 INFO [stderr] 
Dec 19 06:58:21.149 INFO [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
Dec 19 06:58:21.149 INFO [stderr]   --> src/errors.rs:6:1
Dec 19 06:58:21.149 INFO [stderr]    |
Dec 19 06:58:21.149 INFO [stderr] 6  | / error_chain! {
Dec 19 06:58:21.149 INFO [stderr] 7  | |     types {
Dec 19 06:58:21.149 INFO [stderr] 8  | |         Error, ErrorKind, ResultExt, Result;
Dec 19 06:58:21.149 INFO [stderr] 9  | |     }
Dec 19 06:58:21.149 INFO [stderr] ...  |
Dec 19 06:58:21.149 INFO [stderr] 19 | |     }
Dec 19 06:58:21.149 INFO [stderr] 20 | | }
Dec 19 06:58:21.149 INFO [stderr]    | |_^
Dec 19 06:58:21.149 INFO [stderr]    |
Dec 19 06:58:21.149 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 19 06:58:21.149 INFO [stderr] 
Dec 19 06:58:21.172 INFO [stderr] warning: unused variable: `msg`
Dec 19 06:58:21.172 INFO [stderr]   --> src/websockets.rs:50:20
Dec 19 06:58:21.172 INFO [stderr]    |
Dec 19 06:58:21.172 INFO [stderr] 50 |                 Ok(msg) => {
Dec 19 06:58:21.172 INFO [stderr]    |                    ^^^ help: consider using `_msg` instead
Dec 19 06:58:21.172 INFO [stderr]    |
Dec 19 06:58:21.172 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 06:58:21.172 INFO [stderr] 
Dec 19 06:58:21.172 INFO [stderr] warning: unused variable: `e`
Dec 19 06:58:21.172 INFO [stderr]   --> src/websockets.rs:53:21
Dec 19 06:58:21.172 INFO [stderr]    |
Dec 19 06:58:21.172 INFO [stderr] 53 |                 Err(e) => {
Dec 19 06:58:21.172 INFO [stderr]    |                     ^ help: consider using `_e` instead
Dec 19 06:58:21.172 INFO [stderr] 
Dec 19 06:58:21.172 INFO [stderr] warning: unused variable: `e`
Dec 19 06:58:21.172 INFO [stderr]   --> src/websockets.rs:72:21
Dec 19 06:58:21.172 INFO [stderr]    |
Dec 19 06:58:21.172 INFO [stderr] 72 |                 Err(e) => {
Dec 19 06:58:21.172 INFO [stderr]    |                     ^ help: consider using `_e` instead
Dec 19 06:58:21.172 INFO [stderr] 
Dec 19 06:58:21.225 INFO [stderr] warning: variable `EXCHANGE_URL` should have a snake case name such as `exchange_url`
Dec 19 06:58:21.225 INFO [stderr]   --> src/websockets.rs:28:31
Dec 19 06:58:21.225 INFO [stderr]    |
Dec 19 06:58:21.225 INFO [stderr] 28 |     pub fn connect(&mut self, EXCHANGE_URL: &str) -> Result<()> {
Dec 19 06:58:21.225 INFO [stderr]    |                               ^^^^^^^^^^^^
Dec 19 06:58:21.225 INFO [stderr]    |
Dec 19 06:58:21.225 INFO [stderr]    = note: #[warn(non_snake_case)] on by default
Dec 19 06:58:21.225 INFO [stderr] 
Dec 19 06:58:21.258 INFO [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
Dec 19 06:58:21.258 INFO [stderr]   --> src/errors.rs:6:1
Dec 19 06:58:21.258 INFO [stderr]    |
Dec 19 06:58:21.258 INFO [stderr] 6  | / error_chain! {
Dec 19 06:58:21.258 INFO [stderr] 7  | |     types {
Dec 19 06:58:21.258 INFO [stderr] 8  | |         Error, ErrorKind, ResultExt, Result;
Dec 19 06:58:21.258 INFO [stderr] 9  | |     }
Dec 19 06:58:21.258 INFO [stderr] ...  |
Dec 19 06:58:21.258 INFO [stderr] 19 | |     }
Dec 19 06:58:21.258 INFO [stderr] 20 | | }
Dec 19 06:58:21.258 INFO [stderr]    | |_^
Dec 19 06:58:21.258 INFO [stderr]    |
Dec 19 06:58:21.258 INFO [stderr]    = note: #[warn(deprecated)] on by default
Dec 19 06:58:21.258 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 19 06:58:21.258 INFO [stderr] 
Dec 19 06:58:21.258 INFO [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
Dec 19 06:58:21.258 INFO [stderr]   --> src/errors.rs:6:1
Dec 19 06:58:21.258 INFO [stderr]    |
Dec 19 06:58:21.258 INFO [stderr] 6  | / error_chain! {
Dec 19 06:58:21.258 INFO [stderr] 7  | |     types {
Dec 19 06:58:21.258 INFO [stderr] 8  | |         Error, ErrorKind, ResultExt, Result;
Dec 19 06:58:21.258 INFO [stderr] 9  | |     }
Dec 19 06:58:21.258 INFO [stderr] ...  |
Dec 19 06:58:21.258 INFO [stderr] 19 | |     }
Dec 19 06:58:21.258 INFO [stderr] 20 | | }
Dec 19 06:58:21.258 INFO [stderr]    | |_^
Dec 19 06:58:21.258 INFO [stderr]    |
Dec 19 06:58:21.258 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 19 06:58:21.259 INFO [stderr] 
Dec 19 06:58:21.316 INFO [stderr] warning: unused variable: `msg`
Dec 19 06:58:21.316 INFO [stderr]   --> src/websockets.rs:50:20
Dec 19 06:58:21.316 INFO [stderr]    |
Dec 19 06:58:21.316 INFO [stderr] 50 |                 Ok(msg) => {
Dec 19 06:58:21.316 INFO [stderr]    |                    ^^^ help: consider using `_msg` instead
Dec 19 06:58:21.316 INFO [stderr]    |
Dec 19 06:58:21.316 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 06:58:21.316 INFO [stderr] 
Dec 19 06:58:21.316 INFO [stderr] warning: unused variable: `e`
Dec 19 06:58:21.316 INFO [stderr]   --> src/websockets.rs:53:21
Dec 19 06:58:21.316 INFO [stderr]    |
Dec 19 06:58:21.316 INFO [stderr] 53 |                 Err(e) => {
Dec 19 06:58:21.316 INFO [stderr]    |                     ^ help: consider using `_e` instead
Dec 19 06:58:21.316 INFO [stderr] 
Dec 19 06:58:21.316 INFO [stderr] warning: unused variable: `e`
Dec 19 06:58:21.316 INFO [stderr]   --> src/websockets.rs:72:21
Dec 19 06:58:21.317 INFO [stderr]    |
Dec 19 06:58:21.317 INFO [stderr] 72 |                 Err(e) => {
Dec 19 06:58:21.317 INFO [stderr]    |                     ^ help: consider using `_e` instead
Dec 19 06:58:21.317 INFO [stderr] 
Dec 19 06:58:21.511 INFO [stderr] warning: variable `EXCHANGE_URL` should have a snake case name such as `exchange_url`
Dec 19 06:58:21.511 INFO [stderr]   --> src/websockets.rs:28:31
Dec 19 06:58:21.511 INFO [stderr]    |
Dec 19 06:58:21.511 INFO [stderr] 28 |     pub fn connect(&mut self, EXCHANGE_URL: &str) -> Result<()> {
Dec 19 06:58:21.511 INFO [stderr]    |                               ^^^^^^^^^^^^
Dec 19 06:58:21.511 INFO [stderr]    |
Dec 19 06:58:21.511 INFO [stderr]    = note: #[warn(non_snake_case)] on by default
Dec 19 06:58:21.511 INFO [stderr] 
Dec 19 06:58:21.904 INFO [stderr] warning: unused variable: `e`
Dec 19 06:58:21.904 INFO [stderr]   --> src/main.rs:86:28
Dec 19 06:58:21.904 INFO [stderr]    |
Dec 19 06:58:21.904 INFO [stderr] 86 |                 if let Err(e) = okex_socket.fetch_message() {
Dec 19 06:58:21.904 INFO [stderr]    |                            ^ help: consider using `_e` instead
Dec 19 06:58:21.904 INFO [stderr]    |
Dec 19 06:58:21.904 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 06:58:21.904 INFO [stderr] 
Dec 19 06:58:21.904 INFO [stderr] warning: unused variable: `e`
Dec 19 06:58:21.904 INFO [stderr]   --> src/main.rs:99:28
Dec 19 06:58:21.904 INFO [stderr]    |
Dec 19 06:58:21.904 INFO [stderr] 99 |                 if let Err(e) = binance_socket.fetch_message() {
Dec 19 06:58:21.904 INFO [stderr]    |                            ^ help: consider using `_e` instead
Dec 19 06:58:21.904 INFO [stderr] 
Dec 19 06:58:21.904 INFO [stderr] warning: unused variable: `time`
Dec 19 06:58:21.904 INFO [stderr]    --> src/main.rs:112:17
Dec 19 06:58:21.904 INFO [stderr]     |
Dec 19 06:58:21.904 INFO [stderr] 112 |             let time = current_time.parse::<i32>().unwrap();
Dec 19 06:58:21.905 INFO [stderr]     |                 ^^^^ help: consider using `_time` instead
Dec 19 06:58:21.905 INFO [stderr] 
Dec 19 06:58:21.905 INFO [stderr] warning: unused variable: `time_exchange2`
Dec 19 06:58:21.905 INFO [stderr]    --> src/main.rs:144:21
Dec 19 06:58:21.905 INFO [stderr]     |
Dec 19 06:58:21.905 INFO [stderr] 144 |                 let time_exchange2 = String::from("");
Dec 19 06:58:21.905 INFO [stderr]     |                     ^^^^^^^^^^^^^^ help: consider using `_time_exchange2` instead
Dec 19 06:58:21.905 INFO [stderr] 
Dec 19 06:58:21.905 INFO [stderr] warning: unused variable: `time_exchange2_datetime_format`
Dec 19 06:58:21.905 INFO [stderr]    --> src/main.rs:145:21
Dec 19 06:58:21.905 INFO [stderr]     |
Dec 19 06:58:21.905 INFO [stderr] 145 |                 let time_exchange2_datetime_format = String::from("");
Dec 19 06:58:21.905 INFO [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `_time_exchange2_datetime_format` instead
Dec 19 06:58:21.905 INFO [stderr] 
Dec 19 06:58:21.928 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 06:58:21.928 INFO [stderr]   --> src/main.rs:72:21
Dec 19 06:58:21.928 INFO [stderr]    |
Dec 19 06:58:21.928 INFO [stderr] 72 |                     wtr.flush();
Dec 19 06:58:21.928 INFO [stderr]    |                     ^^^^^^^^^^^^
Dec 19 06:58:21.928 INFO [stderr]    |
Dec 19 06:58:21.928 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 06:58:21.928 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 06:58:21.928 INFO [stderr] 
Dec 19 06:58:22.056 INFO [stderr] warning: unused variable: `e`
Dec 19 06:58:22.056 INFO [stderr]   --> src/main.rs:86:28
Dec 19 06:58:22.056 INFO [stderr]    |
Dec 19 06:58:22.056 INFO [stderr] 86 |                 if let Err(e) = okex_socket.fetch_message() {
Dec 19 06:58:22.056 INFO [stderr]    |                            ^ help: consider using `_e` instead
Dec 19 06:58:22.056 INFO [stderr]    |
Dec 19 06:58:22.056 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 06:58:22.056 INFO [stderr] 
Dec 19 06:58:22.056 INFO [stderr] warning: unused variable: `e`
Dec 19 06:58:22.056 INFO [stderr]   --> src/main.rs:99:28
Dec 19 06:58:22.056 INFO [stderr]    |
Dec 19 06:58:22.056 INFO [stderr] 99 |                 if let Err(e) = binance_socket.fetch_message() {
Dec 19 06:58:22.056 INFO [stderr]    |                            ^ help: consider using `_e` instead
Dec 19 06:58:22.056 INFO [stderr] 
Dec 19 06:58:22.056 INFO [stderr] warning: unused variable: `time`
Dec 19 06:58:22.056 INFO [stderr]    --> src/main.rs:112:17
Dec 19 06:58:22.056 INFO [stderr]     |
Dec 19 06:58:22.056 INFO [stderr] 112 |             let time = current_time.parse::<i32>().unwrap();
Dec 19 06:58:22.056 INFO [stderr]     |                 ^^^^ help: consider using `_time` instead
Dec 19 06:58:22.056 INFO [stderr] 
Dec 19 06:58:22.056 INFO [stderr] warning: unused variable: `time_exchange2`
Dec 19 06:58:22.056 INFO [stderr]    --> src/main.rs:144:21
Dec 19 06:58:22.056 INFO [stderr]     |
Dec 19 06:58:22.056 INFO [stderr] 144 |                 let time_exchange2 = String::from("");
Dec 19 06:58:22.057 INFO [stderr]     |                     ^^^^^^^^^^^^^^ help: consider using `_time_exchange2` instead
Dec 19 06:58:22.057 INFO [stderr] 
Dec 19 06:58:22.057 INFO [stderr] warning: unused variable: `time_exchange2_datetime_format`
Dec 19 06:58:22.057 INFO [stderr]    --> src/main.rs:145:21
Dec 19 06:58:22.057 INFO [stderr]     |
Dec 19 06:58:22.057 INFO [stderr] 145 |                 let time_exchange2_datetime_format = String::from("");
Dec 19 06:58:22.057 INFO [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `_time_exchange2_datetime_format` instead
Dec 19 06:58:22.057 INFO [stderr] 
Dec 19 06:58:22.080 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 06:58:22.080 INFO [stderr]   --> src/main.rs:72:21
Dec 19 06:58:22.080 INFO [stderr]    |
Dec 19 06:58:22.080 INFO [stderr] 72 |                     wtr.flush();
Dec 19 06:58:22.080 INFO [stderr]    |                     ^^^^^^^^^^^^
Dec 19 06:58:22.080 INFO [stderr]    |
Dec 19 06:58:22.080 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 06:58:22.080 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 06:58:22.080 INFO [stderr] 
Dec 19 06:58:22.127 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 48.93s
Dec 19 06:58:22.884 INFO running `"docker" "inspect" "9b10e6db6471aaa8c659807986a080adbbc860e2c2065840381a6dd905e0d84d"`
Dec 19 06:58:23.188 INFO running `"docker" "rm" "-f" "9b10e6db6471aaa8c659807986a080adbbc860e2c2065840381a6dd905e0d84d"`
Dec 19 06:58:23.464 INFO [stdout] 9b10e6db6471aaa8c659807986a080adbbc860e2c2065840381a6dd905e0d84d