Dec 19 18:23:18.750 INFO checking daogangtang/learn-tokio against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 18:23:18.750 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-6/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/daogangtang/learn-tokio:/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 18:23:19.100 INFO [stdout] 6d92bd18b0aeac82cf0711cb6215c557ce28a477931059e4236f7bf987d52e60
Dec 19 18:23:19.102 INFO running `"docker" "start" "-a" "6d92bd18b0aeac82cf0711cb6215c557ce28a477931059e4236f7bf987d52e60"`
Dec 19 18:23:20.520 INFO [stderr]     Checking learn-tokio0 v0.1.0 (/opt/crater/workdir)
Dec 19 18:23:23.248 INFO [stderr] warning: unused import: `tokio::io`
Dec 19 18:23:23.248 INFO [stderr]  --> src/tcp_server.rs:5:5
Dec 19 18:23:23.248 INFO [stderr]   |
Dec 19 18:23:23.248 INFO [stderr] 5 | use tokio::io;
Dec 19 18:23:23.248 INFO [stderr]   |     ^^^^^^^^^
Dec 19 18:23:23.248 INFO [stderr]   |
Dec 19 18:23:23.248 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 18:23:23.248 INFO [stderr] 
Dec 19 18:23:23.516 INFO [stderr] warning: unused import: `tokio::io`
Dec 19 18:23:23.516 INFO [stderr]  --> src/tcp_server.rs:5:5
Dec 19 18:23:23.516 INFO [stderr]   |
Dec 19 18:23:23.516 INFO [stderr] 5 | use tokio::io;
Dec 19 18:23:23.516 INFO [stderr]   |     ^^^^^^^^^
Dec 19 18:23:23.516 INFO [stderr]   |
Dec 19 18:23:23.516 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 18:23:23.516 INFO [stderr] 
Dec 19 18:23:23.812 INFO [stderr] warning: unused import: `tokio::prelude`
Dec 19 18:23:23.812 INFO [stderr]  --> src/tcp_server.rs:7:5
Dec 19 18:23:23.812 INFO [stderr]   |
Dec 19 18:23:23.812 INFO [stderr] 7 | use tokio::prelude::*;
Dec 19 18:23:23.812 INFO [stderr]   |     ^^^^^^^^^^^^^^
Dec 19 18:23:23.836 INFO [stderr] 
Dec 19 18:23:23.836 INFO [stderr] warning: unused variable: `e`
Dec 19 18:23:23.836 INFO [stderr]   --> src/tcp_server.rs:37:31
Dec 19 18:23:23.836 INFO [stderr]    |
Dec 19 18:23:23.836 INFO [stderr] 37 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
Dec 19 18:23:23.836 INFO [stderr]    |                               ^ help: consider using `_e` instead
Dec 19 18:23:23.837 INFO [stderr]    |
Dec 19 18:23:23.837 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 18:23:23.837 INFO [stderr] 
Dec 19 18:23:23.928 INFO [stderr] warning: unused import: `tokio::prelude`
Dec 19 18:23:23.928 INFO [stderr]  --> src/tcp_server.rs:7:5
Dec 19 18:23:23.928 INFO [stderr]   |
Dec 19 18:23:23.928 INFO [stderr] 7 | use tokio::prelude::*;
Dec 19 18:23:23.928 INFO [stderr]   |     ^^^^^^^^^^^^^^
Dec 19 18:23:23.928 INFO [stderr] 
Dec 19 18:23:23.928 INFO [stderr] warning: unused variable: `e`
Dec 19 18:23:23.928 INFO [stderr]   --> src/tcp_server.rs:37:31
Dec 19 18:23:23.928 INFO [stderr]    |
Dec 19 18:23:23.928 INFO [stderr] 37 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
Dec 19 18:23:23.928 INFO [stderr]    |                               ^ help: consider using `_e` instead
Dec 19 18:23:23.928 INFO [stderr]    |
Dec 19 18:23:23.928 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 18:23:23.928 INFO [stderr] 
Dec 19 18:23:24.620 INFO [stderr] warning: unused variable: `e`
Dec 19 18:23:24.620 INFO [stderr]   --> src/tcp_server3.rs:29:31
Dec 19 18:23:24.620 INFO [stderr]    |
Dec 19 18:23:24.620 INFO [stderr] 29 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
Dec 19 18:23:24.620 INFO [stderr]    |                               ^ help: consider using `_e` instead
Dec 19 18:23:24.620 INFO [stderr]    |
Dec 19 18:23:24.620 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 18:23:24.620 INFO [stderr] 
Dec 19 18:23:25.252 INFO [stderr] warning: unused import: `futures::try_ready`
Dec 19 18:23:25.252 INFO [stderr]  --> src/concurrent_send_recv.rs:7:5
Dec 19 18:23:25.252 INFO [stderr]   |
Dec 19 18:23:25.252 INFO [stderr] 7 | use futures::try_ready;
Dec 19 18:23:25.252 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^
Dec 19 18:23:25.252 INFO [stderr]   |
Dec 19 18:23:25.252 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 18:23:25.252 INFO [stderr] 
Dec 19 18:23:26.785 INFO [stderr] warning: unused variable: `e`
Dec 19 18:23:26.788 INFO [stderr]   --> src/tcp_server3.rs:29:31
Dec 19 18:23:26.788 INFO [stderr]    |
Dec 19 18:23:26.788 INFO [stderr] 29 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
Dec 19 18:23:26.788 INFO [stderr]    |                               ^ help: consider using `_e` instead
Dec 19 18:23:26.788 INFO [stderr]    |
Dec 19 18:23:26.788 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 18:23:26.788 INFO [stderr] 
Dec 19 18:23:26.801 INFO [stderr] warning: unused import: `futures::try_ready`
Dec 19 18:23:26.801 INFO [stderr]  --> src/concurrent_send_recv.rs:7:5
Dec 19 18:23:26.801 INFO [stderr]   |
Dec 19 18:23:26.801 INFO [stderr] 7 | use futures::try_ready;
Dec 19 18:23:26.802 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^
Dec 19 18:23:26.802 INFO [stderr]   |
Dec 19 18:23:26.802 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 18:23:26.802 INFO [stderr] 
Dec 19 18:23:27.580 INFO [stderr] warning: unused import: `futures::try_ready`
Dec 19 18:23:27.580 INFO [stderr]  --> src/concurrent_send_recv2.rs:7:5
Dec 19 18:23:27.580 INFO [stderr]   |
Dec 19 18:23:27.580 INFO [stderr] 7 | use futures::try_ready;
Dec 19 18:23:27.580 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^
Dec 19 18:23:27.584 INFO [stderr] warning: unused import: `futures::try_ready`
Dec 19 18:23:27.585 INFO [stderr]  --> src/concurrent_send_recv2.rs:7:5
Dec 19 18:23:27.585 INFO [stderr]   |
Dec 19 18:23:27.585 INFO [stderr] 7 | use futures::try_ready;
Dec 19 18:23:27.585 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^
Dec 19 18:23:27.585 INFO [stderr]   |
Dec 19 18:23:27.585 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 18:23:27.585 INFO [stderr] 
Dec 19 18:23:27.612 INFO [stderr]   |
Dec 19 18:23:27.612 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 18:23:27.612 INFO [stderr] 
Dec 19 18:23:29.408 INFO [stderr] warning: unused variable: `stdout`
Dec 19 18:23:29.408 INFO [stderr]   --> src/tcp_client.rs:12:13
Dec 19 18:23:29.408 INFO [stderr]    |
Dec 19 18:23:29.408 INFO [stderr] 12 |     let mut stdout = io::stdout();
Dec 19 18:23:29.408 INFO [stderr]    |             ^^^^^^ help: consider using `_stdout` instead
Dec 19 18:23:29.420 INFO [stderr]    |
Dec 19 18:23:29.420 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 18:23:29.420 INFO [stderr] 
Dec 19 18:23:29.484 INFO [stderr] warning: variable does not need to be mutable
Dec 19 18:23:29.484 INFO [stderr]   --> src/tcp_client.rs:12:9
Dec 19 18:23:29.484 INFO [stderr]    |
Dec 19 18:23:29.484 INFO [stderr] 12 |     let mut stdout = io::stdout();
Dec 19 18:23:29.484 INFO [stderr]    |         ----^^^^^^
Dec 19 18:23:29.484 INFO [stderr]    |         |
Dec 19 18:23:29.484 INFO [stderr]    |         help: remove this `mut`
Dec 19 18:23:29.484 INFO [stderr]    |
Dec 19 18:23:29.484 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 18:23:29.484 INFO [stderr] 
Dec 19 18:23:29.729 INFO [stderr] warning: unused variable: `stdout`
Dec 19 18:23:29.729 INFO [stderr]   --> src/tcp_client.rs:12:13
Dec 19 18:23:29.730 INFO [stderr]    |
Dec 19 18:23:29.730 INFO [stderr] 12 |     let mut stdout = io::stdout();
Dec 19 18:23:29.730 INFO [stderr]    |             ^^^^^^ help: consider using `_stdout` instead
Dec 19 18:23:29.730 INFO [stderr]    |
Dec 19 18:23:29.730 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 18:23:29.730 INFO [stderr] 
Dec 19 18:23:29.772 INFO [stderr] warning: variable does not need to be mutable
Dec 19 18:23:29.772 INFO [stderr]   --> src/tcp_client.rs:12:9
Dec 19 18:23:29.772 INFO [stderr]    |
Dec 19 18:23:29.772 INFO [stderr] 12 |     let mut stdout = io::stdout();
Dec 19 18:23:29.772 INFO [stderr]    |         ----^^^^^^
Dec 19 18:23:29.772 INFO [stderr]    |         |
Dec 19 18:23:29.772 INFO [stderr]    |         help: remove this `mut`
Dec 19 18:23:29.772 INFO [stderr]    |
Dec 19 18:23:29.772 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 18:23:29.772 INFO [stderr] 
Dec 19 18:23:30.272 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.95s
Dec 19 18:23:30.803 INFO running `"docker" "inspect" "6d92bd18b0aeac82cf0711cb6215c557ce28a477931059e4236f7bf987d52e60"`
Dec 19 18:23:31.008 INFO running `"docker" "rm" "-f" "6d92bd18b0aeac82cf0711cb6215c557ce28a477931059e4236f7bf987d52e60"`
Dec 19 18:23:31.204 INFO [stdout] 6d92bd18b0aeac82cf0711cb6215c557ce28a477931059e4236f7bf987d52e60