Dec 11 20:07:41.778 INFO checking daogangtang/learn-tokio against try#aa9aa79c3c583aab59ac9134542d60a780c35e2e for pr-56677
Dec 11 20:07:41.778 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-5/try#aa9aa79c3c583aab59ac9134542d60a780c35e2e:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-5/pr-56677/try#aa9aa79c3c583aab59ac9134542d60a780c35e2e:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +aa9aa79c3c583aab59ac9134542d60a780c35e2e-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 11 20:07:42.100 INFO [stdout] 259a426a0fe6e317c770690b0e737835bb2c14d29e3d84f9080bc7c30184d52b
Dec 11 20:07:42.108 INFO running `"docker" "start" "-a" "259a426a0fe6e317c770690b0e737835bb2c14d29e3d84f9080bc7c30184d52b"`
Dec 11 20:07:43.168 INFO [stderr] usermod: no changes
Dec 11 20:07:43.432 INFO [stderr]     Checking learn-tokio0 v0.1.0 (/source)
Dec 11 20:07:54.504 INFO [stderr] warning: unused variable: `stdout`
Dec 11 20:07:54.504 INFO [stderr]   --> src/tcp_client.rs:12:13
Dec 11 20:07:54.505 INFO [stderr]    |
Dec 11 20:07:54.505 INFO [stderr] 12 |     let mut stdout = io::stdout();
Dec 11 20:07:54.505 INFO [stderr]    |             ^^^^^^ help: consider using `_stdout` instead
Dec 11 20:07:54.505 INFO [stderr]    |
Dec 11 20:07:54.505 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 11 20:07:54.505 INFO [stderr] 
Dec 11 20:07:54.664 INFO [stderr] warning: variable does not need to be mutable
Dec 11 20:07:54.665 INFO [stderr]   --> src/tcp_client.rs:12:9
Dec 11 20:07:54.665 INFO [stderr]    |
Dec 11 20:07:54.665 INFO [stderr] 12 |     let mut stdout = io::stdout();
Dec 11 20:07:54.666 INFO [stderr]    |         ----^^^^^^
Dec 11 20:07:54.666 INFO [stderr]    |         |
Dec 11 20:07:54.667 INFO [stderr]    |         help: remove this `mut`
Dec 11 20:07:54.667 INFO [stderr]    |
Dec 11 20:07:54.667 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 11 20:07:54.668 INFO [stderr] 
Dec 11 20:07:54.828 INFO [stderr] warning: unused import: `futures::try_ready`
Dec 11 20:07:54.828 INFO [stderr]  --> src/concurrent_send_recv2.rs:7:5
Dec 11 20:07:54.828 INFO [stderr]   |
Dec 11 20:07:54.828 INFO [stderr] 7 | use futures::try_ready;
Dec 11 20:07:54.828 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^
Dec 11 20:07:54.828 INFO [stderr]   |
Dec 11 20:07:54.828 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 11 20:07:54.828 INFO [stderr] 
Dec 11 20:07:57.800 INFO [stderr] warning: unused import: `tokio::io`
Dec 11 20:07:57.801 INFO [stderr]  --> src/tcp_server.rs:5:5
Dec 11 20:07:57.801 INFO [stderr]   |
Dec 11 20:07:57.801 INFO [stderr] 5 | use tokio::io;
Dec 11 20:07:57.802 INFO [stderr]   |     ^^^^^^^^^
Dec 11 20:07:57.802 INFO [stderr]   |
Dec 11 20:07:57.802 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 11 20:07:57.802 INFO [stderr] 
Dec 11 20:07:58.100 INFO [stderr] warning: unused import: `tokio::prelude`
Dec 11 20:07:58.100 INFO [stderr]  --> src/tcp_server.rs:7:5
Dec 11 20:07:58.101 INFO [stderr]   |
Dec 11 20:07:58.101 INFO [stderr] 7 | use tokio::prelude::*;
Dec 11 20:07:58.101 INFO [stderr]   |     ^^^^^^^^^^^^^^
Dec 11 20:07:58.102 INFO [stderr] 
Dec 11 20:07:58.119 INFO [stderr] warning: unused variable: `e`
Dec 11 20:07:58.120 INFO [stderr]   --> src/tcp_server.rs:37:31
Dec 11 20:07:58.120 INFO [stderr]    |
Dec 11 20:07:58.120 INFO [stderr] 37 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
Dec 11 20:07:58.120 INFO [stderr]    |                               ^ help: consider using `_e` instead
Dec 11 20:07:58.121 INFO [stderr]    |
Dec 11 20:07:58.121 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 11 20:07:58.121 INFO [stderr] 
Dec 11 20:08:06.451 INFO [stderr] warning: unused variable: `e`
Dec 11 20:08:06.451 INFO [stderr]   --> src/tcp_server3.rs:29:31
Dec 11 20:08:06.451 INFO [stderr]    |
Dec 11 20:08:06.451 INFO [stderr] 29 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
Dec 11 20:08:06.452 INFO [stderr]    |                               ^ help: consider using `_e` instead
Dec 11 20:08:06.464 INFO [stderr]    |
Dec 11 20:08:06.464 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 11 20:08:06.464 INFO [stderr] 
Dec 11 20:08:08.285 INFO [stderr] warning: unused import: `futures::try_ready`
Dec 11 20:08:08.285 INFO [stderr]  --> src/concurrent_send_recv.rs:7:5
Dec 11 20:08:08.285 INFO [stderr]   |
Dec 11 20:08:08.285 INFO [stderr] 7 | use futures::try_ready;
Dec 11 20:08:08.286 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^
Dec 11 20:08:08.286 INFO [stderr]   |
Dec 11 20:08:08.286 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 11 20:08:08.286 INFO [stderr] 
Dec 11 20:08:09.757 INFO [stderr] warning: unused variable: `stdout`
Dec 11 20:08:09.757 INFO [stderr]   --> src/tcp_client.rs:12:13
Dec 11 20:08:09.757 INFO [stderr]    |
Dec 11 20:08:09.757 INFO [stderr] 12 |     let mut stdout = io::stdout();
Dec 11 20:08:09.757 INFO [stderr]    |             ^^^^^^ help: consider using `_stdout` instead
Dec 11 20:08:09.757 INFO [stderr]    |
Dec 11 20:08:09.757 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 11 20:08:09.757 INFO [stderr] 
Dec 11 20:08:09.792 INFO [stderr] warning: variable does not need to be mutable
Dec 11 20:08:09.792 INFO [stderr]   --> src/tcp_client.rs:12:9
Dec 11 20:08:09.792 INFO [stderr]    |
Dec 11 20:08:09.792 INFO [stderr] 12 |     let mut stdout = io::stdout();
Dec 11 20:08:09.792 INFO [stderr]    |         ----^^^^^^
Dec 11 20:08:09.792 INFO [stderr]    |         |
Dec 11 20:08:09.792 INFO [stderr]    |         help: remove this `mut`
Dec 11 20:08:09.792 INFO [stderr]    |
Dec 11 20:08:09.792 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 11 20:08:09.792 INFO [stderr] 
Dec 11 20:08:14.065 INFO [stderr] warning: unused import: `futures::try_ready`
Dec 11 20:08:14.065 INFO [stderr]  --> src/concurrent_send_recv.rs:7:5
Dec 11 20:08:14.065 INFO [stderr]   |
Dec 11 20:08:14.065 INFO [stderr] 7 | use futures::try_ready;
Dec 11 20:08:14.065 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^
Dec 11 20:08:14.065 INFO [stderr]   |
Dec 11 20:08:14.065 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 11 20:08:14.065 INFO [stderr] 
Dec 11 20:08:15.638 INFO [stderr] warning: unused variable: `e`
Dec 11 20:08:15.638 INFO [stderr]   --> src/tcp_server3.rs:29:31
Dec 11 20:08:15.639 INFO [stderr]    |
Dec 11 20:08:15.639 INFO [stderr] 29 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
Dec 11 20:08:15.639 INFO [stderr]    |                               ^ help: consider using `_e` instead
Dec 11 20:08:15.644 INFO [stderr]    |
Dec 11 20:08:15.644 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 11 20:08:15.644 INFO [stderr] 
Dec 11 20:08:16.123 INFO [stderr] warning: unused import: `futures::try_ready`
Dec 11 20:08:16.123 INFO [stderr]  --> src/concurrent_send_recv2.rs:7:5
Dec 11 20:08:16.123 INFO [stderr]   |
Dec 11 20:08:16.123 INFO [stderr] 7 | use futures::try_ready;
Dec 11 20:08:16.123 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^
Dec 11 20:08:16.136 INFO [stderr]   |
Dec 11 20:08:16.136 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 11 20:08:16.136 INFO [stderr] 
Dec 11 20:08:16.436 INFO [stderr] warning: unused import: `tokio::io`
Dec 11 20:08:16.436 INFO [stderr]  --> src/tcp_server.rs:5:5
Dec 11 20:08:16.436 INFO [stderr]   |
Dec 11 20:08:16.436 INFO [stderr] 5 | use tokio::io;
Dec 11 20:08:16.436 INFO [stderr]   |     ^^^^^^^^^
Dec 11 20:08:16.436 INFO [stderr]   |
Dec 11 20:08:16.436 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 11 20:08:16.436 INFO [stderr] 
Dec 11 20:08:16.660 INFO [stderr] warning: unused import: `tokio::prelude`
Dec 11 20:08:16.660 INFO [stderr]  --> src/tcp_server.rs:7:5
Dec 11 20:08:16.660 INFO [stderr]   |
Dec 11 20:08:16.660 INFO [stderr] 7 | use tokio::prelude::*;
Dec 11 20:08:16.660 INFO [stderr]   |     ^^^^^^^^^^^^^^
Dec 11 20:08:16.660 INFO [stderr] 
Dec 11 20:08:16.662 INFO [stderr] warning: unused variable: `e`
Dec 11 20:08:16.662 INFO [stderr]   --> src/tcp_server.rs:37:31
Dec 11 20:08:16.662 INFO [stderr]    |
Dec 11 20:08:16.662 INFO [stderr] 37 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
Dec 11 20:08:16.663 INFO [stderr]    |                               ^ help: consider using `_e` instead
Dec 11 20:08:16.663 INFO [stderr]    |
Dec 11 20:08:16.663 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 11 20:08:16.663 INFO [stderr] 
Dec 11 20:08:16.716 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 33.49s
Dec 11 20:08:16.737 INFO [stderr] su: No module specific data is present
Dec 11 20:08:17.290 INFO running `"docker" "inspect" "259a426a0fe6e317c770690b0e737835bb2c14d29e3d84f9080bc7c30184d52b"`
Dec 11 20:08:17.525 INFO running `"docker" "rm" "-f" "259a426a0fe6e317c770690b0e737835bb2c14d29e3d84f9080bc7c30184d52b"`
Dec 11 20:08:17.767 INFO [stdout] 259a426a0fe6e317c770690b0e737835bb2c14d29e3d84f9080bc7c30184d52b