Dec 19 18:23:18.716 INFO checking daogangtang/learn-tokio against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
Dec 19 18:23:18.716 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-7/try#e70472fc501b855c9080f3772432c10fe20b8866:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/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" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 18:23:19.027 INFO [stdout] 5bdf83f4e530d4f096f25f64e46e516d9006eeecca43f058f727a921301b158f
Dec 19 18:23:19.030 INFO running `"docker" "start" "-a" "5bdf83f4e530d4f096f25f64e46e516d9006eeecca43f058f727a921301b158f"`
Dec 19 18:23:20.476 INFO [stderr]     Checking learn-tokio0 v0.1.0 (/opt/crater/workdir)
Dec 19 18:23:22.784 INFO [stderr] warning: unused import: `futures::try_ready`
Dec 19 18:23:22.784 INFO [stderr]  --> src/concurrent_send_recv.rs:7:5
Dec 19 18:23:22.784 INFO [stderr]   |
Dec 19 18:23:22.784 INFO [stderr] 7 | use futures::try_ready;
Dec 19 18:23:22.784 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^
Dec 19 18:23:22.784 INFO [stderr]   |
Dec 19 18:23:22.784 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 18:23:22.784 INFO [stderr] 
Dec 19 18:23:22.914 INFO [stderr] warning: unused variable: `stdout`
Dec 19 18:23:22.914 INFO [stderr]   --> src/tcp_client.rs:12:13
Dec 19 18:23:22.914 INFO [stderr]    |
Dec 19 18:23:22.914 INFO [stderr] 12 |     let mut stdout = io::stdout();
Dec 19 18:23:22.914 INFO [stderr]    |             ^^^^^^ help: consider using `_stdout` instead
Dec 19 18:23:22.928 INFO [stderr]    |
Dec 19 18:23:22.928 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 18:23:22.928 INFO [stderr] 
Dec 19 18:23:22.984 INFO [stderr] warning: variable does not need to be mutable
Dec 19 18:23:22.984 INFO [stderr]   --> src/tcp_client.rs:12:9
Dec 19 18:23:22.984 INFO [stderr]    |
Dec 19 18:23:22.984 INFO [stderr] 12 |     let mut stdout = io::stdout();
Dec 19 18:23:22.984 INFO [stderr]    |         ----^^^^^^
Dec 19 18:23:22.984 INFO [stderr]    |         |
Dec 19 18:23:22.984 INFO [stderr]    |         help: remove this `mut`
Dec 19 18:23:22.993 INFO [stderr]    |
Dec 19 18:23:22.993 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 18:23:22.993 INFO [stderr] 
Dec 19 18:23:23.076 INFO [stderr] warning: unused import: `futures::try_ready`
Dec 19 18:23:23.076 INFO [stderr]  --> src/concurrent_send_recv2.rs:7:5
Dec 19 18:23:23.076 INFO [stderr]   |
Dec 19 18:23:23.076 INFO [stderr] 7 | use futures::try_ready;
Dec 19 18:23:23.076 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^
Dec 19 18:23:23.076 INFO [stderr]   |
Dec 19 18:23:23.076 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 18:23:23.076 INFO [stderr] 
Dec 19 18:23:23.420 INFO [stderr] warning: unused variable: `e`
Dec 19 18:23:23.420 INFO [stderr]   --> src/tcp_server3.rs:29:31
Dec 19 18:23:23.420 INFO [stderr]    |
Dec 19 18:23:23.420 INFO [stderr] 29 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
Dec 19 18:23:23.420 INFO [stderr]    |                               ^ help: consider using `_e` instead
Dec 19 18:23:23.420 INFO [stderr]    |
Dec 19 18:23:23.420 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 18:23:23.420 INFO [stderr] 
Dec 19 18:23:26.216 INFO [stderr] warning: unused import: `futures::try_ready`
Dec 19 18:23:26.216 INFO [stderr]  --> src/concurrent_send_recv.rs:7:5
Dec 19 18:23:26.216 INFO [stderr]   |
Dec 19 18:23:26.216 INFO [stderr] 7 | use futures::try_ready;
Dec 19 18:23:26.216 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^
Dec 19 18:23:26.216 INFO [stderr]   |
Dec 19 18:23:26.216 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 18:23:26.216 INFO [stderr] 
Dec 19 18:23:26.245 INFO [stderr] warning: unused variable: `e`
Dec 19 18:23:26.245 INFO [stderr]   --> src/tcp_server3.rs:29:31
Dec 19 18:23:26.245 INFO [stderr]    |
Dec 19 18:23:26.245 INFO [stderr] 29 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
Dec 19 18:23:26.245 INFO [stderr]    |                               ^ help: consider using `_e` instead
Dec 19 18:23:26.245 INFO [stderr]    |
Dec 19 18:23:26.245 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 18:23:26.245 INFO [stderr] 
Dec 19 18:23:26.322 INFO [stderr] warning: unused import: `tokio::io`
Dec 19 18:23:26.322 INFO [stderr]  --> src/tcp_server.rs:5:5
Dec 19 18:23:26.322 INFO [stderr]   |
Dec 19 18:23:26.322 INFO [stderr] 5 | use tokio::io;
Dec 19 18:23:26.322 INFO [stderr]   |     ^^^^^^^^^
Dec 19 18:23:26.322 INFO [stderr]   |
Dec 19 18:23:26.322 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 18:23:26.322 INFO [stderr] 
Dec 19 18:23:26.364 INFO [stderr] warning: unused import: `futures::try_ready`
Dec 19 18:23:26.364 INFO [stderr]  --> src/concurrent_send_recv2.rs:7:5
Dec 19 18:23:26.364 INFO [stderr]   |
Dec 19 18:23:26.364 INFO [stderr] 7 | use futures::try_ready;
Dec 19 18:23:26.364 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^
Dec 19 18:23:26.364 INFO [stderr]   |
Dec 19 18:23:26.365 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 18:23:26.365 INFO [stderr] 
Dec 19 18:23:26.530 INFO [stderr] warning: unused import: `tokio::prelude`
Dec 19 18:23:26.531 INFO [stderr]  --> src/tcp_server.rs:7:5
Dec 19 18:23:26.531 INFO [stderr]   |
Dec 19 18:23:26.531 INFO [stderr] 7 | use tokio::prelude::*;
Dec 19 18:23:26.531 INFO [stderr]   |     ^^^^^^^^^^^^^^
Dec 19 18:23:26.531 INFO [stderr] 
Dec 19 18:23:26.562 INFO [stderr] warning: unused variable: `e`
Dec 19 18:23:26.562 INFO [stderr]   --> src/tcp_server.rs:37:31
Dec 19 18:23:26.562 INFO [stderr]    |
Dec 19 18:23:26.563 INFO [stderr] 37 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
Dec 19 18:23:26.563 INFO [stderr]    |                               ^ help: consider using `_e` instead
Dec 19 18:23:26.563 INFO [stderr]    |
Dec 19 18:23:26.563 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 18:23:26.566 INFO [stderr] 
Dec 19 18:23:27.744 INFO [stderr] warning: unused import: `tokio::io`
Dec 19 18:23:27.744 INFO [stderr]  --> src/tcp_server.rs:5:5
Dec 19 18:23:27.744 INFO [stderr]   |
Dec 19 18:23:27.744 INFO [stderr] 5 | use tokio::io;
Dec 19 18:23:27.744 INFO [stderr]   |     ^^^^^^^^^
Dec 19 18:23:27.744 INFO [stderr]   |
Dec 19 18:23:27.744 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 18:23:27.744 INFO [stderr] 
Dec 19 18:23:27.876 INFO [stderr] warning: unused import: `tokio::prelude`
Dec 19 18:23:27.876 INFO [stderr]  --> src/tcp_server.rs:7:5
Dec 19 18:23:27.876 INFO [stderr]   |
Dec 19 18:23:27.876 INFO [stderr] 7 | use tokio::prelude::*;
Dec 19 18:23:27.876 INFO [stderr]   |     ^^^^^^^^^^^^^^
Dec 19 18:23:27.876 INFO [stderr] 
Dec 19 18:23:27.876 INFO [stderr] warning: unused variable: `e`
Dec 19 18:23:27.876 INFO [stderr]   --> src/tcp_server.rs:37:31
Dec 19 18:23:27.876 INFO [stderr]    |
Dec 19 18:23:27.876 INFO [stderr] 37 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
Dec 19 18:23:27.876 INFO [stderr]    |                               ^ help: consider using `_e` instead
Dec 19 18:23:27.876 INFO [stderr]    |
Dec 19 18:23:27.876 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 18:23:27.876 INFO [stderr] 
Dec 19 18:23:28.389 INFO [stderr] warning: unused variable: `stdout`
Dec 19 18:23:28.389 INFO [stderr]   --> src/tcp_client.rs:12:13
Dec 19 18:23:28.389 INFO [stderr]    |
Dec 19 18:23:28.389 INFO [stderr] 12 |     let mut stdout = io::stdout();
Dec 19 18:23:28.389 INFO [stderr]    |             ^^^^^^ help: consider using `_stdout` instead
Dec 19 18:23:28.389 INFO [stderr]    |
Dec 19 18:23:28.389 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 18:23:28.389 INFO [stderr] 
Dec 19 18:23:28.414 INFO [stderr] warning: variable does not need to be mutable
Dec 19 18:23:28.414 INFO [stderr]   --> src/tcp_client.rs:12:9
Dec 19 18:23:28.414 INFO [stderr]    |
Dec 19 18:23:28.414 INFO [stderr] 12 |     let mut stdout = io::stdout();
Dec 19 18:23:28.414 INFO [stderr]    |         ----^^^^^^
Dec 19 18:23:28.414 INFO [stderr]    |         |
Dec 19 18:23:28.414 INFO [stderr]    |         help: remove this `mut`
Dec 19 18:23:28.414 INFO [stderr]    |
Dec 19 18:23:28.414 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 18:23:28.414 INFO [stderr] 
Dec 19 18:23:28.682 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.35s
Dec 19 18:23:29.474 INFO running `"docker" "inspect" "5bdf83f4e530d4f096f25f64e46e516d9006eeecca43f058f727a921301b158f"`
Dec 19 18:23:29.690 INFO running `"docker" "rm" "-f" "5bdf83f4e530d4f096f25f64e46e516d9006eeecca43f058f727a921301b158f"`
Dec 19 18:23:29.945 INFO [stdout] 5bdf83f4e530d4f096f25f64e46e516d9006eeecca43f058f727a921301b158f