[INFO] updating cached repository daogangtang/learn-tokio
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/daogangtang/learn-tokio
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/daogangtang/learn-tokio" "work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/daogangtang/learn-tokio"`
[INFO] [stderr] Cloning into 'work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/daogangtang/learn-tokio'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/daogangtang/learn-tokio" "work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/daogangtang/learn-tokio"`
[INFO] [stderr] Cloning into 'work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/daogangtang/learn-tokio'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 98b13be0e474ffb1b6a4f84b3e9caa91d100296a
[INFO] sha for GitHub repo daogangtang/learn-tokio: 98b13be0e474ffb1b6a4f84b3e9caa91d100296a
[INFO] validating manifest of daogangtang/learn-tokio on toolchain master#0f88167f89fffe321590c5148f21b7d51d44388d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of daogangtang/learn-tokio on toolchain try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing daogangtang/learn-tokio
[INFO] finished frobbing daogangtang/learn-tokio
[INFO] frobbed toml for daogangtang/learn-tokio written to work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/daogangtang/learn-tokio/Cargo.toml
[INFO] started frobbing daogangtang/learn-tokio
[INFO] finished frobbing daogangtang/learn-tokio
[INFO] frobbed toml for daogangtang/learn-tokio written to work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/daogangtang/learn-tokio/Cargo.toml
[INFO] crate daogangtang/learn-tokio already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking daogangtang/learn-tokio against try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b for pr-58948
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-58948/worker-1/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/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" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 44c1433e1a22365093b559d3115a19583f18d154cd7d19cc642898bae5b7477f
[INFO] running `"docker" "start" "-a" "44c1433e1a22365093b559d3115a19583f18d154cd7d19cc642898bae5b7477f"`
[INFO] [stderr]     Checking learn-tokio0 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `tokio::io`
[INFO] [stderr]  --> src/tcp_server.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use tokio::io;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `tokio::prelude`
[INFO] [stderr]  --> src/tcp_server.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use tokio::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]   --> src/tcp_server.rs:37:31
[INFO] [stderr]    |
[INFO] [stderr] 37 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
[INFO] [stderr]    |                               ^ help: consider prefixing with an underscore: `_e`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `futures::try_ready`
[INFO] [stderr]  --> src/concurrent_send_recv.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use futures::try_ready;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `futures::try_ready`
[INFO] [stderr]  --> src/concurrent_send_recv2.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use futures::try_ready;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]   --> src/tcp_server3.rs:29:31
[INFO] [stderr]    |
[INFO] [stderr] 29 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
[INFO] [stderr]    |                               ^ help: consider prefixing with an underscore: `_e`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]   --> src/tcp_server3.rs:29:31
[INFO] [stderr]    |
[INFO] [stderr] 29 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
[INFO] [stderr]    |                               ^ help: consider prefixing with an underscore: `_e`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `futures::try_ready`
[INFO] [stderr]  --> src/concurrent_send_recv2.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use futures::try_ready;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `stdout`
[INFO] [stderr]   --> src/tcp_client.rs:12:13
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let mut stdout = io::stdout();
[INFO] [stderr]    |             ^^^^^^ help: consider prefixing with an underscore: `_stdout`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/tcp_client.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let mut stdout = io::stdout();
[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: unused variable: `stdout`
[INFO] [stderr]   --> src/tcp_client.rs:12:13
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let mut stdout = io::stdout();
[INFO] [stderr]    |             ^^^^^^ help: consider prefixing with an underscore: `_stdout`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `tokio::io`
[INFO] [stderr]  --> src/tcp_server.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use tokio::io;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/tcp_client.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let mut stdout = io::stdout();
[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: unused import: `tokio::prelude`
[INFO] [stderr]  --> src/tcp_server.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use tokio::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]   --> src/tcp_server.rs:37:31
[INFO] [stderr]    |
[INFO] [stderr] 37 |                     .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, "oh no!"))
[INFO] [stderr]    |                               ^ help: consider prefixing with an underscore: `_e`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `futures::try_ready`
[INFO] [stderr]  --> src/concurrent_send_recv.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use futures::try_ready;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.35s
[INFO] running `"docker" "inspect" "44c1433e1a22365093b559d3115a19583f18d154cd7d19cc642898bae5b7477f"`
[INFO] running `"docker" "rm" "-f" "44c1433e1a22365093b559d3115a19583f18d154cd7d19cc642898bae5b7477f"`
[INFO] [stdout] 44c1433e1a22365093b559d3115a19583f18d154cd7d19cc642898bae5b7477f