[INFO] updating cached repository Takamichi-tsutsumi/pong
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Takamichi-tsutsumi/pong
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Takamichi-tsutsumi/pong" "work/ex/pr-57617/sources/master#e2f221c75932de7a29845c8d6f1f73536ad00c41/gh/Takamichi-tsutsumi/pong"`
[INFO] [stderr] Cloning into 'work/ex/pr-57617/sources/master#e2f221c75932de7a29845c8d6f1f73536ad00c41/gh/Takamichi-tsutsumi/pong'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Takamichi-tsutsumi/pong" "work/ex/pr-57617/sources/try#0bfb90d213a93e466b33d078a5b535a2a6f9c5ff/gh/Takamichi-tsutsumi/pong"`
[INFO] [stderr] Cloning into 'work/ex/pr-57617/sources/try#0bfb90d213a93e466b33d078a5b535a2a6f9c5ff/gh/Takamichi-tsutsumi/pong'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2916eb982cbc13624f010d83588f026a36febd67
[INFO] sha for GitHub repo Takamichi-tsutsumi/pong: 2916eb982cbc13624f010d83588f026a36febd67
[INFO] validating manifest of Takamichi-tsutsumi/pong on toolchain master#e2f221c75932de7a29845c8d6f1f73536ad00c41
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e2f221c75932de7a29845c8d6f1f73536ad00c41-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Takamichi-tsutsumi/pong on toolchain try#0bfb90d213a93e466b33d078a5b535a2a6f9c5ff
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0bfb90d213a93e466b33d078a5b535a2a6f9c5ff-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Takamichi-tsutsumi/pong
[INFO] finished frobbing Takamichi-tsutsumi/pong
[INFO] frobbed toml for Takamichi-tsutsumi/pong written to work/ex/pr-57617/sources/master#e2f221c75932de7a29845c8d6f1f73536ad00c41/gh/Takamichi-tsutsumi/pong/Cargo.toml
[INFO] started frobbing Takamichi-tsutsumi/pong
[INFO] finished frobbing Takamichi-tsutsumi/pong
[INFO] frobbed toml for Takamichi-tsutsumi/pong written to work/ex/pr-57617/sources/try#0bfb90d213a93e466b33d078a5b535a2a6f9c5ff/gh/Takamichi-tsutsumi/pong/Cargo.toml
[INFO] crate Takamichi-tsutsumi/pong has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e2f221c75932de7a29845c8d6f1f73536ad00c41-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0bfb90d213a93e466b33d078a5b535a2a6f9c5ff-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking Takamichi-tsutsumi/pong against try#0bfb90d213a93e466b33d078a5b535a2a6f9c5ff for pr-57617
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57617/worker-6/try#0bfb90d213a93e466b33d078a5b535a2a6f9c5ff:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57617/sources/try#0bfb90d213a93e466b33d078a5b535a2a6f9c5ff/gh/Takamichi-tsutsumi/pong:/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" "+0bfb90d213a93e466b33d078a5b535a2a6f9c5ff-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] c044b12c5e8d774572678ab0cf2b08e64bee24f0416b2a036ffdd9bf33fbf2af
[INFO] running `"docker" "start" "-a" "c044b12c5e8d774572678ab0cf2b08e64bee24f0416b2a036ffdd9bf33fbf2af"`
[INFO] [stderr]     Checking unicode-bidi v0.3.2
[INFO] [stderr]     Checking mime v0.2.4
[INFO] [stderr]    Compiling hyper v0.10.10
[INFO] [stderr]     Checking idna v0.1.2
[INFO] [stderr]     Checking url v1.4.0
[INFO] [stderr]     Checking pong v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `rx`
[INFO] [stderr]   --> src/main.rs:25:14
[INFO] [stderr]    |
[INFO] [stderr] 25 |     let (tx, rx) = channel();
[INFO] [stderr]    |              ^^ help: consider using `_rx` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `req`
[INFO] [stderr]   --> src/main.rs:13:22
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn handle(&self, req: Request, mut res: Response) {
[INFO] [stderr]    |                      ^^^ help: consider using `_req` instead
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:13:36
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn handle(&self, req: Request, mut res: Response) {
[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: `rx`
[INFO] [stderr]   --> src/main.rs:25:14
[INFO] [stderr]    |
[INFO] [stderr] 25 |     let (tx, rx) = channel();
[INFO] [stderr]    |              ^^ help: consider using `_rx` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `req`
[INFO] [stderr]   --> src/main.rs:13:22
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn handle(&self, req: Request, mut res: Response) {
[INFO] [stderr]    |                      ^^^ help: consider using `_req` instead
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:13:36
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn handle(&self, req: Request, mut res: Response) {
[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]     Finished dev [unoptimized + debuginfo] target(s) in 8.53s
[INFO] running `"docker" "inspect" "c044b12c5e8d774572678ab0cf2b08e64bee24f0416b2a036ffdd9bf33fbf2af"`
[INFO] running `"docker" "rm" "-f" "c044b12c5e8d774572678ab0cf2b08e64bee24f0416b2a036ffdd9bf33fbf2af"`
[INFO] [stdout] c044b12c5e8d774572678ab0cf2b08e64bee24f0416b2a036ffdd9bf33fbf2af