[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-60039/sources/master#efe2f32a6b8217425f361ec7c206910c611c03ee/gh/Takamichi-tsutsumi/pong"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039/sources/master#efe2f32a6b8217425f361ec7c206910c611c03ee/gh/Takamichi-tsutsumi/pong'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Takamichi-tsutsumi/pong" "work/ex/pr-60039/sources/try#78b0bd8441ef961f6475e3d47fe3bca38cb83432/gh/Takamichi-tsutsumi/pong"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039/sources/try#78b0bd8441ef961f6475e3d47fe3bca38cb83432/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#efe2f32a6b8217425f361ec7c206910c611c03ee
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+efe2f32a6b8217425f361ec7c206910c611c03ee-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Takamichi-tsutsumi/pong on toolchain try#78b0bd8441ef961f6475e3d47fe3bca38cb83432
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+78b0bd8441ef961f6475e3d47fe3bca38cb83432-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-60039/sources/master#efe2f32a6b8217425f361ec7c206910c611c03ee/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-60039/sources/try#78b0bd8441ef961f6475e3d47fe3bca38cb83432/gh/Takamichi-tsutsumi/pong/Cargo.toml
[INFO] crate Takamichi-tsutsumi/pong already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+efe2f32a6b8217425f361ec7c206910c611c03ee-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+78b0bd8441ef961f6475e3d47fe3bca38cb83432-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking Takamichi-tsutsumi/pong against master#efe2f32a6b8217425f361ec7c206910c611c03ee for pr-60039
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-60039/worker-5/master#efe2f32a6b8217425f361ec7c206910c611c03ee:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-60039/sources/master#efe2f32a6b8217425f361ec7c206910c611c03ee/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" "+efe2f32a6b8217425f361ec7c206910c611c03ee-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 8031d0f4cb67520e8a17fcd837bcaf5023b52feee52f3dfa34734d1301009fb3
[INFO] running `"docker" "start" "-a" "8031d0f4cb67520e8a17fcd837bcaf5023b52feee52f3dfa34734d1301009fb3"`
[INFO] [stderr]     Checking unicode-bidi v0.3.2
[INFO] [stderr]     Checking num_cpus v1.4.0
[INFO] [stderr]     Checking mime v0.2.4
[INFO] [stderr]     Checking idna v0.1.2
[INFO] [stderr]     Checking url v1.4.0
[INFO] [stderr]     Checking hyper v0.10.10
[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 prefixing with an underscore: `_rx`
[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 prefixing with an underscore: `_req`
[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 prefixing with an underscore: `_rx`
[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 prefixing with an underscore: `_req`
[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 9.79s
[INFO] running `"docker" "inspect" "8031d0f4cb67520e8a17fcd837bcaf5023b52feee52f3dfa34734d1301009fb3"`
[INFO] running `"docker" "rm" "-f" "8031d0f4cb67520e8a17fcd837bcaf5023b52feee52f3dfa34734d1301009fb3"`
[INFO] [stdout] 8031d0f4cb67520e8a17fcd837bcaf5023b52feee52f3dfa34734d1301009fb3