[INFO] updating cached repository https://github.com/Takamichi-tsutsumi/pong
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2916eb982cbc13624f010d83588f026a36febd67
[INFO] checking Takamichi-tsutsumi/pong against master#c9edc02e8320a9e5799d185910ece7d491f524e6 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FTakamichi-tsutsumi%2Fpong" "work/builds/worker-7/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Takamichi-tsutsumi/pong on toolchain c9edc02e8320a9e5799d185910ece7d491f524e6-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/Takamichi-tsutsumi/pong
[INFO] finished tweaking git repo https://github.com/Takamichi-tsutsumi/pong
[INFO] tweaked toml for git repo https://github.com/Takamichi-tsutsumi/pong written to work/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/Takamichi-tsutsumi/pong already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] bcb6e522168b074704084497422a4ac4bbd83e55ccbfb5f3eb87650b118ef6b1
[INFO] running `"docker" "start" "-a" "bcb6e522168b074704084497422a4ac4bbd83e55ccbfb5f3eb87650b118ef6b1"`
[INFO] [stderr]     Checking pong v0.1.0 (/opt/rustwide/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 4.11s
[INFO] running `"docker" "inspect" "bcb6e522168b074704084497422a4ac4bbd83e55ccbfb5f3eb87650b118ef6b1"`
[INFO] running `"docker" "rm" "-f" "bcb6e522168b074704084497422a4ac4bbd83e55ccbfb5f3eb87650b118ef6b1"`
[INFO] [stdout] bcb6e522168b074704084497422a4ac4bbd83e55ccbfb5f3eb87650b118ef6b1