[INFO] updating cached repository gannonchan/var_study
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/gannonchan/var_study
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/gannonchan/var_study" "work/ex/pr-57745/sources/master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039/gh/gannonchan/var_study"`
[INFO] [stderr] Cloning into 'work/ex/pr-57745/sources/master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039/gh/gannonchan/var_study'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/gannonchan/var_study" "work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/gannonchan/var_study"`
[INFO] [stderr] Cloning into 'work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/gannonchan/var_study'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c4cb9303acf58bb7cb704d18f51352c088211811
[INFO] sha for GitHub repo gannonchan/var_study: c4cb9303acf58bb7cb704d18f51352c088211811
[INFO] validating manifest of gannonchan/var_study on toolchain master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+f613dc138b4012cf3d2eb40718fbcc7cf0a34039-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of gannonchan/var_study on toolchain try#29640c57b5f92febba0e40c50cb863c9a7ede51d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+29640c57b5f92febba0e40c50cb863c9a7ede51d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing gannonchan/var_study
[INFO] finished frobbing gannonchan/var_study
[INFO] frobbed toml for gannonchan/var_study written to work/ex/pr-57745/sources/master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039/gh/gannonchan/var_study/Cargo.toml
[INFO] started frobbing gannonchan/var_study
[INFO] finished frobbing gannonchan/var_study
[INFO] frobbed toml for gannonchan/var_study written to work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/gannonchan/var_study/Cargo.toml
[INFO] crate gannonchan/var_study has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+f613dc138b4012cf3d2eb40718fbcc7cf0a34039-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+29640c57b5f92febba0e40c50cb863c9a7ede51d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking gannonchan/var_study against try#29640c57b5f92febba0e40c50cb863c9a7ede51d for pr-57745
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57745/worker-3/try#29640c57b5f92febba0e40c50cb863c9a7ede51d:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/gannonchan/var_study:/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" "+29640c57b5f92febba0e40c50cb863c9a7ede51d-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] c1318aec68831681d88b35ad7b2d4b59a99a45efccceef2107363d8caa3df359
[INFO] running `"docker" "start" "-a" "c1318aec68831681d88b35ad7b2d4b59a99a45efccceef2107363d8caa3df359"`
[INFO] [stderr]     Checking var_study v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `first_name`
[INFO] [stderr]   --> src/main.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 |     let first_name = String::from("0");
[INFO] [stderr]    |         ^^^^^^^^^^ help: consider using `_first_name` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `last_name`
[INFO] [stderr]   --> src/main.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let last_name = String::from("张三");
[INFO] [stderr]    |         ^^^^^^^^^ help: consider using `_last_name` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/main.rs:73:9
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let f = match f {   //使用match判断打开文件是否出现错误
[INFO] [stderr]    |         ^ help: consider using `_f` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/main.rs:95:9
[INFO] [stderr]    |
[INFO] [stderr] 95 |     let f = File::open("d:\\hello.txt").unwrap();
[INFO] [stderr]    |         ^ help: consider using `_f` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/main.rs:97:9
[INFO] [stderr]    |
[INFO] [stderr] 97 |     let f = File::open("d:\\hello.txt").expect("打开文件发生错误！");
[INFO] [stderr]    |         ^ help: consider using `_f` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `first_name`
[INFO] [stderr]   --> src/main.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 |     let first_name = String::from("0");
[INFO] [stderr]    |         ^^^^^^^^^^ help: consider using `_first_name` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `last_name`
[INFO] [stderr]   --> src/main.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let last_name = String::from("张三");
[INFO] [stderr]    |         ^^^^^^^^^ help: consider using `_last_name` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/main.rs:73:9
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let f = match f {   //使用match判断打开文件是否出现错误
[INFO] [stderr]    |         ^ help: consider using `_f` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/main.rs:95:9
[INFO] [stderr]    |
[INFO] [stderr] 95 |     let f = File::open("d:\\hello.txt").unwrap();
[INFO] [stderr]    |         ^ help: consider using `_f` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/main.rs:97:9
[INFO] [stderr]    |
[INFO] [stderr] 97 |     let f = File::open("d:\\hello.txt").expect("打开文件发生错误！");
[INFO] [stderr]    |         ^ help: consider using `_f` instead
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.77s
[INFO] running `"docker" "inspect" "c1318aec68831681d88b35ad7b2d4b59a99a45efccceef2107363d8caa3df359"`
[INFO] running `"docker" "rm" "-f" "c1318aec68831681d88b35ad7b2d4b59a99a45efccceef2107363d8caa3df359"`
[INFO] [stdout] c1318aec68831681d88b35ad7b2d4b59a99a45efccceef2107363d8caa3df359