[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/beta-1.38-1/sources/1.37.0/gh/gannonchan/var_study"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/gannonchan/var_study'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/gannonchan/var_study" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/gannonchan/var_study"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/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 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of gannonchan/var_study on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "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/beta-1.38-1/sources/1.37.0/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/beta-1.38-1/sources/beta-2019-08-13/gh/gannonchan/var_study/Cargo.toml
[INFO] crate gannonchan/var_study already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing gannonchan/var_study against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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=warn" "-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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 603ce7df184e7732e4d38d4c3091e4311c851cf0b9054da038fa57afc9753bb3
[INFO] running `"docker" "start" "-a" "603ce7df184e7732e4d38d4c3091e4311c851cf0b9054da038fa57afc9753bb3"`
[INFO] [stderr]    Compiling 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 prefixing with an underscore: `_first_name`
[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 prefixing with an underscore: `_last_name`
[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 prefixing with an underscore: `_f`
[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 prefixing with an underscore: `_f`
[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 prefixing with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.25s
[INFO] running `"docker" "inspect" "603ce7df184e7732e4d38d4c3091e4311c851cf0b9054da038fa57afc9753bb3"`
[INFO] running `"docker" "rm" "-f" "603ce7df184e7732e4d38d4c3091e4311c851cf0b9054da038fa57afc9753bb3"`
[INFO] [stdout] 603ce7df184e7732e4d38d4c3091e4311c851cf0b9054da038fa57afc9753bb3
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 23a577c0c47b454a74acc0fc342bd64a092c62745021c32eaa8b744e855a5713
[INFO] running `"docker" "start" "-a" "23a577c0c47b454a74acc0fc342bd64a092c62745021c32eaa8b744e855a5713"`
[INFO] [stderr]    Compiling 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 prefixing with an underscore: `_first_name`
[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 prefixing with an underscore: `_last_name`
[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 prefixing with an underscore: `_f`
[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 prefixing with an underscore: `_f`
[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 prefixing with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.76s
[INFO] running `"docker" "inspect" "23a577c0c47b454a74acc0fc342bd64a092c62745021c32eaa8b744e855a5713"`
[INFO] running `"docker" "rm" "-f" "23a577c0c47b454a74acc0fc342bd64a092c62745021c32eaa8b744e855a5713"`
[INFO] [stdout] 23a577c0c47b454a74acc0fc342bd64a092c62745021c32eaa8b744e855a5713
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 45b5f64d53bb5a39ecf334da7c2770607b28e2a9c0b7c8c2d03ab5b04c777219
[INFO] running `"docker" "start" "-a" "45b5f64d53bb5a39ecf334da7c2770607b28e2a9c0b7c8c2d03ab5b04c777219"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/var_study-1beddff176793531
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "45b5f64d53bb5a39ecf334da7c2770607b28e2a9c0b7c8c2d03ab5b04c777219"`
[INFO] running `"docker" "rm" "-f" "45b5f64d53bb5a39ecf334da7c2770607b28e2a9c0b7c8c2d03ab5b04c777219"`
[INFO] [stdout] 45b5f64d53bb5a39ecf334da7c2770607b28e2a9c0b7c8c2d03ab5b04c777219