Oct 12 21:18:54.989 INFO checking gannonchan/var_study against try#4021bd0b3c5815b087d6db10ce461e7e4854ade7 for pr-54977
Oct 12 21:18:54.989 INFO running `"docker" "create" "-v" "/mnt/big/crater/./work/local/target-dirs/pr-54977/worker-4/try#4021bd0b3c5815b087d6db10ce461e7e4854ade7:/target:rw,Z" "-v" "/mnt/big/crater/./work/local/test-source/worker-4/pr-54977/try#4021bd0b3c5815b087d6db10ce461e7e4854ade7:/source:ro,Z" "-v" "/mnt/big/crater/./work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/./work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +4021bd0b3c5815b087d6db10ce461e7e4854ade7-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Oct 12 21:18:55.425 INFO blam! 75145dd6b7e30f577476eaf2bbe0036634f02a5f1f8aeda6ca859b30375ec9cb
Oct 12 21:18:55.433 INFO running `"docker" "start" "-a" "75145dd6b7e30f577476eaf2bbe0036634f02a5f1f8aeda6ca859b30375ec9cb"`
Oct 12 21:18:56.449 INFO kablam! usermod: no changes
Oct 12 21:18:56.504 INFO kablam!     Checking var_study v0.1.0 (/source)
Oct 12 21:18:57.048 INFO kablam! warning: unused variable: `first_name`
Oct 12 21:18:57.048 INFO kablam!   --> src/main.rs:23:9
Oct 12 21:18:57.048 INFO kablam!    |
Oct 12 21:18:57.048 INFO kablam! 23 |     let first_name = String::from("0");
Oct 12 21:18:57.048 INFO kablam!    |         ^^^^^^^^^^ help: consider using `_first_name` instead
Oct 12 21:18:57.048 INFO kablam!    |
Oct 12 21:18:57.048 INFO kablam!    = note: #[warn(unused_variables)] on by default
Oct 12 21:18:57.048 INFO kablam! 
Oct 12 21:18:57.048 INFO kablam! warning: unused variable: `last_name`
Oct 12 21:18:57.048 INFO kablam!   --> src/main.rs:24:9
Oct 12 21:18:57.048 INFO kablam!    |
Oct 12 21:18:57.048 INFO kablam! 24 |     let last_name = String::from("张三");
Oct 12 21:18:57.048 INFO kablam!    |         ^^^^^^^^^ help: consider using `_last_name` instead
Oct 12 21:18:57.048 INFO kablam! 
Oct 12 21:18:57.049 INFO kablam! warning: unused variable: `f`
Oct 12 21:18:57.049 INFO kablam!   --> src/main.rs:73:9
Oct 12 21:18:57.049 INFO kablam!    |
Oct 12 21:18:57.049 INFO kablam! 73 |     let f = match f {   //使用match判断打开文件是否出现错误
Oct 12 21:18:57.049 INFO kablam!    |         ^ help: consider using `_f` instead
Oct 12 21:18:57.049 INFO kablam! 
Oct 12 21:18:57.049 INFO kablam! warning: unused variable: `f`
Oct 12 21:18:57.049 INFO kablam!   --> src/main.rs:95:9
Oct 12 21:18:57.049 INFO kablam!    |
Oct 12 21:18:57.049 INFO kablam! 95 |     let f = File::open("d:\\hello.txt").unwrap();
Oct 12 21:18:57.049 INFO kablam!    |         ^ help: consider using `_f` instead
Oct 12 21:18:57.049 INFO kablam! 
Oct 12 21:18:57.049 INFO kablam! warning: unused variable: `f`
Oct 12 21:18:57.049 INFO kablam!   --> src/main.rs:97:9
Oct 12 21:18:57.049 INFO kablam!    |
Oct 12 21:18:57.049 INFO kablam! 97 |     let f = File::open("d:\\hello.txt").expect("打开文件发生错误！");
Oct 12 21:18:57.049 INFO kablam!    |         ^ help: consider using `_f` instead
Oct 12 21:18:57.049 INFO kablam! 
Oct 12 21:18:57.168 INFO kablam! warning: unused variable: `first_name`
Oct 12 21:18:57.168 INFO kablam!   --> src/main.rs:23:9
Oct 12 21:18:57.168 INFO kablam!    |
Oct 12 21:18:57.168 INFO kablam! 23 |     let first_name = String::from("0");
Oct 12 21:18:57.168 INFO kablam!    |         ^^^^^^^^^^ help: consider using `_first_name` instead
Oct 12 21:18:57.168 INFO kablam!    |
Oct 12 21:18:57.168 INFO kablam!    = note: #[warn(unused_variables)] on by default
Oct 12 21:18:57.168 INFO kablam! 
Oct 12 21:18:57.168 INFO kablam! warning: unused variable: `last_name`
Oct 12 21:18:57.168 INFO kablam!   --> src/main.rs:24:9
Oct 12 21:18:57.168 INFO kablam!    |
Oct 12 21:18:57.168 INFO kablam! 24 |     let last_name = String::from("张三");
Oct 12 21:18:57.168 INFO kablam!    |         ^^^^^^^^^ help: consider using `_last_name` instead
Oct 12 21:18:57.168 INFO kablam! 
Oct 12 21:18:57.168 INFO kablam! warning: unused variable: `f`
Oct 12 21:18:57.168 INFO kablam!   --> src/main.rs:73:9
Oct 12 21:18:57.168 INFO kablam!    |
Oct 12 21:18:57.168 INFO kablam! 73 |     let f = match f {   //使用match判断打开文件是否出现错误
Oct 12 21:18:57.168 INFO kablam!    |         ^ help: consider using `_f` instead
Oct 12 21:18:57.168 INFO kablam! 
Oct 12 21:18:57.168 INFO kablam! warning: unused variable: `f`
Oct 12 21:18:57.168 INFO kablam!   --> src/main.rs:95:9
Oct 12 21:18:57.168 INFO kablam!    |
Oct 12 21:18:57.168 INFO kablam! 95 |     let f = File::open("d:\\hello.txt").unwrap();
Oct 12 21:18:57.168 INFO kablam!    |         ^ help: consider using `_f` instead
Oct 12 21:18:57.176 INFO kablam! 
Oct 12 21:18:57.176 INFO kablam! warning: unused variable: `f`
Oct 12 21:18:57.176 INFO kablam!   --> src/main.rs:97:9
Oct 12 21:18:57.176 INFO kablam!    |
Oct 12 21:18:57.176 INFO kablam! 97 |     let f = File::open("d:\\hello.txt").expect("打开文件发生错误！");
Oct 12 21:18:57.176 INFO kablam!    |         ^ help: consider using `_f` instead
Oct 12 21:18:57.176 INFO kablam! 
Oct 12 21:18:57.244 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 0.76s
Oct 12 21:18:57.248 INFO kablam! su: No module specific data is present
Oct 12 21:18:58.522 INFO running `"docker" "rm" "-f" "75145dd6b7e30f577476eaf2bbe0036634f02a5f1f8aeda6ca859b30375ec9cb"`
Oct 12 21:18:58.754 INFO blam! 75145dd6b7e30f577476eaf2bbe0036634f02a5f1f8aeda6ca859b30375ec9cb