コンパイルエラー

error[E0599]: cannot write into `BufWriter<Stdout>`
 --> src/main.rs:3:14
  |
3 |     writeln!(bw, "{}", i64::MIN)?;
  |              ^^
 --> /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/io/mod.rs:1814:8
  |
  = note: the method is available for `BufWriter<Stdout>` here
  |
note: must implement `io::Write`, `fmt::Write`, or have a `write_fmt` method
 --> src/main.rs:3:14
  |
3 |     writeln!(bw, "{}", i64::MIN)?;
  |              ^^
  = help: items from traits can only be used if the trait is in scope
help: trait `Write` which provides `write_fmt` is implemented but not in scope; perhaps you want to import it
  |
1 + use std::io::Write;
  |

error[E0599]: no method named `flush` found for struct `BufWriter` in the current scope
 --> src/main.rs:4:8
  |
4 |     bw.flush()?;
  |        ^^^^^ method not found in `BufWriter<Stdout>`
 --> /rustc/3f5fd8dd41153bc5fdca9427e9e05be2c767ba23/library/std/src/io/mod.rs:1665:8
  |
  = note: the method is available for `BufWriter<Stdout>` here
  |
  = help: items from traits can only be used if the trait is in scope
help: trait `Write` which provides `flush` is implemented but not in scope; perhaps you want to import it
  |
1 + use std::io::Write;
  |

For more information about this error, try `rustc --explain E0599`.
error: could not compile `Rust` (bin "Rust") due to 2 previous errors