#![allow(dead_code)]
#![warn(clippy::unused_io_amount)]
-use std::io;
+use std::io::{self, Read};
fn question_mark<T: io::Read + io::Write>(s: &mut T) -> io::Result<()> {
s.write(b"test")?;
Ok(())
}
+fn ok(file: &str) -> Option<()> {
+ let mut reader = std::fs::File::open(file).ok()?;
+ let mut result = [0u8; 0];
+ reader.read(&mut result).ok()?;
+ Some(())
+}
+
+#[allow(clippy::redundant_closure)]
+#[allow(clippy::bind_instead_of_map)]
+fn or_else(file: &str) -> io::Result<()> {
+ let mut reader = std::fs::File::open(file)?;
+ let mut result = [0u8; 0];
+ reader.read(&mut result).or_else(|err| Err(err))?;
+ Ok(())
+}
+
+#[derive(Debug)]
+enum Error {
+ Kind,
+}
+
+fn or(file: &str) -> Result<(), Error> {
+ let mut reader = std::fs::File::open(file).unwrap();
+ let mut result = [0u8; 0];
+ reader.read(&mut result).or(Err(Error::Kind))?;
+ Ok(())
+}
+
+fn combine_or(file: &str) -> Result<(), Error> {
+ let mut reader = std::fs::File::open(file).unwrap();
+ let mut result = [0u8; 0];
+ reader
+ .read(&mut result)
+ .or(Err(Error::Kind))
+ .or(Err(Error::Kind))
+ .expect("error");
+ Ok(())
+}
+
fn main() {}