Rollup merge of #84221 - ABouttefeux:generic-arg-elision, r=estebank

[rust.git] / src / tools / clippy / tests / ui / unused_io_amount.rs

diff --git a/src/tools/clippy/tests/ui/unused_io_amount.rs b/src/tools/clippy/tests/ui/unused_io_amount.rs
index ebaba9629db16d515367030d40d31f792754b057..8b141e25942d7f74a6eb90685def758340ce46ee 100644 (file)
--- a/src/tools/clippy/tests/ui/unused_io_amount.rs
+++ b/src/tools/clippy/tests/ui/unused_io_amount.rs
@@ -1,7 +1,7 @@
 #![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")?;
@@ -22,4 +22,43 @@ fn vectored<T: io::Read + io::Write>(s: &mut T) -> io::Result<()> {
     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() {}