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Lint unused_io_amount with is_ok and is_err

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This commit is contained in:
Evan Typanski 2023-01-24 18:18:35 -05:00
parent 41b2a3d9fe
commit f9f75e0932
3 changed files with 47 additions and 7 deletions
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2
clippy_lints/src/unused_io_amount.rs
View File

@ -65,7 +65,7 @@ fn check_stmt(&mut self, cx: &LateContext<'_>, s: &hir::Stmt<'_>) {
}
},
hir::ExprKind::MethodCall(path, arg_0, ..) => match path.ident.as_str() {
"expect" | "unwrap" | "unwrap_or" | "unwrap_or_else" => {
"expect" | "unwrap" | "unwrap_or" | "unwrap_or_else" | "is_ok" | "is_err" => {
check_map_error(cx, arg_0, expr);
},
_ => (),

8
tests/ui/unused_io_amount.rs
View File

@ -63,6 +63,14 @@ fn combine_or(file: &str) -> Result<(), Error> {
Ok(())
}
fn is_ok_err<T: io::Read + io::Write>(s: &mut T) {
s.write(b"ok").is_ok();
s.write(b"err").is_err();
let mut buf = [0u8; 0];
s.read(&mut buf).is_ok();
s.read(&mut buf).is_err();
}
async fn bad_async_write<W: AsyncWrite + Unpin>(w: &mut W) {
w.write(b"hello world").await.unwrap();
}

44
tests/ui/unused_io_amount.stderr
View File

@ -82,13 +82,45 @@ LL | | .expect("error");
error: written amount is not handled
--> $DIR/unused_io_amount.rs:67:5
|
LL | s.write(b"ok").is_ok();
| ^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `Write::write_all` instead, or handle partial writes
error: written amount is not handled
--> $DIR/unused_io_amount.rs:68:5
|
LL | s.write(b"err").is_err();
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `Write::write_all` instead, or handle partial writes
error: read amount is not handled
--> $DIR/unused_io_amount.rs:70:5
|
LL | s.read(&mut buf).is_ok();
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `Read::read_exact` instead, or handle partial reads
error: read amount is not handled
--> $DIR/unused_io_amount.rs:71:5
|
LL | s.read(&mut buf).is_err();
| ^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `Read::read_exact` instead, or handle partial reads
error: written amount is not handled
--> $DIR/unused_io_amount.rs:75:5
|
LL | w.write(b"hello world").await.unwrap();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `AsyncWriteExt::write_all` instead, or handle partial writes
error: read amount is not handled
--> $DIR/unused_io_amount.rs:72:5
--> $DIR/unused_io_amount.rs:80:5
|
LL | r.read(&mut buf[..]).await.unwrap();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -96,7 +128,7 @@ LL | r.read(&mut buf[..]).await.unwrap();
= help: use `AsyncReadExt::read_exact` instead, or handle partial reads
error: written amount is not handled
--> $DIR/unused_io_amount.rs:85:9
--> $DIR/unused_io_amount.rs:93:9
|
LL | w.write(b"hello world").await?;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -104,7 +136,7 @@ LL | w.write(b"hello world").await?;
= help: use `AsyncWriteExt::write_all` instead, or handle partial writes
error: read amount is not handled
--> $DIR/unused_io_amount.rs:93:9
--> $DIR/unused_io_amount.rs:101:9
|
LL | r.read(&mut buf[..]).await.or(Err(Error::Kind))?;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -112,7 +144,7 @@ LL | r.read(&mut buf[..]).await.or(Err(Error::Kind))?;
= help: use `AsyncReadExt::read_exact` instead, or handle partial reads
error: written amount is not handled
--> $DIR/unused_io_amount.rs:101:5
--> $DIR/unused_io_amount.rs:109:5
|
LL | w.write(b"hello world").await.unwrap();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -120,12 +152,12 @@ LL | w.write(b"hello world").await.unwrap();
= help: use `AsyncWriteExt::write_all` instead, or handle partial writes
error: read amount is not handled
--> $DIR/unused_io_amount.rs:106:5
--> $DIR/unused_io_amount.rs:114:5
|
LL | r.read(&mut buf[..]).await.unwrap();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `AsyncReadExt::read_exact` instead, or handle partial reads
error: aborting due to 16 previous errors
error: aborting due to 20 previous errors