rust-clippy/tests/ui/manual_map_option.stderr

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Text

error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:15:5
|
LL | / match Some(0) {
LL | | Some(_) => Some(2),
LL | | None::<u32> => None,
LL | | };
| |_____^ help: try this: `Some(0).map(|_| 2)`
|
= note: `-D clippy::manual-map` implied by `-D warnings`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:20:5
|
LL | / match Some(0) {
LL | | Some(x) => Some(x + 1),
LL | | _ => None,
LL | | };
| |_____^ help: try this: `Some(0).map(|x| x + 1)`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:25:5
|
LL | / match Some("") {
LL | | Some(x) => Some(x.is_empty()),
LL | | None => None,
LL | | };
| |_____^ help: try this: `Some("").map(|x| x.is_empty())`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:30:5
|
LL | / if let Some(x) = Some(0) {
LL | | Some(!x)
LL | | } else {
LL | | None
LL | | };
| |_____^ help: try this: `Some(0).map(|x| !x)`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:37:5
|
LL | / match Some(0) {
LL | | Some(x) => { Some(std::convert::identity(x)) }
LL | | None => { None }
LL | | };
| |_____^ help: try this: `Some(0).map(std::convert::identity)`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:42:5
|
LL | / match Some(&String::new()) {
LL | | Some(x) => Some(str::len(x)),
LL | | None => None,
LL | | };
| |_____^ help: try this: `Some(&String::new()).map(|x| str::len(x))`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:52:5
|
LL | / match &Some([0, 1]) {
LL | | Some(x) => Some(x[0]),
LL | | &None => None,
LL | | };
| |_____^ help: try this: `Some([0, 1]).as_ref().map(|x| x[0])`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:57:5
|
LL | / match &Some(0) {
LL | | &Some(x) => Some(x * 2),
LL | | None => None,
LL | | };
| |_____^ help: try this: `Some(0).map(|x| x * 2)`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:62:5
|
LL | / match Some(String::new()) {
LL | | Some(ref x) => Some(x.is_empty()),
LL | | _ => None,
LL | | };
| |_____^ help: try this: `Some(String::new()).as_ref().map(|x| x.is_empty())`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:67:5
|
LL | / match &&Some(String::new()) {
LL | | Some(x) => Some(x.len()),
LL | | _ => None,
LL | | };
| |_____^ help: try this: `Some(String::new()).as_ref().map(|x| x.len())`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:72:5
|
LL | / match &&Some(0) {
LL | | &&Some(x) => Some(x + x),
LL | | &&_ => None,
LL | | };
| |_____^ help: try this: `Some(0).map(|x| x + x)`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:85:9
|
LL | / match &mut Some(String::new()) {
LL | | Some(x) => Some(x.push_str("")),
LL | | None => None,
LL | | };
| |_________^ help: try this: `Some(String::new()).as_mut().map(|x| x.push_str(""))`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:91:5
|
LL | / match &mut Some(String::new()) {
LL | | Some(ref x) => Some(x.len()),
LL | | None => None,
LL | | };
| |_____^ help: try this: `Some(String::new()).as_ref().map(|x| x.len())`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:96:5
|
LL | / match &mut &Some(String::new()) {
LL | | Some(x) => Some(x.is_empty()),
LL | | &mut _ => None,
LL | | };
| |_____^ help: try this: `Some(String::new()).as_ref().map(|x| x.is_empty())`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:101:5
|
LL | / match Some((0, 1, 2)) {
LL | | Some((x, y, z)) => Some(x + y + z),
LL | | None => None,
LL | | };
| |_____^ help: try this: `Some((0, 1, 2)).map(|(x, y, z)| x + y + z)`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:106:5
|
LL | / match Some([1, 2, 3]) {
LL | | Some([first, ..]) => Some(first),
LL | | None => None,
LL | | };
| |_____^ help: try this: `Some([1, 2, 3]).map(|[first, ..]| first)`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:111:5
|
LL | / match &Some((String::new(), "test")) {
LL | | Some((x, y)) => Some((y, x)),
LL | | None => None,
LL | | };
| |_____^ help: try this: `Some((String::new(), "test")).as_ref().map(|(x, y)| (y, x))`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:169:5
|
LL | / match Some(0) {
LL | | Some(x) => Some(vec![x]),
LL | | None => None,
LL | | };
| |_____^ help: try this: `Some(0).map(|x| vec![x])`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:174:5
|
LL | / match option_env!("") {
LL | | Some(x) => Some(String::from(x)),
LL | | None => None,
LL | | };
| |_____^ help: try this: `option_env!("").map(String::from)`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:194:12
|
LL | } else if let Some(x) = Some(0) {
| ____________^
LL | | Some(x + 1)
LL | | } else {
LL | | None
LL | | };
| |_____^ help: try this: `{ Some(0).map(|x| x + 1) }`
error: manual implementation of `Option::map`
--> $DIR/manual_map_option.rs:202:12
|
LL | } else if let Some(x) = Some(0) {
| ____________^
LL | | Some(x + 1)
LL | | } else {
LL | | None
LL | | };
| |_____^ help: try this: `{ Some(0).map(|x| x + 1) }`
error: aborting due to 21 previous errors