diff options
| -rw-r--r-- | tests/ui/unnecessary_result_map_or_else.fixed | 61 | ||||
| -rw-r--r-- | tests/ui/unnecessary_result_map_or_else.rs | 69 | ||||
| -rw-r--r-- | tests/ui/unnecessary_result_map_or_else.stderr | 35 |
3 files changed, 165 insertions, 0 deletions
diff --git a/tests/ui/unnecessary_result_map_or_else.fixed b/tests/ui/unnecessary_result_map_or_else.fixed new file mode 100644 index 00000000000..224e0b52d75 --- /dev/null +++ b/tests/ui/unnecessary_result_map_or_else.fixed @@ -0,0 +1,61 @@ +#![warn(clippy::unnecessary_result_map_or_else)] +#![allow(clippy::unnecessary_literal_unwrap, clippy::let_and_return, clippy::let_unit_value)] + +fn main() { + let x: Result<(), ()> = Ok(()); + x.unwrap_or_else(|err| err); //~ ERROR: unused "map closure" when calling + + // Type ascribtion. + let x: Result<(), ()> = Ok(()); + x.unwrap_or_else(|err: ()| err); //~ ERROR: unused "map closure" when calling + + // Auto-deref. + let y = String::new(); + let x: Result<&String, &String> = Ok(&y); + let y: &str = x.unwrap_or_else(|err| err); //~ ERROR: unused "map closure" when calling + + // Temporary variable. + let x: Result<(), ()> = Ok(()); + x.unwrap_or_else(|err| err); + + // Should not warn. + let x: Result<usize, usize> = Ok(0); + x.map_or_else(|err| err, |n| n + 1); + + // Should not warn. + let y = (); + let x: Result<(), ()> = Ok(()); + x.map_or_else(|err| err, |_| y); + + // Should not warn. + let y = (); + let x: Result<(), ()> = Ok(()); + x.map_or_else( + |err| err, + |_| { + let tmp = y; + tmp + }, + ); + + // Should not warn. + let x: Result<usize, usize> = Ok(1); + x.map_or_else( + |err| err, + |n| { + let tmp = n + 1; + tmp + }, + ); + + // Should not warn. + let y = 0; + let x: Result<usize, usize> = Ok(1); + x.map_or_else( + |err| err, + |n| { + let tmp = n; + y + }, + ); +} diff --git a/tests/ui/unnecessary_result_map_or_else.rs b/tests/ui/unnecessary_result_map_or_else.rs new file mode 100644 index 00000000000..4fe950a4cfa --- /dev/null +++ b/tests/ui/unnecessary_result_map_or_else.rs @@ -0,0 +1,69 @@ +#![warn(clippy::unnecessary_result_map_or_else)] +#![allow(clippy::unnecessary_literal_unwrap, clippy::let_and_return, clippy::let_unit_value)] + +fn main() { + let x: Result<(), ()> = Ok(()); + x.map_or_else(|err| err, |n| n); //~ ERROR: unused "map closure" when calling + + // Type ascribtion. + let x: Result<(), ()> = Ok(()); + x.map_or_else(|err: ()| err, |n: ()| n); //~ ERROR: unused "map closure" when calling + + // Auto-deref. + let y = String::new(); + let x: Result<&String, &String> = Ok(&y); + let y: &str = x.map_or_else(|err| err, |n| n); //~ ERROR: unused "map closure" when calling + + // Temporary variable. + let x: Result<(), ()> = Ok(()); + x.map_or_else( + //~^ ERROR: unused "map closure" when calling + |err| err, + |n| { + let tmp = n; + let tmp2 = tmp; + tmp2 + }, + ); + + // Should not warn. + let x: Result<usize, usize> = Ok(0); + x.map_or_else(|err| err, |n| n + 1); + + // Should not warn. + let y = (); + let x: Result<(), ()> = Ok(()); + x.map_or_else(|err| err, |_| y); + + // Should not warn. + let y = (); + let x: Result<(), ()> = Ok(()); + x.map_or_else( + |err| err, + |_| { + let tmp = y; + tmp + }, + ); + + // Should not warn. + let x: Result<usize, usize> = Ok(1); + x.map_or_else( + |err| err, + |n| { + let tmp = n + 1; + tmp + }, + ); + + // Should not warn. + let y = 0; + let x: Result<usize, usize> = Ok(1); + x.map_or_else( + |err| err, + |n| { + let tmp = n; + y + }, + ); +} diff --git a/tests/ui/unnecessary_result_map_or_else.stderr b/tests/ui/unnecessary_result_map_or_else.stderr new file mode 100644 index 00000000000..0f83be5d556 --- /dev/null +++ b/tests/ui/unnecessary_result_map_or_else.stderr @@ -0,0 +1,35 @@ +error: unused "map closure" when calling `Result::map_or_else` value + --> $DIR/unnecessary_result_map_or_else.rs:6:5 + | +LL | x.map_or_else(|err| err, |n| n); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `unwrap_or_else`: `x.unwrap_or_else(|err| err)` + | + = note: `-D clippy::unnecessary-result-map-or-else` implied by `-D warnings` + = help: to override `-D warnings` add `#[allow(clippy::unnecessary_result_map_or_else)]` + +error: unused "map closure" when calling `Result::map_or_else` value + --> $DIR/unnecessary_result_map_or_else.rs:10:5 + | +LL | x.map_or_else(|err: ()| err, |n: ()| n); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `unwrap_or_else`: `x.unwrap_or_else(|err: ()| err)` + +error: unused "map closure" when calling `Result::map_or_else` value + --> $DIR/unnecessary_result_map_or_else.rs:15:19 + | +LL | let y: &str = x.map_or_else(|err| err, |n| n); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `unwrap_or_else`: `x.unwrap_or_else(|err| err)` + +error: unused "map closure" when calling `Result::map_or_else` value + --> $DIR/unnecessary_result_map_or_else.rs:19:5 + | +LL | / x.map_or_else( +LL | | +LL | | |err| err, +LL | | |n| { +... | +LL | | }, +LL | | ); + | |_____^ help: consider using `unwrap_or_else`: `x.unwrap_or_else(|err| err)` + +error: aborting due to 4 previous errors + |