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Diffstat (limited to '')
-rw-r--r-- | src/tools/clippy/tests/ui/map_identity.rs | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/map_identity.rs b/src/tools/clippy/tests/ui/map_identity.rs new file mode 100644 index 000000000..ccfdc9ea7 --- /dev/null +++ b/src/tools/clippy/tests/ui/map_identity.rs @@ -0,0 +1,27 @@ +// run-rustfix +#![warn(clippy::map_identity)] +#![allow(clippy::needless_return)] + +fn main() { + let x: [u16; 3] = [1, 2, 3]; + // should lint + let _: Vec<_> = x.iter().map(not_identity).map(|x| return x).collect(); + let _: Vec<_> = x.iter().map(std::convert::identity).map(|y| y).collect(); + let _: Option<u8> = Some(3).map(|x| x); + let _: Result<i8, f32> = Ok(-3).map(|x| { + return x; + }); + // should not lint + let _: Vec<_> = x.iter().map(|x| 2 * x).collect(); + let _: Vec<_> = x.iter().map(not_identity).map(|x| return x - 4).collect(); + let _: Option<u8> = None.map(|x: u8| x - 1); + let _: Result<i8, f32> = Err(2.3).map(|x: i8| { + return x + 3; + }); + let _: Result<u32, u32> = Ok(1).map_err(|a| a); + let _: Result<u32, u32> = Ok(1).map_err(|a: u32| a * 42); +} + +fn not_identity(x: &u16) -> u16 { + *x +} |