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https://github.com/rust-lang/rust-clippy
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`must_use_unit` lints unit-returning functions with a `#[must_use]` attribute, suggesting to remove it. `double_must_use` lints functions with a plain `#[must_use]` attribute, but which return a type which is already `#[must_use]`, so the attribute has no benefit. `must_use_candidate` is a pedantic lint that lints functions and methods that return some non-unit type that is not already `#[must_use]` and suggests to add the annotation.
40 lines
1.7 KiB
Text
40 lines
1.7 KiB
Text
error: this function could have a `#[must_use]` attribute
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--> $DIR/must_use_candidates.rs:12:1
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LL | pub fn pure(i: u8) -> u8 {
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| ^^^^^^^^^^^^^^^^^^^^^^^^ help: add the attribute: `#[must_use] pub fn pure(i: u8) -> u8`
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= note: `-D clippy::must-use-candidate` implied by `-D warnings`
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error: this method could have a `#[must_use]` attribute
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--> $DIR/must_use_candidates.rs:17:5
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LL | pub fn inherent_pure(&self) -> u8 {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: add the attribute: `#[must_use] pub fn inherent_pure(&self) -> u8`
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error: this method could have a `#[must_use]` attribute
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--> $DIR/must_use_candidates.rs:31:5
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LL | fn trait_impl_pure(&self, i: u32) -> u32 {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: add the attribute: `#[must_use] fn trait_impl_pure(&self, i: u32) -> u32`
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error: this function could have a `#[must_use]` attribute
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--> $DIR/must_use_candidates.rs:48:1
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LL | pub fn with_marker(_d: std::marker::PhantomData<&mut u32>) -> bool {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: add the attribute: `#[must_use] pub fn with_marker(_d: std::marker::PhantomData<&mut u32>) -> bool`
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error: this function could have a `#[must_use]` attribute
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--> $DIR/must_use_candidates.rs:60:1
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LL | pub fn rcd(_x: Rc<u32>) -> bool {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: add the attribute: `#[must_use] pub fn rcd(_x: Rc<u32>) -> bool`
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error: this function could have a `#[must_use]` attribute
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--> $DIR/must_use_candidates.rs:68:1
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LL | pub fn arcd(_x: Arc<u32>) -> bool {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: add the attribute: `#[must_use] pub fn arcd(_x: Arc<u32>) -> bool`
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error: aborting due to 6 previous errors
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