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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.
28 lines
843 B
Text
28 lines
843 B
Text
error: this unit-returning function has a `#[must_use]` attribute
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--> $DIR/must_use_unit.rs:11:1
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LL | #[must_use]
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| ----------- help: remove the attribute
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LL | pub fn must_use_default() {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: `-D clippy::must-use-unit` implied by `-D warnings`
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error: this unit-returning function has a `#[must_use]` attribute
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--> $DIR/must_use_unit.rs:14:1
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LL | #[must_use]
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| ----------- help: remove the attribute
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LL | pub fn must_use_unit() -> () {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: this unit-returning function has a `#[must_use]` attribute
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--> $DIR/must_use_unit.rs:17:1
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LL | #[must_use = "With note"]
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| ------------------------- help: remove the attribute
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LL | pub fn must_use_with_note() {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: aborting due to 3 previous errors
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