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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.
27 lines
1.1 KiB
Text
27 lines
1.1 KiB
Text
error: this function has an empty `#[must_use]` attribute, but returns a type already marked as `#[must_use]`
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--> $DIR/double_must_use.rs:4:1
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LL | pub fn must_use_result() -> Result<(), ()> {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: `-D clippy::double-must-use` implied by `-D warnings`
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= help: either add some descriptive text or remove the attribute
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error: this function has an empty `#[must_use]` attribute, but returns a type already marked as `#[must_use]`
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--> $DIR/double_must_use.rs:9:1
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LL | pub fn must_use_tuple() -> (Result<(), ()>, u8) {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= help: either add some descriptive text or remove the attribute
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error: this function has an empty `#[must_use]` attribute, but returns a type already marked as `#[must_use]`
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--> $DIR/double_must_use.rs:14:1
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LL | pub fn must_use_array() -> [Result<(), ()>; 1] {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= help: either add some descriptive text or remove the attribute
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error: aborting due to 3 previous errors
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