Struct rustc_pattern_analysis::usefulness::UsefulnessReport

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pub struct UsefulnessReport<'p, Cx: TypeCx> {
    pub arm_usefulness: Vec<(MatchArm<'p, Cx>, Usefulness<'p, Cx>)>,
    pub non_exhaustiveness_witnesses: Vec<WitnessPat<Cx>>,
}
Expand description

The output of checking a match for exhaustiveness and arm usefulness.

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§arm_usefulness: Vec<(MatchArm<'p, Cx>, Usefulness<'p, Cx>)>

For each arm of the input, whether that arm is useful after the arms above it.

§non_exhaustiveness_witnesses: Vec<WitnessPat<Cx>>

If the match is exhaustive, this is empty. If not, this contains witnesses for the lack of exhaustiveness.

Auto Trait Implementations§

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impl<'p, Cx> !RefUnwindSafe for UsefulnessReport<'p, Cx>

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impl<'p, Cx> !Send for UsefulnessReport<'p, Cx>

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impl<'p, Cx> !Sync for UsefulnessReport<'p, Cx>

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impl<'p, Cx> Unpin for UsefulnessReport<'p, Cx>
where <Cx as TypeCx>::ArmData: Unpin, <Cx as TypeCx>::StrLit: Unpin, <Cx as TypeCx>::Ty: Unpin, <Cx as TypeCx>::VariantIdx: Unpin,

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impl<'p, Cx> !UnwindSafe for UsefulnessReport<'p, Cx>

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

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impl<'a, T> Captures<'a> for T
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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 48 bytes