pub(crate) struct UsefulnessReport<'p, 'tcx> {
    pub(crate) arm_usefulness: Vec<(MatchArm<'p, 'tcx>, Reachability)>,
    pub(crate) non_exhaustiveness_witnesses: Vec<DeconstructedPat<'p, 'tcx>>,
}
Expand description

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

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§arm_usefulness: Vec<(MatchArm<'p, 'tcx>, Reachability)>

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

§non_exhaustiveness_witnesses: Vec<DeconstructedPat<'p, 'tcx>>

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

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

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

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

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impl<'p, 'tcx> Unpin for UsefulnessReport<'p, 'tcx>

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

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

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fn type_id(&self) -> TypeId

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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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

Mutably borrows from an owned value. Read more
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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 Twhere 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 Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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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 Twhere 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>

Performs the conversion.

Layout§

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