rustc_pattern_analysis::usefulness

Struct UsefulnessReport

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pub struct UsefulnessReport<'p, Cx: PatCx> {
    pub arm_usefulness: Vec<(MatchArm<'p, Cx>, Usefulness<'p, Cx>)>,
    pub non_exhaustiveness_witnesses: Vec<WitnessPat<Cx>>,
    pub arm_intersections: Vec<BitSet<usize>>,
}
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.

§arm_intersections: Vec<BitSet<usize>>

For each arm, a set of indices of arms above it that have non-empty intersection, i.e. there is a value matched by both arms. This may miss real intersections.

Auto Trait Implementations§

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impl<'p, Cx> DynSend for UsefulnessReport<'p, Cx>
where <Cx as PatCx>::Ty: DynSend + DynSync, <Cx as PatCx>::ArmData: DynSend, <Cx as PatCx>::VariantIdx: DynSend + DynSync, <Cx as PatCx>::StrLit: DynSend + DynSync, <Cx as PatCx>::PatData: DynSync,

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impl<'p, Cx> DynSync for UsefulnessReport<'p, Cx>
where <Cx as PatCx>::Ty: DynSync, <Cx as PatCx>::ArmData: DynSync, <Cx as PatCx>::VariantIdx: DynSync, <Cx as PatCx>::StrLit: DynSync, <Cx as PatCx>::PatData: DynSync,

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impl<'p, Cx> Freeze for UsefulnessReport<'p, Cx>

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impl<'p, Cx> RefUnwindSafe for UsefulnessReport<'p, Cx>
where <Cx as PatCx>::Ty: RefUnwindSafe, <Cx as PatCx>::ArmData: RefUnwindSafe, <Cx as PatCx>::VariantIdx: RefUnwindSafe, <Cx as PatCx>::StrLit: RefUnwindSafe, <Cx as PatCx>::PatData: RefUnwindSafe,

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impl<'p, Cx> Send for UsefulnessReport<'p, Cx>
where <Cx as PatCx>::Ty: Send + Sync, <Cx as PatCx>::ArmData: Send, <Cx as PatCx>::VariantIdx: Send + Sync, <Cx as PatCx>::StrLit: Send + Sync, <Cx as PatCx>::PatData: Sync,

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impl<'p, Cx> Sync for UsefulnessReport<'p, Cx>
where <Cx as PatCx>::Ty: Sync, <Cx as PatCx>::ArmData: Sync, <Cx as PatCx>::VariantIdx: Sync, <Cx as PatCx>::StrLit: Sync, <Cx as PatCx>::PatData: Sync,

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

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impl<'p, Cx> UnwindSafe for UsefulnessReport<'p, Cx>
where <Cx as PatCx>::Ty: UnwindSafe + RefUnwindSafe, <Cx as PatCx>::ArmData: UnwindSafe, <Cx as PatCx>::VariantIdx: UnwindSafe + RefUnwindSafe, <Cx as PatCx>::StrLit: UnwindSafe + RefUnwindSafe, <Cx as PatCx>::PatData: RefUnwindSafe,

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Size: 72 bytes