pub(crate) struct MirTypeckRegionConstraints<'tcx> {
    pub(crate) placeholder_indices: PlaceholderIndices,
    pub(crate) placeholder_index_to_region: IndexVec<PlaceholderIndex, Region<'tcx>>,
    pub(crate) liveness_constraints: LivenessValues<RegionVid>,
    pub(crate) outlives_constraints: OutlivesConstraintSet<'tcx>,
    pub(crate) member_constraints: MemberConstraintSet<'tcx, RegionVid>,
    pub(crate) universe_causes: FxIndexMap<UniverseIndex, UniverseInfo<'tcx>>,
    pub(crate) type_tests: Vec<TypeTest<'tcx>>,
}
Expand description

A collection of region constraints that must be satisfied for the program to be considered well-typed.

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§placeholder_indices: PlaceholderIndices

Maps from a ty::Placeholder to the corresponding PlaceholderIndex bit that we will use for it.

To keep everything in sync, do not insert this set directly. Instead, use the placeholder_region helper.

§placeholder_index_to_region: IndexVec<PlaceholderIndex, Region<'tcx>>

Each time we add a placeholder to placeholder_indices, we also create a corresponding “representative” region vid for that wraps it. This vector tracks those. This way, when we convert the same ty::RePlaceholder(p) twice, we can map to the same underlying RegionVid.

§liveness_constraints: LivenessValues<RegionVid>

In general, the type-checker is not responsible for enforcing liveness constraints; this job falls to the region inferencer, which performs a liveness analysis. However, in some limited cases, the MIR type-checker creates temporary regions that do not otherwise appear in the MIR – in particular, the late-bound regions that it instantiates at call-sites – and hence it must report on their liveness constraints.

§outlives_constraints: OutlivesConstraintSet<'tcx>§member_constraints: MemberConstraintSet<'tcx, RegionVid>§universe_causes: FxIndexMap<UniverseIndex, UniverseInfo<'tcx>>§type_tests: Vec<TypeTest<'tcx>>

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impl<'tcx> MirTypeckRegionConstraints<'tcx>

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fn placeholder_region( &mut self, infcx: &InferCtxt<'tcx>, placeholder: PlaceholderRegion ) -> Region<'tcx>

Creates a Region for a given PlaceholderRegion, or returns the region that corresponds to a previously created one.

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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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 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: 328 bytes