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.


§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>>



impl<'tcx> MirTypeckRegionConstraints<'tcx>


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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Size: 328 bytes