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.
Fields§
§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>>
Implementations§
source§impl<'tcx> MirTypeckRegionConstraints<'tcx>
impl<'tcx> MirTypeckRegionConstraints<'tcx>
sourcefn placeholder_region(
&mut self,
infcx: &InferCtxt<'tcx>,
placeholder: PlaceholderRegion
) -> Region<'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.
Auto Trait Implementations§
impl<'tcx> !RefUnwindSafe for MirTypeckRegionConstraints<'tcx>
impl<'tcx> !Send for MirTypeckRegionConstraints<'tcx>
impl<'tcx> !Sync for MirTypeckRegionConstraints<'tcx>
impl<'tcx> Unpin for MirTypeckRegionConstraints<'tcx>
impl<'tcx> !UnwindSafe for MirTypeckRegionConstraints<'tcx>
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
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