Enum rustc_infer::infer::snapshot::undo_log::UndoLog

pub(crate) enum UndoLog<'tcx> {
    OpaqueTypes(OpaqueTypeKey<'tcx>, Option<OpaqueHiddenType<'tcx>>),
    TypeVariables(UndoLog<Delegate<TyVidEqKey<'tcx>>>),
    ConstUnificationTable(UndoLog<Delegate<ConstVidKey<'tcx>>>),
    IntUnificationTable(UndoLog<Delegate<IntVid>>),
    FloatUnificationTable(UndoLog<Delegate<FloatVid>>),
    EffectUnificationTable(UndoLog<Delegate<EffectVidKey<'tcx>>>),
    RegionConstraintCollector(UndoLog<'tcx>),
    RegionUnificationTable(UndoLog<Delegate<RegionVidKey<'tcx>>>),
    ProjectionCache(UndoLog<ProjectionCacheKey<'tcx>, ProjectionCacheEntry<'tcx>>),
    PushRegionObligation,
}

Records the “undo” data for a single operation that affects some form of inference variable.

Variants

OpaqueTypes(OpaqueTypeKey<'tcx>, Option<OpaqueHiddenType<'tcx>>)

TypeVariables(UndoLog<Delegate<TyVidEqKey<'tcx>>>)

ConstUnificationTable(UndoLog<Delegate<ConstVidKey<'tcx>>>)

IntUnificationTable(UndoLog<Delegate<IntVid>>)

FloatUnificationTable(UndoLog<Delegate<FloatVid>>)

EffectUnificationTable(UndoLog<Delegate<EffectVidKey<'tcx>>>)

RegionConstraintCollector(UndoLog<'tcx>)

RegionUnificationTable(UndoLog<Delegate<RegionVidKey<'tcx>>>)

ProjectionCache(UndoLog<ProjectionCacheKey<'tcx>, ProjectionCacheEntry<'tcx>>)

PushRegionObligation

Trait Implementations

impl<'tcx> Clone for UndoLog<'tcx>

fn clone(&self) -> UndoLog<'tcx>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'tcx> From<UndoLog<'tcx>> for UndoLog<'tcx>

fn from(x: UndoLog<'tcx>) -> Self

Converts to this type from the input type.

impl<'tcx> From<UndoLog<ProjectionCacheKey<'tcx>, ProjectionCacheEntry<'tcx>>> for UndoLog<'tcx>

fn from( x: UndoLog<ProjectionCacheKey<'tcx>, ProjectionCacheEntry<'tcx>> ) -> Self

Converts to this type from the input type.

impl<'tcx> Rollback<UndoLog<'tcx>> for InferCtxtInner<'tcx>

The Rollback trait defines how to rollback a particular action.

fn reverse(&mut self, undo: UndoLog<'tcx>)

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: 56 bytes

Size for each variant:

• OpaqueTypes: 40 bytes
• TypeVariables: 40 bytes
• ConstUnificationTable: 48 bytes
• IntUnificationTable: 32 bytes
• FloatUnificationTable: 32 bytes
• EffectUnificationTable: 32 bytes
• RegionConstraintCollector: 32 bytes
• RegionUnificationTable: 40 bytes
• ProjectionCache: 56 bytes
• PushRegionObligation: 0 bytes