pub struct InferCtxtInner<'tcx> {
    undo_log: InferCtxtUndoLogs<'tcx>,
    projection_cache: ProjectionCacheStorage<'tcx>,
    type_variable_storage: TypeVariableStorage<'tcx>,
    const_unification_storage: UnificationTableStorage<ConstVidKey<'tcx>>,
    int_unification_storage: UnificationTableStorage<IntVid>,
    float_unification_storage: UnificationTableStorage<FloatVid>,
    effect_unification_storage: UnificationTableStorage<EffectVidKey<'tcx>>,
    region_constraint_storage: Option<RegionConstraintStorage<'tcx>>,
    region_obligations: Vec<RegionObligation<'tcx>>,
    opaque_type_storage: OpaqueTypeStorage<'tcx>,
}
Expand description

This type contains all the things within InferCtxt that sit within a RefCell and are involved with taking/rolling back snapshots. Snapshot operations are hot enough that we want only one call to borrow_mut per call to start_snapshot and rollback_to.

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§undo_log: InferCtxtUndoLogs<'tcx>§projection_cache: ProjectionCacheStorage<'tcx>

Cache for projections.

This cache is snapshotted along with the infcx.

§type_variable_storage: TypeVariableStorage<'tcx>

We instantiate UnificationTable with bounds<Ty> because the types that might instantiate a general type variable have an order, represented by its upper and lower bounds.

§const_unification_storage: UnificationTableStorage<ConstVidKey<'tcx>>

Map from const parameter variable to the kind of const it represents.

§int_unification_storage: UnificationTableStorage<IntVid>

Map from integral variable to the kind of integer it represents.

§float_unification_storage: UnificationTableStorage<FloatVid>

Map from floating variable to the kind of float it represents.

§effect_unification_storage: UnificationTableStorage<EffectVidKey<'tcx>>

Map from effect variable to the effect param it represents.

§region_constraint_storage: Option<RegionConstraintStorage<'tcx>>

Tracks the set of region variables and the constraints between them.

This is initially Some(_) but when resolve_regions_and_report_errors is invoked, this gets set to None – further attempts to perform unification, etc., may fail if new region constraints would’ve been added.

§region_obligations: Vec<RegionObligation<'tcx>>

A set of constraints that regionck must validate.

Each constraint has the form T:'a, meaning “some type T must outlive the lifetime ’a”. These constraints derive from instantiated type parameters. So if you had a struct defined like the following:

struct Foo<T: 'static> { ... }

In some expression let x = Foo { ... }, it will instantiate the type parameter T with a fresh type $0. At the same time, it will record a region obligation of $0: 'static. This will get checked later by regionck. (We can’t generally check these things right away because we have to wait until types are resolved.)

These are stored in a map keyed to the id of the innermost enclosing fn body / static initializer expression. This is because the location where the obligation was incurred can be relevant with respect to which sublifetime assumptions are in place. The reason that we store under the fn-id, and not something more fine-grained, is so that it is easier for regionck to be sure that it has found all the region obligations (otherwise, it’s easy to fail to walk to a particular node-id).

Before running resolve_regions_and_report_errors, the creator of the inference context is expected to invoke InferCtxt::process_registered_region_obligations for each body-id in this map, which will process the obligations within. This is expected to be done ‘late enough’ that all type inference variables have been bound and so forth.

§opaque_type_storage: OpaqueTypeStorage<'tcx>

Caches for opaque type inference.

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impl<'tcx> InferCtxtInner<'tcx>

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pub fn rollback_to(&mut self, snapshot: Snapshot<'tcx>)

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pub fn commit(&mut self, snapshot: Snapshot<'tcx>)

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impl<'tcx> InferCtxtInner<'tcx>

Trait Implementations§

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impl<'tcx> Clone for InferCtxtInner<'tcx>

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

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'tcx> Rollback<UndoLog<'tcx>> for InferCtxtInner<'tcx>

The Rollback trait defines how to rollback a particular action.

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

Auto Trait Implementations§

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impl<'tcx> DynSend for InferCtxtInner<'tcx>

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impl<'tcx> DynSync for InferCtxtInner<'tcx>

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impl<'tcx> !RefUnwindSafe for InferCtxtInner<'tcx>

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impl<'tcx> Send for InferCtxtInner<'tcx>

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impl<'tcx> Sync for InferCtxtInner<'tcx>

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impl<'tcx> Unpin for InferCtxtInner<'tcx>

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impl<'tcx> !UnwindSafe for InferCtxtInner<'tcx>

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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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> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where 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<P> IntoQueryParam<P> for P

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impl<T> MaybeResult<T> for T

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type Error = !

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fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<'tcx, T> ToPredicate<'tcx, T> for T

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fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T

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impl<T, U> TryFrom<U> for T
where 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 T
where 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.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed ) -> T

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T
where T: Send + Sync,

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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: 480 bytes