pub struct TypeVariableTable<'a, 'tcx> {
    storage: &'a mut TypeVariableStorage<'tcx>,
    undo_log: &'a mut InferCtxtUndoLogs<'tcx>,
}

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§storage: &'a mut TypeVariableStorage<'tcx>§undo_log: &'a mut InferCtxtUndoLogs<'tcx>

Implementations§

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impl<'tcx> TypeVariableTable<'_, 'tcx>

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pub fn var_origin(&self, vid: TyVid) -> TypeVariableOrigin

Returns the origin that was given when vid was created.

Note that this function does not return care whether vid has been unified with something else or not.

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pub fn equate(&mut self, a: TyVid, b: TyVid)

Records that a == b, depending on dir.

Precondition: neither a nor b are known.

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pub fn instantiate(&mut self, vid: TyVid, ty: Ty<'tcx>)

Instantiates vid with the type ty.

Precondition: vid must not have been previously instantiated.

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pub fn new_var( &mut self, universe: UniverseIndex, origin: TypeVariableOrigin ) -> TyVid

Creates a new type variable.

  • diverging: indicates if this is a “diverging” type variable, e.g., one created as the type of a return expression. The code in this module doesn’t care if a variable is diverging, but the main Rust type-checker will sometimes “unify” such variables with the ! or () types.
  • origin: indicates why the type variable was created. The code in this module doesn’t care, but it can be useful for improving error messages.
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pub fn num_vars(&self) -> usize

Returns the number of type variables created thus far.

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pub fn root_var(&mut self, vid: TyVid) -> TyVid

Returns the “root” variable of vid in the eq_relations equivalence table. All type variables that have been equated will yield the same root variable (per the union-find algorithm), so root_var(a) == root_var(b) implies that a == b (transitively).

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pub fn probe(&mut self, vid: TyVid) -> TypeVariableValue<'tcx>

Retrieves the type to which vid has been instantiated, if any.

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pub fn inlined_probe(&mut self, vid: TyVid) -> TypeVariableValue<'tcx>

An always-inlined variant of probe, for very hot call sites.

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pub fn replace_if_possible(&mut self, t: Ty<'tcx>) -> Ty<'tcx>

If t is a type-inference variable, and it has been instantiated, then return the with which it was instantiated. Otherwise, returns t.

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fn eq_relations( &mut self ) -> UnificationTable<InPlace<TyVidEqKey<'tcx>, &'_ mut UnificationStorage<TyVidEqKey<'tcx>>, &'_ mut InferCtxtUndoLogs<'tcx>>>

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pub fn vars_since_snapshot( &mut self, value_count: usize ) -> (Range<TyVid>, Vec<TypeVariableOrigin>)

Returns a range of the type variables created during the snapshot.

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pub fn unresolved_variables(&mut self) -> Vec<TyVid>

Returns indices of all variables that are not yet instantiated.

Auto Trait Implementations§

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impl<'a, 'tcx> DynSend for TypeVariableTable<'a, 'tcx>

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impl<'a, 'tcx> DynSync for TypeVariableTable<'a, 'tcx>

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impl<'a, 'tcx> !RefUnwindSafe for TypeVariableTable<'a, 'tcx>

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impl<'a, 'tcx> Send for TypeVariableTable<'a, 'tcx>

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impl<'a, 'tcx> Sync for TypeVariableTable<'a, 'tcx>

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impl<'a, 'tcx> Unpin for TypeVariableTable<'a, 'tcx>

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impl<'a, 'tcx> !UnwindSafe for TypeVariableTable<'a, 'tcx>

Blanket Implementations§

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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<'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,

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: 16 bytes