# Struct rustc_infer::infer::relate::lub::Lub

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    pub struct Lub<'combine, 'infcx, 'tcx> {
        fields: &'combine mut CombineFields<'infcx, 'tcx>,
    }

Expand description

“Least upper bound” (common supertype)

## Fields§

§`fields: &'combine mut CombineFields<'infcx, 'tcx>`

## Implementations§

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### impl<'combine, 'infcx, 'tcx> Lub<'combine, 'infcx, 'tcx>

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#### pub fn new( fields: &'combine mut CombineFields<'infcx, 'tcx>, ) -> Lub<'combine, 'infcx, 'tcx>

## Trait Implementations§

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### impl<'combine, 'infcx, 'tcx> LatticeDir<'infcx, 'tcx> for Lub<'combine, 'infcx, 'tcx>

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#### fn infcx(&self) -> &'infcx InferCtxt<'tcx>

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#### fn cause(&self) -> &ObligationCause<'tcx>

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#### fn relate_bound( &mut self, v: Ty<'tcx>, a: Ty<'tcx>, b: Ty<'tcx>, ) -> RelateResult<'tcx, ()>

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#### fn define_opaque_types(&self) -> DefineOpaqueTypes

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### impl<'tcx> PredicateEmittingRelation<InferCtxt<'tcx>> for Lub<'_, '_, 'tcx>

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#### fn span(&self) -> Span

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#### fn structurally_relate_aliases(&self) -> StructurallyRelateAliases

Whether aliases should be related structurally. This is pretty much always `No` unless you’re equating in some specific locations of the new solver. See the comments in these use-cases for more details.
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#### fn param_env(&self) -> ParamEnv<'tcx>

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#### fn register_predicates( &mut self, obligations: impl IntoIterator<Item: Upcast<TyCtxt<'tcx>, Predicate<'tcx>>>, )

Register predicates that must hold in order for this relation to hold. This uses the default `param_env` of the obligation.
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#### fn register_goals( &mut self, obligations: impl IntoIterator<Item = Goal<'tcx, Predicate<'tcx>>>, )

Register obligations that must hold in order for this relation to hold
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#### fn register_alias_relate_predicate(&mut self, a: Ty<'tcx>, b: Ty<'tcx>)

Register `AliasRelate` obligation(s) that both types must be related to each other.
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### impl<'tcx> TypeRelation<TyCtxt<'tcx>> for Lub<'_, '_, 'tcx>

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#### fn tag(&self) -> &'static str

Returns a static string we can use for printouts.
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#### fn tcx(&self) -> TyCtxt<'tcx>

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#### fn relate_with_variance<T: Relate<TyCtxt<'tcx>>>( &mut self, variance: Variance, _info: VarianceDiagInfo<TyCtxt<'tcx>>, a: T, b: T, ) -> RelateResult<'tcx, T>

Switch variance for the purpose of relating `a` and `b`.
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#### fn tys(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>>

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#### fn regions( &mut self, a: Region<'tcx>, b: Region<'tcx>, ) -> RelateResult<'tcx, Region<'tcx>>

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#### fn consts( &mut self, a: Const<'tcx>, b: Const<'tcx>, ) -> RelateResult<'tcx, Const<'tcx>>

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#### fn binders<T>( &mut self, a: Binder<'tcx, T>, b: Binder<'tcx, T>, ) -> RelateResult<'tcx, Binder<'tcx, T>>
where T: Relate<TyCtxt<'tcx>>,

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#### fn relate<T>(&mut self, a: T, b: T) -> Result<T, TypeError<I>>
where T: Relate<I>,

Generic relation routine suitable for most anything.
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#### fn relate_item_args( &mut self, item_def_id: <I as Interner>::DefId, a_arg: <I as Interner>::GenericArgs, b_arg: <I as Interner>::GenericArgs, ) -> Result<<I as Interner>::GenericArgs, TypeError<I>>

Relate the two args for the given item. The default is to look up the variance for the item and proceed accordingly.

## Auto Trait Implementations§

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### impl<'combine, 'infcx, 'tcx> !DynSend for Lub<'combine, 'infcx, 'tcx>

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### impl<'combine, 'infcx, 'tcx> !DynSync for Lub<'combine, 'infcx, 'tcx>

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### impl<'combine, 'infcx, 'tcx> Freeze for Lub<'combine, 'infcx, 'tcx>

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### impl<'combine, 'infcx, 'tcx> !RefUnwindSafe for Lub<'combine, 'infcx, 'tcx>

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### impl<'combine, 'infcx, 'tcx> !Send for Lub<'combine, 'infcx, 'tcx>

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### impl<'combine, 'infcx, 'tcx> !Sync for Lub<'combine, 'infcx, 'tcx>

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### impl<'combine, 'infcx, 'tcx> Unpin for Lub<'combine, 'infcx, 'tcx>

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### impl<'combine, 'infcx, 'tcx> !UnwindSafe for Lub<'combine, 'infcx, '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<T> IntoEither for T

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#### fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left` is `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
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#### fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left(&self)` returns `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
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### impl<P> IntoQueryParam<P> for P

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#### fn into_query_param(self) -> 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, 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<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

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#### fn upcast(self, interner: I) -> U

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### impl<I, T> UpcastFrom<I, T> for T

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#### fn upcast_from(from: T, _tcx: I) -> T

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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,

## 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: 8 bytes