## NllTypeRelating

# Struct NllTypeRelating

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    struct NllTypeRelating<'a, 'b, 'tcx> {
        type_checker: &'a mut TypeChecker<'b, 'tcx>,
        locations: Locations,
        category: ConstraintCategory<'tcx>,
        universe_info: UniverseInfo<'tcx>,
        ambient_variance: Variance,
        ambient_variance_info: VarianceDiagInfo<TyCtxt<'tcx>>,
    }

## Fields§

§`type_checker: &'a mut TypeChecker<'b, 'tcx>`§`locations: Locations`

Where (and why) is this relation taking place?

§`category: ConstraintCategory<'tcx>`

What category do we assign the resulting `'a: 'b` relationships?

§`universe_info: UniverseInfo<'tcx>`

Information so that error reporting knows what types we are relating when reporting a bound region error.

§`ambient_variance: Variance`

How are we relating `a` and `b`?

- Covariant means `a <: b`.
- Contravariant means `b <: a`.
- Invariant means `a == b`.
- Bivariant means that it doesn’t matter.

§`ambient_variance_info: VarianceDiagInfo<TyCtxt<'tcx>>`

## Implementations§

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### impl<'a, 'b, 'tcx> NllTypeRelating<'a, 'b, 'tcx>

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#### fn new( type_checker: &'a mut TypeChecker<'b, 'tcx>, locations: Locations, category: ConstraintCategory<'tcx>, universe_info: UniverseInfo<'tcx>, ambient_variance: Variance, ) -> Self

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#### fn ambient_covariance(&self) -> bool

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#### fn ambient_contravariance(&self) -> bool

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

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#### fn enter_forall<T, U>( &mut self, binder: Binder<'tcx, T>, f: impl FnOnce(&mut Self, T) -> U, ) -> U
where T: TypeFoldable<TyCtxt<'tcx>> + Copy,

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#### fn instantiate_binder_with_existentials<T>( &mut self, binder: Binder<'tcx, T>, ) -> T
where T: TypeFoldable<TyCtxt<'tcx>> + Copy,

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#### fn create_next_universe(&mut self) -> UniverseIndex

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#### fn next_existential_region_var(&mut self, name: Option<Symbol>) -> Region<'tcx>

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#### fn next_placeholder_region( &mut self, placeholder: PlaceholderRegion<'tcx>, ) -> Region<'tcx>

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#### fn push_outlives( &mut self, sup: Region<'tcx>, sub: Region<'tcx>, info: VarianceDiagInfo<TyCtxt<'tcx>>, )

## Trait Implementations§

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### impl<'b, 'tcx> PredicateEmittingRelation<InferCtxt<'tcx>> for NllTypeRelating<'_, 'b, '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<'b, 'tcx> TypeRelation<TyCtxt<'tcx>> for NllTypeRelating<'_, 'b, 'tcx>

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#### fn cx(&self) -> TyCtxt<'tcx>

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#### fn relate_ty_args( &mut self, a_ty: Ty<'tcx>, b_ty: Ty<'tcx>, def_id: DefId, a_args: GenericArgsRef<'tcx>, b_args: GenericArgsRef<'tcx>, _: impl FnOnce(GenericArgsRef<'tcx>) -> Ty<'tcx>, ) -> RelateResult<'tcx, Ty<'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.

## Auto Trait Implementations§

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### impl<'a, 'b, 'tcx> !DynSend for NllTypeRelating<'a, 'b, 'tcx>

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### impl<'a, 'b, 'tcx> !DynSync for NllTypeRelating<'a, 'b, 'tcx>

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### impl<'a, 'b, 'tcx> Freeze for NllTypeRelating<'a, 'b, 'tcx>

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### impl<'a, 'b, 'tcx> !RefUnwindSafe for NllTypeRelating<'a, 'b, 'tcx>

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### impl<'a, 'b, 'tcx> !Send for NllTypeRelating<'a, 'b, 'tcx>

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### impl<'a, 'b, 'tcx> !Sync for NllTypeRelating<'a, 'b, 'tcx>

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### impl<'a, 'b, 'tcx> Unpin for NllTypeRelating<'a, 'b, 'tcx>

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### impl<'a, 'b, 'tcx> !UnwindSafe for NllTypeRelating<'a, 'b, '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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#### 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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#### fn from(t: T) -> T

Returns the argument unchanged.

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Instruments this type with the provided `Span`, returning an `Instrumented` wrapper. Read more
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#### fn into(self) -> U

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That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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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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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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#### type 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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Dereferences the given pointer. Read more
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Drops the object pointed to by the given pointer. Read more
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#### type Output = T

Should always be `Self`
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#### type Error = Infallible

The type returned in the event of a conversion error.
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Performs the conversion.
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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
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#### fn upcast(self, interner: I) -> U

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## 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: 88 bytes