# Struct rustc_infer::infer::relate::equate::Equate

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

Expand description

Ensures `a` is made equal to `b`. Returns `a` on success.

## Fields§

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

## Implementations§

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

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

## Trait Implementations§

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### impl<'tcx> ObligationEmittingRelation<'tcx> for Equate<'_, '_, 'tcx>

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#### fn param_env(&self) -> ParamEnv<'tcx>

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

Register predicates that must hold in order for this relation to hold. Uses a default obligation cause, `ObligationEmittingRelation::register_obligations` should be used if control over the obligation causes is required.
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#### fn register_obligations(&mut self, obligations: PredicateObligations<'tcx>)

Register obligations that must hold in order for this relation to hold
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#### fn alias_relate_direction(&self) -> AliasRelationDirection

Relation direction emitted for `AliasRelate` predicates, corresponding to the direction of the relation.
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#### fn register_type_relate_obligation(&mut self, a: Ty<'tcx>, b: Ty<'tcx>)

Register an obligation that both types must be related to each other according to the `ty::AliasRelationDirection` given by `ObligationEmittingRelation::alias_relate_direction`
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### impl<'tcx> TypeRelation<'tcx> for Equate<'_, '_, '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 a_is_expected(&self) -> bool

Returns `true` if the value `a` is the “expected” type in the relation. Just affects error messages.
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#### fn relate_item_args( &mut self, _item_def_id: DefId, a_arg: GenericArgsRef<'tcx>, b_arg: GenericArgsRef<'tcx> ) -> RelateResult<'tcx, GenericArgsRef<'tcx>>

Relate the two args for the given item. The default is to look up the variance for the item and proceed accordingly.
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#### fn relate_with_variance<T: Relate<'tcx>>( &mut self, _: Variance, _info: VarianceDiagInfo<'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<'tcx>,

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#### fn with_cause<F, R>(&mut self, _cause: Cause, f: F) -> R
where F: FnOnce(&mut Self) -> R,

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#### fn relate<T>(&mut self, a: T, b: T) -> Result<T, TypeError<'tcx>>
where T: Relate<'tcx>,

Generic relation routine suitable for most anything.

## Auto Trait Implementations§

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

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

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

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

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### impl<'combine, 'infcx, 'tcx> !UnwindSafe for Equate<'combine, 'infcx, 'tcx>

## Blanket Implementations§

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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> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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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, 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.

## 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