Struct rustc_next_trait_solver::solve::eval_ctxt::NestedGoals

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struct NestedGoals<I: Interner> {
    pub normalizes_to_goals: Vec<Goal<I, NormalizesTo<I>>>,
    pub goals: Vec<(GoalSource, Goal<I, I::Predicate>)>,
}

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§normalizes_to_goals: Vec<Goal<I, NormalizesTo<I>>>

These normalizes-to goals are treated specially during the evaluation loop. In each iteration we take the RHS of the projection, replace it with a fresh inference variable, and only after evaluating that goal do we equate the fresh inference variable with the actual RHS of the predicate.

This is both to improve caching, and to avoid using the RHS of the projection predicate to influence the normalizes-to candidate we select.

Forgetting to replace the RHS with a fresh inference variable when we evaluate this goal results in an ICE..

§goals: Vec<(GoalSource, Goal<I, I::Predicate>)>

The rest of the goals which have not yet processed or remain ambiguous.

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impl<I: Interner> NestedGoals<I>

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fn new() -> Self

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fn is_empty(&self) -> bool

Trait Implementations§

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impl<I> Clone for NestedGoals<I>
where I: Interner,

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fn clone(&self) -> Self

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<I> Debug for NestedGoals<I>
where I: Interner,

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fn fmt(&self, __f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<I: Interner, __D: TyDecoder<I = I>> Decodable<__D> for NestedGoals<I>
where Vec<Goal<I, NormalizesTo<I>>>: Decodable<__D>, Vec<(GoalSource, Goal<I, I::Predicate>)>: Decodable<__D>,

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fn decode(__decoder: &mut __D) -> Self

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impl<I> Default for NestedGoals<I>
where I: Interner,

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<I: Interner, __E: TyEncoder<I = I>> Encodable<__E> for NestedGoals<I>
where Vec<Goal<I, NormalizesTo<I>>>: Encodable<__E>, Vec<(GoalSource, Goal<I, I::Predicate>)>: Encodable<__E>,

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fn encode(&self, __encoder: &mut __E)

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impl<I: Interner, __CTX> HashStable<__CTX> for NestedGoals<I>
where Vec<Goal<I, NormalizesTo<I>>>: HashStable<__CTX>, Vec<(GoalSource, Goal<I, I::Predicate>)>: HashStable<__CTX>,

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fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

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impl<I, J> Lift<J> for NestedGoals<I>
where I: Interner, J: Interner, Vec<Goal<I, NormalizesTo<I>>>: Lift<J, Lifted = Vec<Goal<J, NormalizesTo<J>>>>, Vec<(GoalSource, Goal<I, I::Predicate>)>: Lift<J, Lifted = Vec<(GoalSource, Goal<J, J::Predicate>)>>,

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type Lifted = NestedGoals<J>

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fn lift_to_interner(self, interner: J) -> Option<Self::Lifted>

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impl<I> TypeFoldable<I> for NestedGoals<I>

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fn try_fold_with<__F: FallibleTypeFolder<I>>( self, __folder: &mut __F, ) -> Result<Self, __F::Error>

The entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f). Read more
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fn fold_with<F>(self, folder: &mut F) -> Self
where F: TypeFolder<I>,

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.
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impl<I> TypeVisitable<I> for NestedGoals<I>

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fn visit_with<__V: TypeVisitor<I>>(&self, __visitor: &mut __V) -> __V::Result

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v). Read more

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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fn collect_and_apply<I, F>(iter: I, f: F) -> R
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Calls U::from(self).

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fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool

Returns true if self has any late-bound regions that are either bound by binder or bound by some binder outside of binder. If binder is ty::INNERMOST, this indicates whether there are any late-bound regions that appear free.
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fn references_error(&self) -> bool

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fn has_non_region_param(&self) -> bool

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fn has_infer_regions(&self) -> bool

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fn has_infer_types(&self) -> bool

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fn has_non_region_infer(&self) -> bool

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fn has_infer(&self) -> bool

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fn has_placeholders(&self) -> bool

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fn has_non_region_placeholders(&self) -> bool

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fn has_param(&self) -> bool

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fn has_free_regions(&self) -> bool

“Free” regions in this context means that it has any region that is not (a) erased or (b) late-bound.
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fn has_erased_regions(&self) -> bool

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True if there are any un-erased free regions.
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True if there are any late-bound non-region variables
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True if there are any bound variables
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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: 48 bytes