pub enum WhereClause<I: Interner> {
    Implemented(TraitRef<I>),
    AliasEq(AliasEq<I>),
    LifetimeOutlives(LifetimeOutlives<I>),
    TypeOutlives(TypeOutlives<I>),
}
Expand description

Where clauses that can be written by a Rust programmer.

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Implemented(TraitRef<I>)

Type implements a trait.

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AliasEq(AliasEq<I>)

Type is equal to an alias.

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LifetimeOutlives(LifetimeOutlives<I>)

One lifetime outlives another.

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TypeOutlives(TypeOutlives<I>)

Type outlives a lifetime.

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impl<I: Interner> WhereClause<I>

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pub fn into_well_formed_goal(self, interner: I) -> DomainGoal<I>

Turn a where clause into the WF version of it i.e.:

  • Implemented(T: Trait) maps to WellFormed(T: Trait)
  • ProjectionEq(<T as Trait>::Item = Foo) maps to WellFormed(<T as Trait>::Item = Foo)
  • any other clause maps to itself
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pub fn into_from_env_goal(self, interner: I) -> DomainGoal<I>

Same as into_well_formed_goal but with the FromEnv predicate instead of WellFormed.

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pub fn trait_id(&self) -> Option<TraitId<I>>

If where clause is a TraitRef, returns its trait id.

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impl<I: Interner> CastTo<WhereClause<I>> for AliasEq<I>

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fn cast_to(self, _interner: I) -> WhereClause<I>

Cast a value to type T.
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impl<I: Interner> CastTo<WhereClause<I>> for LifetimeOutlives<I>

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fn cast_to(self, _interner: I) -> WhereClause<I>

Cast a value to type T.
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impl<I: Interner> CastTo<WhereClause<I>> for TraitRef<I>

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fn cast_to(self, _interner: I) -> WhereClause<I>

Cast a value to type T.
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impl<I: Interner> CastTo<WhereClause<I>> for TypeOutlives<I>

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fn cast_to(self, _interner: I) -> WhereClause<I>

Cast a value to type T.
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impl<I: Interner> CastTo<WhereClause<I>> for WhereClause<I>

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fn cast_to( self, _interner: <WhereClause<I> as HasInterner>::Interner ) -> WhereClause<I>

Cast a value to type T.
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impl<I: Clone + Interner> Clone for WhereClause<I>

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fn clone(&self) -> WhereClause<I>

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: Interner> Debug for WhereClause<I>

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

Formats the value using the given formatter. Read more
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impl<I: Interner> HasInterner for WhereClause<I>

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type Interner = I

The interner associated with the type.
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impl<I: Hash + Interner> Hash for WhereClause<I>

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<I: PartialEq + Interner> PartialEq for WhereClause<I>

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fn eq(&self, other: &WhereClause<I>) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<I: Interner> TypeFoldable<I> for WhereClause<I>

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fn try_fold_with<E>( self, folder: &mut dyn FallibleTypeFolder<I, Error = E>, outer_binder: DebruijnIndex ) -> Result<Self, E>

Apply the given folder folder to self; binders is the number of binders that are in scope when beginning the folder. Typically binders starts as 0, but is adjusted when we encounter Binders<T> in the IR or other similar constructs.
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fn fold_with( self, folder: &mut dyn TypeFolder<I>, outer_binder: DebruijnIndex ) -> Self

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: Interner> TypeSuperVisitable<I> for WhereClause<I>

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fn super_visit_with<B>( &self, visitor: &mut dyn TypeVisitor<I, BreakTy = B>, outer_binder: DebruijnIndex ) -> ControlFlow<B>

Recursively visits the type contents.
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impl<I: Interner> TypeVisitable<I> for WhereClause<I>

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fn visit_with<B>( &self, visitor: &mut dyn TypeVisitor<I, BreakTy = B>, outer_binder: DebruijnIndex ) -> ControlFlow<B>

Apply the given visitor visitor to self; binders is the number of binders that are in scope when beginning the visitor. Typically binders starts as 0, but is adjusted when we encounter Binders<T> in the IR or other similar constructs.
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impl<I: Interner> Zip<I> for WhereClause<I>

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fn zip_with<Z: Zipper<I>>( zipper: &mut Z, variance: Variance, a: &Self, b: &Self ) -> Fallible<()>

Uses the zipper to walk through two values, ensuring that they match.
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impl<I: Interner> Copy for WhereClause<I>where I::InternedSubstitution: Copy, I::InternedLifetime: Copy, I::InternedType: Copy,

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impl<I: Eq + Interner> Eq for WhereClause<I>

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impl<I: Interner> StructuralEq for WhereClause<I>

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impl<I: Interner> StructuralPartialEq for WhereClause<I>

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere 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 Twhere 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 Twhere 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> Cast for T

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fn cast<U>(self, interner: U::Interner) -> Uwhere Self: CastTo<U>, U: HasInterner,

Cast a value to type U using CastTo.
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impl<T, I> CastTo<DomainGoal<I>> for Twhere T: CastTo<WhereClause<I>>, I: Interner,

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fn cast_to(self, interner: I) -> DomainGoal<I>

Cast a value to type T.
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impl<T, I> CastTo<Goal<I>> for Twhere I: Interner, T: CastTo<DomainGoal<I>>,

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fn cast_to(self, interner: I) -> Goal<I>

Cast a value to type T.
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impl<T, I> CastTo<ProgramClause<I>> for Twhere T: CastTo<DomainGoal<I>>, I: Interner,

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fn cast_to(self, interner: I) -> ProgramClause<I>

Cast a value to type T.
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impl<T, I> CouldMatch<T> for Twhere T: Zip<I> + HasInterner<Interner = I> + ?Sized, I: Interner,

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fn could_match( &self, interner: I, db: &dyn UnificationDatabase<I>, other: &T ) -> bool

Checks whether self and other could possibly match.
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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 Twhere 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, I> Shift<I> for Twhere T: TypeFoldable<I>, I: Interner,

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fn shifted_in(self, interner: I) -> T

Shifts this term in one level of binders.
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fn shifted_in_from(self, interner: I, source_binder: DebruijnIndex) -> T

Shifts a term valid at outer_binder so that it is valid at the innermost binder. See DebruijnIndex::shifted_in_from for a detailed explanation.
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fn shifted_out_to( self, interner: I, target_binder: DebruijnIndex ) -> Result<T, NoSolution>

Shifts a term valid at the innermost binder so that it is valid at outer_binder. See DebruijnIndex::shifted_out_to for a detailed explanation.
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fn shifted_out(self, interner: I) -> Result<T, NoSolution>

Shifts this term out one level of binders.
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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere 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 Twhere 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<T, I> VisitExt<I> for Twhere I: Interner, T: TypeVisitable<I>,

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fn has_free_vars(&self, interner: I) -> bool

Check whether there are free (non-bound) variables.