Enum chalk_ir::GoalData

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pub enum GoalData<I: Interner> {
    Quantified(QuantifierKind, Binders<Goal<I>>),
    Implies(ProgramClauses<I>, Goal<I>),
    All(Goals<I>),
    Not(Goal<I>),
    EqGoal(EqGoal<I>),
    SubtypeGoal(SubtypeGoal<I>),
    DomainGoal(DomainGoal<I>),
    CannotProve,
}
Expand description

A general goal; this is the full range of questions you can pose to Chalk.

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Quantified(QuantifierKind, Binders<Goal<I>>)

Introduces a binding at depth 0, shifting other bindings up (deBruijn index).

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Implies(ProgramClauses<I>, Goal<I>)

A goal that holds given some clauses (like an if-statement).

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All(Goals<I>)

List of goals that all should hold.

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Not(Goal<I>)

Negation: the inner goal should not hold.

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EqGoal(EqGoal<I>)

Make two things equal; the rules for doing so are well known to the logic

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SubtypeGoal(SubtypeGoal<I>)

Make one thing a subtype of another; the rules for doing so are well known to the logic

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DomainGoal(DomainGoal<I>)

A “domain goal” indicates some base sort of goal that can be proven via program clauses

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CannotProve

Indicates something that cannot be proven to be true or false definitively. This can occur with overflow but also with unifications of skolemized variables like forall<X,Y> { X = Y }. Of course, that statement is false, as there exist types X, Y where X = Y is not true. But we treat it as “cannot prove” so that forall<X,Y> { not { X = Y } } also winds up as cannot prove.

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impl<I: Interner> GoalData<I>

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

Create an interned goal.

Trait Implementations§

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impl<I: Clone + Interner> Clone for GoalData<I>

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

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type Interner = I

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

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fn eq(&self, other: &GoalData<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 GoalData<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> TypeVisitable<I> for GoalData<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 GoalData<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 GoalData<I>

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

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

Auto Trait Implementations§

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impl<I> Freeze for GoalData<I>

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impl<I> RefUnwindSafe for GoalData<I>

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impl<I> Send for GoalData<I>

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impl<I> Sync for GoalData<I>

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impl<I> Unpin for GoalData<I>

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impl<I> UnwindSafe for GoalData<I>

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> Cast for T

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

Cast a value to type U using CastTo.
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impl<T> CloneToUninit for T
where T: Copy,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T, I> CouldMatch<T> for T
where 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 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, I> Shift<I> for T
where 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 T
where 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 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<T, I> VisitExt<I> for T
where 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.