Struct chalk_engine::ExClause

source ·
pub struct ExClause<I: Interner> {
    pub subst: Substitution<I>,
    pub ambiguous: bool,
    pub constraints: Vec<InEnvironment<Constraint<I>>>,
    pub subgoals: Vec<Literal<I>>,
    pub delayed_subgoals: Vec<InEnvironment<Goal<I>>>,
    pub answer_time: TimeStamp,
    pub floundered_subgoals: Vec<FlounderedSubgoal<I>>,
}
Expand description

The paper describes these as A :- D | G.

Fields§

§subst: Substitution<I>

The substitution which, applied to the goal of our table, would yield A.

§ambiguous: bool

True if any subgoals were depended upon negatively and were not fully evaluated, or if we encountered a CannotProve goal. (In the full SLG algorithm, we would use delayed literals here, but we don’t bother, as we don’t need that support.)

§constraints: Vec<InEnvironment<Constraint<I>>>

Region constraints we have accumulated.

§subgoals: Vec<Literal<I>>

Subgoals: literals that must be proven

§delayed_subgoals: Vec<InEnvironment<Goal<I>>>

We assume that negative literals cannot have coinductive cycles.

§answer_time: TimeStamp

Time stamp that is incremented each time we find an answer to some subgoal. This is used to figure out whether any of the floundered subgoals may no longer be floundered: we record the current time when we add something to the list of floundered subgoals, and then we can compare whether its value has changed since then. This is not the same TimeStamp of Forest’s clock.

§floundered_subgoals: Vec<FlounderedSubgoal<I>>

List of subgoals that have floundered. See FlounderedSubgoal for more information.

Trait Implementations§

source§

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

source§

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

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
source§

impl<I: Debug + Interner> Debug for ExClause<I>

source§

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

Formats the value using the given formatter. Read more
source§

impl<I: Interner> HasInterner for ExClause<I>

§

type Interner = I

The interner associated with the type.
source§

impl<I: Hash + Interner> Hash for ExClause<I>

source§

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

Feeds this value into the given Hasher. Read more
1.3.0 · source§

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
source§

impl<I: PartialEq + Interner> PartialEq for ExClause<I>

source§

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

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

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.
source§

impl<I: Interner> TypeFoldable<I> for ExClause<I>

source§

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.
§

fn fold_with( self, folder: &mut dyn TypeFolder<I, Error = Infallible>, 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.
source§

impl<I: Interner> TypeVisitable<I> for ExClause<I>

source§

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.
source§

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

source§

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

Auto Trait Implementations§

§

impl<I> RefUnwindSafe for ExClause<I>
where <I as Interner>::InternedGoal: RefUnwindSafe, <I as Interner>::InternedLifetime: RefUnwindSafe, <I as Interner>::InternedProgramClauses: RefUnwindSafe, <I as Interner>::InternedSubstitution: RefUnwindSafe, <I as Interner>::InternedType: RefUnwindSafe,

§

impl<I> Send for ExClause<I>
where <I as Interner>::InternedGoal: Send, <I as Interner>::InternedLifetime: Send, <I as Interner>::InternedProgramClauses: Send, <I as Interner>::InternedSubstitution: Send, <I as Interner>::InternedType: Send,

§

impl<I> Sync for ExClause<I>
where <I as Interner>::InternedGoal: Sync, <I as Interner>::InternedLifetime: Sync, <I as Interner>::InternedProgramClauses: Sync, <I as Interner>::InternedSubstitution: Sync, <I as Interner>::InternedType: Sync,

§

impl<I> Unpin for ExClause<I>
where <I as Interner>::InternedGoal: Unpin, <I as Interner>::InternedLifetime: Unpin, <I as Interner>::InternedProgramClauses: Unpin, <I as Interner>::InternedSubstitution: Unpin, <I as Interner>::InternedType: Unpin,

§

impl<I> UnwindSafe for ExClause<I>
where <I as Interner>::InternedGoal: UnwindSafe, <I as Interner>::InternedLifetime: UnwindSafe, <I as Interner>::InternedProgramClauses: UnwindSafe, <I as Interner>::InternedSubstitution: UnwindSafe, <I as Interner>::InternedType: UnwindSafe,

Blanket Implementations§

source§

impl<T> Any for T
where T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for T
where T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
§

impl<T> Cast for T

§

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

Cast a value to type U using CastTo.
§

impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

§

fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
§

impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

§

fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

§

impl<T> Instrument for T

§

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided [Span], returning an Instrumented wrapper. Read more
§

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
source§

impl<T, U> Into<U> for T
where U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

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

§

impl<T, I> Shift<I> for T
where T: TypeFoldable<I>, I: Interner,

§

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

Shifts this term in one level of binders.
§

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.
§

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.
§

fn shifted_out(self, interner: I) -> Result<T, NoSolution>

Shifts this term out one level of binders.
source§

impl<T> ToOwned for T
where T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
§

impl<T, I> VisitExt<I> for T
where I: Interner, T: TypeVisitable<I>,

§

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

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

impl<T> WithSubscriber for T

§

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a [WithDispatch] wrapper. Read more
§

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a [WithDispatch] wrapper. Read more