Struct chalk_engine::Answer

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pub struct Answer<I: Interner> {
    pub subst: Canonical<AnswerSubst<I>>,
    pub ambiguous: bool,
}
Expand description

An “answer” in the on-demand solver corresponds to a fully solved goal for a particular table (modulo delayed literals). It contains a substitution

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§subst: Canonical<AnswerSubst<I>>

Contains values for the unbound inference variables for which the table is true, along with any delayed subgoals (Which must still be proven) and region constrained (which must still be proven, but not by chalk).

§ambiguous: bool

If this flag is set, then the answer could be neither proven nor disproven. This could be the size of the answer exceeded max_size or because of a negative loop (e.g., P :- not { P }).

Trait Implementations§

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

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fn clone(&self) -> Answer<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: Debug + Interner> Debug for Answer<I>

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<I> Freeze for Answer<I>
where <I as Interner>::InternedCanonicalVarKinds: Freeze, <I as Interner>::InternedSubstitution: Freeze, <I as Interner>::InternedConstraints: Freeze,

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impl<I> RefUnwindSafe for Answer<I>
where <I as Interner>::InternedCanonicalVarKinds: RefUnwindSafe, <I as Interner>::InternedSubstitution: RefUnwindSafe, <I as Interner>::InternedConstraints: RefUnwindSafe, <I as Interner>::InternedGoal: RefUnwindSafe, <I as Interner>::InternedProgramClauses: RefUnwindSafe,

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impl<I> Send for Answer<I>
where <I as Interner>::InternedCanonicalVarKinds: Send, <I as Interner>::InternedSubstitution: Send, <I as Interner>::InternedConstraints: Send, <I as Interner>::InternedGoal: Send, <I as Interner>::InternedProgramClauses: Send,

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impl<I> Sync for Answer<I>
where <I as Interner>::InternedCanonicalVarKinds: Sync, <I as Interner>::InternedSubstitution: Sync, <I as Interner>::InternedConstraints: Sync, <I as Interner>::InternedGoal: Sync, <I as Interner>::InternedProgramClauses: Sync,

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impl<I> Unpin for Answer<I>
where <I as Interner>::InternedCanonicalVarKinds: Unpin, <I as Interner>::InternedSubstitution: Unpin, <I as Interner>::InternedConstraints: Unpin, <I as Interner>::InternedGoal: Unpin, <I as Interner>::InternedProgramClauses: Unpin,

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impl<I> UnwindSafe for Answer<I>
where <I as Interner>::InternedCanonicalVarKinds: UnwindSafe, <I as Interner>::InternedSubstitution: UnwindSafe, <I as Interner>::InternedConstraints: UnwindSafe, <I as Interner>::InternedGoal: UnwindSafe, <I as Interner>::InternedProgramClauses: UnwindSafe,

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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 as HasInterner>::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: 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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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

Instruments this type with the provided [Span], returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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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> 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> WithSubscriber for T

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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
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fn with_current_subscriber(self) -> WithDispatch<Self>

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