Enum chalk_solve::solve::Solution[−][src]

pub enum Solution<I: Interner> {
    Unique(Canonical<ConstrainedSubst<I>>),
    Ambig(Guidance<I>),
}
Expand description

A (possible) solution for a proposed goal.

Variants

The goal indeed holds, and there is a unique value for all existential variables. In this case, we also record a set of lifetime constraints which must also hold for the goal to be valid.

Ambig(Guidance<I>)

The goal may be provable in multiple ways, but regardless we may have some guidance for type inference. In this case, we don’t return any lifetime constraints, since we have not “committed” to any particular solution yet.

Implementations

impl<I: Interner> Solution<I>[src]

pub fn combine(self, other: Solution<I>, interner: &I) -> Solution<I>[src]

There are multiple candidate solutions, which may or may not agree on the values for existential variables; attempt to combine them. This operation does not depend on the order of its arguments.

pub fn into_guidance(self) -> Guidance<I>[src]

View this solution purely in terms of type inference guidance

pub fn constrained_subst(
    &self,
    interner: &I
) -> Option<Canonical<ConstrainedSubst<I>>>[src]

Extract a constrained substitution from this solution, even if ambiguous.

pub fn definite_subst(
    &self,
    interner: &I
) -> Option<Canonical<ConstrainedSubst<I>>>[src]

Determine whether this solution contains type information that must hold, and returns the subst in that case.

pub fn is_unique(&self) -> bool[src]

pub fn is_ambig(&self) -> bool[src]

pub fn display<'a>(&'a self, interner: &'a I) -> SolutionDisplay<'a, I>[src]

Trait Implementations

impl<I: Clone + Interner> Clone for Solution<I>[src]

fn clone(&self) -> Solution<I>[src]

Returns a copy of the value. Read more

fn clone_from(&mut self, source: &Self)1.0.0[src]

Performs copy-assignment from source. Read more

impl<I: Debug + Interner> Debug for Solution<I>[src]

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

Formats the value using the given formatter. Read more

impl<I: Interner> HasInterner for Solution<I>[src]

type Interner = I

The interner associated with the type.

impl<I: PartialEq + Interner> PartialEq<Solution<I>> for Solution<I>[src]

fn eq(&self, other: &Solution<I>) -> bool[src]

This method tests for self and other values to be equal, and is used by ==. Read more

fn ne(&self, other: &Solution<I>) -> bool[src]

This method tests for !=.

impl<I: Eq + Interner> Eq for Solution<I>[src]

impl<I: Interner> StructuralEq for Solution<I>[src]

impl<I: Interner> StructuralPartialEq for Solution<I>[src]

Auto Trait Implementations

impl<I> RefUnwindSafe for Solution<I> where
    <I as Interner>::InternedCanonicalVarKinds: RefUnwindSafe,
    <I as Interner>::InternedConstraints: RefUnwindSafe,
    <I as Interner>::InternedSubstitution: RefUnwindSafe, 

impl<I> Send for Solution<I> where
    <I as Interner>::InternedCanonicalVarKinds: Send,
    <I as Interner>::InternedConstraints: Send,
    <I as Interner>::InternedSubstitution: Send, 

impl<I> Sync for Solution<I> where
    <I as Interner>::InternedCanonicalVarKinds: Sync,
    <I as Interner>::InternedConstraints: Sync,
    <I as Interner>::InternedSubstitution: Sync, 

impl<I> Unpin for Solution<I> where
    <I as Interner>::InternedCanonicalVarKinds: Unpin,
    <I as Interner>::InternedConstraints: Unpin,
    <I as Interner>::InternedSubstitution: Unpin, 

impl<I> UnwindSafe for Solution<I> where
    <I as Interner>::InternedCanonicalVarKinds: UnwindSafe,
    <I as Interner>::InternedConstraints: UnwindSafe,
    <I as Interner>::InternedSubstitution: UnwindSafe, 

Blanket Implementations

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

pub fn type_id(&self) -> TypeId[src]

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T where
    T: ?Sized, [src]

pub fn borrow(&self) -> &T[src]

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T where
    T: ?Sized, [src]

pub fn borrow_mut(&mut self) -> &mut T[src]

Mutably borrows from an owned value. Read more

impl<T> Cast for T[src]

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

Cast a value to type U using CastTo.

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

pub fn equivalent(&self, key: &K) -> bool[src]

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

impl<T> From<T> for T[src]

pub fn from(t: T) -> T[src]

Performs the conversion.

impl<T> Instrument for T[src]

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

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

fn in_current_span(self) -> Instrumented<Self>[src]

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

impl<T, U> Into<U> for T where
    U: From<T>, [src]

pub fn into(self) -> U[src]

Performs the conversion.

impl<T> ToOwned for T where
    T: Clone, [src]

type Owned = T

The resulting type after obtaining ownership.

pub fn to_owned(&self) -> T[src]

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

pub fn clone_into(&self, target: &mut T)[src]

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

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

impl<T, U> TryFrom<U> for T where
    U: Into<T>, [src]

type Error = Infallible

The type returned in the event of a conversion error.

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

Performs the conversion.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, [src]

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

The type returned in the event of a conversion error.

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

Performs the conversion.