Struct Goal

pub struct Goal<I: Interner, P> {
    pub param_env: I::ParamEnv,
    pub predicate: P,
}

A goal is a statement, i.e. predicate, we want to prove given some assumptions, i.e. param_env.

Most of the time the param_env contains the where-bounds of the function we’re currently typechecking while the predicate is some trait bound.

Fields

param_env: I::ParamEnv

predicate: P

Implementations

impl<I: Interner, P> Goal<I, P>

pub fn new( cx: I, param_env: I::ParamEnv, predicate: impl Upcast<I, P>, ) -> Goal<I, P>

pub fn with<Q>(self, cx: I, predicate: impl Upcast<I, Q>) -> Goal<I, Q>

Updates the goal to one with a different predicate but the same param_env.

Trait Implementations

impl<I, P> Clone for Goal<I, P>

where I: Interner, P: Clone,

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<I, P> Debug for Goal<I, P>

where I: Interner, P: Debug,

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

Formats the value using the given formatter.

impl<I: Interner, P, __D: TyDecoder<I = I>> Decodable<__D> for Goal<I, P>

where I::ParamEnv: Decodable<__D>, P: Decodable<__D>,

fn decode(__decoder: &mut __D) -> Self

impl<I: Interner, P, __E: TyEncoder<I = I>> Encodable<__E> for Goal<I, P>

where I::ParamEnv: Encodable<__E>, P: Encodable<__E>,

fn encode(&self, __encoder: &mut __E)

impl<I, P> Hash for Goal<I, P>

where I: Interner, P: Hash,

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<I: Interner, P, __CTX> HashStable<__CTX> for Goal<I, P>

where I::ParamEnv: HashStable<__CTX>, P: HashStable<__CTX>,

fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

impl<I, P, J> Lift<J> for Goal<I, P>

where I: Interner, J: Interner, I::ParamEnv: Lift<J, Lifted = J::ParamEnv>, P: Lift<J, Lifted = P>,

type Lifted = Goal<J, P>

fn lift_to_interner(self, interner: J) -> Option<Self::Lifted>

impl<I, P> PartialEq for Goal<I, P>

where I: Interner, P: PartialEq,

fn eq(&self, __other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<I, P> TypeFoldable<I> for Goal<I, P>

where I: Interner, I::ParamEnv: TypeFoldable<I>, P: TypeFoldable<I>,

fn try_fold_with<__F: FallibleTypeFolder<I>>( self, __folder: &mut __F, ) -> Result<Self, __F::Error>

The entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f).

fn fold_with<F: TypeFolder<I>>(self, folder: &mut F) -> 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.

impl<I, P> TypeVisitable<I> for Goal<I, P>

where I: Interner, I::ParamEnv: TypeVisitable<I>, P: TypeVisitable<I>,

fn visit_with<__V: TypeVisitor<I>>(&self, __visitor: &mut __V) -> __V::Result

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v).

impl<I, P> Copy for Goal<I, P>

where I: Interner, P: Copy,

impl<I, P> Eq for Goal<I, P>

where I: Interner, P: Eq,

Layout

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.