Type Alias rustc_infer::traits::PredicateObligation
source · pub type PredicateObligation<'tcx> = Obligation<'tcx, Predicate<'tcx>>;
Aliased Type§
struct PredicateObligation<'tcx> {
pub cause: ObligationCause<'tcx>,
pub param_env: ParamEnv<'tcx>,
pub predicate: Predicate<'tcx>,
pub recursion_depth: usize,
}
Fields§
§cause: ObligationCause<'tcx>
The reason we have to prove this thing.
param_env: ParamEnv<'tcx>
The environment in which we should prove this thing.
predicate: Predicate<'tcx>
The thing we are trying to prove.
recursion_depth: usize
If we started proving this as a result of trying to prove something else, track the total depth to ensure termination. If this goes over a certain threshold, we abort compilation – in such cases, we can not say whether or not the predicate holds for certain. Stupid halting problem; such a drag.
Implementations§
source§impl<'tcx> PredicateObligation<'tcx>
impl<'tcx> PredicateObligation<'tcx>
sourcepub fn flip_polarity(
&self,
tcx: TyCtxt<'tcx>
) -> Option<PredicateObligation<'tcx>>
pub fn flip_polarity( &self, tcx: TyCtxt<'tcx> ) -> Option<PredicateObligation<'tcx>>
Flips the polarity of the inner predicate.
Given T: Trait
predicate it returns T: !Trait
and given T: !Trait
returns T: Trait
.
source§impl<'tcx, O> Obligation<'tcx, O>
impl<'tcx, O> Obligation<'tcx, O>
pub fn new( tcx: TyCtxt<'tcx>, cause: ObligationCause<'tcx>, param_env: ParamEnv<'tcx>, predicate: impl ToPredicate<'tcx, O> ) -> Obligation<'tcx, O>
sourcepub fn set_depth_from_parent(&mut self, parent_depth: usize)
pub fn set_depth_from_parent(&mut self, parent_depth: usize)
We often create nested obligations without setting the correct depth.
To deal with this evaluate and fulfill explicitly update the depth of nested obligations using this function.
pub fn with_depth( tcx: TyCtxt<'tcx>, cause: ObligationCause<'tcx>, recursion_depth: usize, param_env: ParamEnv<'tcx>, predicate: impl ToPredicate<'tcx, O> ) -> Obligation<'tcx, O>
pub fn misc( tcx: TyCtxt<'tcx>, span: Span, body_id: LocalDefId, param_env: ParamEnv<'tcx>, trait_ref: impl ToPredicate<'tcx, O> ) -> Obligation<'tcx, O>
pub fn with<P>( &self, tcx: TyCtxt<'tcx>, value: impl ToPredicate<'tcx, P> ) -> Obligation<'tcx, P>
Trait Implementations§
source§impl<'tcx, T: Clone> Clone for Obligation<'tcx, T>
impl<'tcx, T: Clone> Clone for Obligation<'tcx, T>
source§fn clone(&self) -> Obligation<'tcx, T>
fn clone(&self) -> Obligation<'tcx, T>
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl<'tcx, O: Debug> Debug for Obligation<'tcx, O>
impl<'tcx, O: Debug> Debug for Obligation<'tcx, O>
source§impl<'tcx> Elaboratable<'tcx> for PredicateObligation<'tcx>
impl<'tcx> Elaboratable<'tcx> for PredicateObligation<'tcx>
source§impl<T: Hash> Hash for Obligation<'_, T>
impl<T: Hash> Hash for Obligation<'_, T>
source§impl<'tcx, T: PartialEq> PartialEq<Obligation<'tcx, T>> for Obligation<'tcx, T>
impl<'tcx, T: PartialEq> PartialEq<Obligation<'tcx, T>> for Obligation<'tcx, T>
source§fn eq(&self, other: &Obligation<'tcx, T>) -> bool
fn eq(&self, other: &Obligation<'tcx, T>) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl<'tcx, O: TypeFoldable<TyCtxt<'tcx>>> TypeFoldable<TyCtxt<'tcx>> for Obligation<'tcx, O>
impl<'tcx, O: TypeFoldable<TyCtxt<'tcx>>> TypeFoldable<TyCtxt<'tcx>> for Obligation<'tcx, O>
source§fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>(
self,
folder: &mut F
) -> Result<Self, F::Error>
fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>( self, folder: &mut F ) -> Result<Self, F::Error>
source§fn fold_with<F>(self, folder: &mut F) -> Selfwhere
F: TypeFolder<I>,
fn fold_with<F>(self, folder: &mut F) -> Selfwhere F: TypeFolder<I>,
try_fold_with
for use with infallible
folders. Do not override this method, to ensure coherence with
try_fold_with
.source§impl<'tcx, O: TypeVisitable<TyCtxt<'tcx>>> TypeVisitable<TyCtxt<'tcx>> for Obligation<'tcx, O>
impl<'tcx, O: TypeVisitable<TyCtxt<'tcx>>> TypeVisitable<TyCtxt<'tcx>> for Obligation<'tcx, O>
source§fn visit_with<V: TypeVisitor<TyCtxt<'tcx>>>(
&self,
visitor: &mut V
) -> ControlFlow<V::BreakTy>
fn visit_with<V: TypeVisitor<TyCtxt<'tcx>>>( &self, visitor: &mut V ) -> ControlFlow<V::BreakTy>
impl<T: Eq> Eq for Obligation<'_, T>
Layout§
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.
Size: 48 bytes