Struct rustc_infer::traits::ObligationCause
source · pub struct ObligationCause<'tcx> {
pub span: Span,
pub body_id: LocalDefId,
code: InternedObligationCauseCode<'tcx>,
}
Expand description
The reason why we incurred this obligation; used for error reporting.
Non-misc ObligationCauseCode
s are stored on the heap. This gives the
best trade-off between keeping the type small (which makes copies cheaper)
while not doing too many heap allocations.
We do not want to intern this as there are a lot of obligation causes which only live for a short period of time.
Fields§
§span: Span
§body_id: LocalDefId
The ID of the fn body that triggered this obligation. This is
used for region obligations to determine the precise
environment in which the region obligation should be evaluated
(in particular, closures can add new assumptions). See the
field region_obligations
of the FulfillmentContext
for more
information.
code: InternedObligationCauseCode<'tcx>
Implementations§
source§impl<'tcx> ObligationCause<'tcx>
impl<'tcx> ObligationCause<'tcx>
pub fn new( span: Span, body_id: LocalDefId, code: ObligationCauseCode<'tcx>, ) -> ObligationCause<'tcx>
pub fn misc(span: Span, body_id: LocalDefId) -> ObligationCause<'tcx>
pub fn dummy() -> ObligationCause<'tcx>
pub fn dummy_with_span(span: Span) -> ObligationCause<'tcx>
pub fn span(&self) -> Span
pub fn code(&self) -> &ObligationCauseCode<'tcx>
pub fn map_code( &mut self, f: impl FnOnce(InternedObligationCauseCode<'tcx>) -> ObligationCauseCode<'tcx>, )
sourcepub fn derived_cause(
self,
parent_trait_pred: Binder<TyCtxt<'tcx>, TraitPredicate<TyCtxt<'tcx>>>,
variant: impl FnOnce(DerivedCause<'tcx>) -> ObligationCauseCode<'tcx>,
) -> ObligationCause<'tcx>
pub fn derived_cause( self, parent_trait_pred: Binder<TyCtxt<'tcx>, TraitPredicate<TyCtxt<'tcx>>>, variant: impl FnOnce(DerivedCause<'tcx>) -> ObligationCauseCode<'tcx>, ) -> ObligationCause<'tcx>
Creates a cause for obligations that are derived from
obligation
by a recursive search (e.g., for a builtin
bound, or eventually a auto trait Foo
). If obligation
is itself a derived obligation, this is just a clone, but
otherwise we create a “derived obligation” cause so as to
keep track of the original root obligation for error
reporting.
pub fn to_constraint_category(&self) -> ConstraintCategory<'tcx>
Trait Implementations§
source§impl<'tcx> Clone for ObligationCause<'tcx>
impl<'tcx> Clone for ObligationCause<'tcx>
source§fn clone(&self) -> ObligationCause<'tcx>
fn clone(&self) -> ObligationCause<'tcx>
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl<'tcx> Debug for ObligationCause<'tcx>
impl<'tcx> Debug for ObligationCause<'tcx>
source§impl<'tcx, __D> Decodable<__D> for ObligationCause<'tcx>
impl<'tcx, __D> Decodable<__D> for ObligationCause<'tcx>
fn decode(__decoder: &mut __D) -> ObligationCause<'tcx>
source§impl<'tcx, __E> Encodable<__E> for ObligationCause<'tcx>
impl<'tcx, __E> Encodable<__E> for ObligationCause<'tcx>
source§impl Hash for ObligationCause<'_>
impl Hash for ObligationCause<'_>
source§impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for ObligationCause<'tcx>
impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for ObligationCause<'tcx>
fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher<SipHasher128>, )
source§impl<'tcx> PartialEq for ObligationCause<'tcx>
impl<'tcx> PartialEq for ObligationCause<'tcx>
source§impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for ObligationCause<'tcx>
impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for ObligationCause<'tcx>
source§fn try_fold_with<__F>(
self,
__folder: &mut __F,
) -> Result<ObligationCause<'tcx>, <__F as FallibleTypeFolder<TyCtxt<'tcx>>>::Error>where
__F: FallibleTypeFolder<TyCtxt<'tcx>>,
fn try_fold_with<__F>(
self,
__folder: &mut __F,
) -> Result<ObligationCause<'tcx>, <__F as FallibleTypeFolder<TyCtxt<'tcx>>>::Error>where
__F: FallibleTypeFolder<TyCtxt<'tcx>>,
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> TypeVisitable<TyCtxt<'tcx>> for ObligationCause<'tcx>
impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for ObligationCause<'tcx>
source§fn visit_with<__V>(
&self,
__visitor: &mut __V,
) -> <__V as TypeVisitor<TyCtxt<'tcx>>>::Resultwhere
__V: TypeVisitor<TyCtxt<'tcx>>,
fn visit_with<__V>(
&self,
__visitor: &mut __V,
) -> <__V as TypeVisitor<TyCtxt<'tcx>>>::Resultwhere
__V: TypeVisitor<TyCtxt<'tcx>>,
impl<'tcx> Eq for ObligationCause<'tcx>
impl<'tcx> StructuralPartialEq for ObligationCause<'tcx>
Auto Trait Implementations§
impl<'tcx> Freeze for ObligationCause<'tcx>
impl<'tcx> !RefUnwindSafe for ObligationCause<'tcx>
impl<'tcx> !Send for ObligationCause<'tcx>
impl<'tcx> !Sync for ObligationCause<'tcx>
impl<'tcx> Unpin for ObligationCause<'tcx>
impl<'tcx> !UnwindSafe for ObligationCause<'tcx>
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Size: 24 bytes