Struct rustc_middle::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: PolyTraitPredicate<'tcx>,
variant: impl FnOnce(DerivedObligationCause<'tcx>) -> ObligationCauseCode<'tcx>
) -> ObligationCause<'tcx>
pub fn derived_cause( self, parent_trait_pred: PolyTraitPredicate<'tcx>, variant: impl FnOnce(DerivedObligationCause<'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 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 )
source§impl<'tcx> PartialEq<ObligationCause<'tcx>> for ObligationCause<'tcx>
impl<'tcx> PartialEq<ObligationCause<'tcx>> for ObligationCause<'tcx>
source§fn eq(&self, other: &ObligationCause<'tcx>) -> bool
fn eq(&self, other: &ObligationCause<'tcx>) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for ObligationCause<'tcx>
impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for ObligationCause<'tcx>
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> TypeVisitable<TyCtxt<'tcx>> for ObligationCause<'tcx>
impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for ObligationCause<'tcx>
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<'tcx> Eq for ObligationCause<'tcx>
impl<'tcx> StructuralEq for ObligationCause<'tcx>
impl<'tcx> StructuralPartialEq for ObligationCause<'tcx>
Auto Trait Implementations§
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>
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<T, R> CollectAndApply<T, R> for T
impl<T, R> CollectAndApply<T, R> for T
source§impl<Tcx, T> DepNodeParams<Tcx> for Twhere
Tcx: DepContext,
T: for<'a> HashStable<StableHashingContext<'a>> + Debug,
impl<Tcx, T> DepNodeParams<Tcx> for Twhere Tcx: DepContext, T: for<'a> HashStable<StableHashingContext<'a>> + Debug,
default fn fingerprint_style() -> FingerprintStyle
source§default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint
default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint
default fn to_debug_str(&self, _: Tcx) -> String
source§default fn recover(_: Tcx, _: &DepNode) -> Option<T>
default fn recover(_: Tcx, _: &DepNode) -> Option<T>
DepNode
,
something which is needed when forcing DepNode
s during red-green
evaluation. The query system will only call this method if
fingerprint_style()
is not FingerprintStyle::Opaque
.
It is always valid to return None
here, in which case incremental
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impl<P> IntoQueryParam<P> for P
fn into_query_param(self) -> P
source§impl<'tcx, T> IsSuggestable<'tcx> for Twhere
T: TypeVisitable<TyCtxt<'tcx>> + TypeFoldable<TyCtxt<'tcx>>,
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source§impl<T> MaybeResult<T> for T
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source§impl<'tcx, T> ToPredicate<'tcx, T> for T
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fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T
source§impl<'tcx, T> TypeVisitableExt<'tcx> for Twhere
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source§fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
true
if self
has any late-bound regions that are either
bound by binder
or bound by some binder outside of binder
.
If binder
is ty::INNERMOST
, this indicates whether
there are any late-bound regions that appear free.source§fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool
fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool
true
if this type has any regions that escape binder
(and
hence are not bound by it).source§fn has_escaping_bound_vars(&self) -> bool
fn has_escaping_bound_vars(&self) -> bool
true
if this type has regions that are not a part of the type.
For example, for<'a> fn(&'a i32)
return false
, while fn(&'a i32)
would return true
. The latter can occur when traversing through the
former. Read morefn has_type_flags(&self, flags: TypeFlags) -> bool
fn has_projections(&self) -> bool
fn has_inherent_projections(&self) -> bool
fn has_opaque_types(&self) -> bool
fn has_generators(&self) -> bool
fn references_error(&self) -> bool
fn error_reported(&self) -> Result<(), ErrorGuaranteed>
fn has_non_region_param(&self) -> bool
fn has_infer_regions(&self) -> bool
fn has_infer_types(&self) -> bool
fn has_non_region_infer(&self) -> bool
fn has_infer(&self) -> bool
fn has_placeholders(&self) -> bool
fn has_non_region_placeholders(&self) -> bool
fn has_param(&self) -> bool
source§fn has_free_regions(&self) -> bool
fn has_free_regions(&self) -> bool
fn has_erased_regions(&self) -> bool
source§fn has_erasable_regions(&self) -> bool
fn has_erasable_regions(&self) -> bool
source§fn is_global(&self) -> bool
fn is_global(&self) -> bool
source§fn has_late_bound_regions(&self) -> bool
fn has_late_bound_regions(&self) -> bool
source§fn has_non_region_late_bound(&self) -> bool
fn has_non_region_late_bound(&self) -> bool
source§fn has_late_bound_vars(&self) -> bool
fn has_late_bound_vars(&self) -> bool
source§fn still_further_specializable(&self) -> bool
fn still_further_specializable(&self) -> bool
impl
specialization.source§impl<Tcx, T> Value<Tcx> for Twhere
Tcx: DepContext,
impl<Tcx, T> Value<Tcx> for Twhere Tcx: DepContext,
default fn from_cycle_error( tcx: Tcx, cycle: &[QueryInfo], _guar: ErrorGuaranteed ) -> 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: 24 bytes