pub enum ObligationCauseCode<'tcx> {
Show 59 variants MiscObligation, SliceOrArrayElem, TupleElem, ItemObligation(DefId), BindingObligation(DefId, Span), ExprItemObligation(DefId, HirId, usize), ExprBindingObligation(DefId, Span, HirId, usize), ReferenceOutlivesReferent(Ty<'tcx>), ObjectTypeBound(Ty<'tcx>, Region<'tcx>), Coercion { source: Ty<'tcx>, target: Ty<'tcx>, }, AssignmentLhsSized, TupleInitializerSized, StructInitializerSized, VariableType(HirId), SizedArgumentType(Option<HirId>), SizedReturnType, SizedCallReturnType, SizedYieldType, InlineAsmSized, SizedClosureCapture(LocalDefId), SizedCoroutineInterior(LocalDefId), RepeatElementCopy { is_constable: IsConstable, elt_type: Ty<'tcx>, elt_span: Span, elt_stmt_span: Span, }, FieldSized { adt_kind: AdtKind, span: Span, last: bool, }, ConstSized, SharedStatic, BuiltinDerivedObligation(DerivedObligationCause<'tcx>), ImplDerivedObligation(Box<ImplDerivedObligationCause<'tcx>>), DerivedObligation(DerivedObligationCause<'tcx>), FunctionArgumentObligation { arg_hir_id: HirId, call_hir_id: HirId, parent_code: InternedObligationCauseCode<'tcx>, }, CompareImplItemObligation { impl_item_def_id: LocalDefId, trait_item_def_id: DefId, kind: AssocKind, }, CheckAssociatedTypeBounds { impl_item_def_id: LocalDefId, trait_item_def_id: DefId, }, ExprAssignable, MatchExpressionArm(Box<MatchExpressionArmCause<'tcx>>), Pattern { span: Option<Span>, root_ty: Ty<'tcx>, origin_expr: bool, }, IfExpression(Box<IfExpressionCause<'tcx>>), IfExpressionWithNoElse, MainFunctionType, StartFunctionType, LangFunctionType(Symbol), IntrinsicType, LetElse, MethodReceiver, UnifyReceiver(Box<UnifyReceiverContext<'tcx>>), ReturnNoExpression, ReturnValue(HirId), OpaqueReturnType(Option<(Ty<'tcx>, Span)>), BlockTailExpression(HirId, MatchSource), TrivialBound, AwaitableExpr(HirId), ForLoopIterator, QuestionMark, WellFormed(Option<WellFormedLoc>), MatchImpl(ObligationCause<'tcx>, DefId), BinOp { lhs_hir_id: HirId, rhs_hir_id: Option<HirId>, rhs_span: Option<Span>, rhs_is_lit: bool, output_ty: Option<Ty<'tcx>>, }, AscribeUserTypeProvePredicate(Span), RustCall, DropImpl, ConstParam(Ty<'tcx>), TypeAlias(InternedObligationCauseCode<'tcx>, Span, DefId),
}

Variants§

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MiscObligation

Not well classified or should be obvious from the span.

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SliceOrArrayElem

A slice or array is WF only if T: Sized.

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TupleElem

A tuple is WF only if its middle elements are Sized.

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ItemObligation(DefId)

Must satisfy all of the where-clause predicates of the given item.

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BindingObligation(DefId, Span)

Like ItemObligation, but carries the span of the predicate when it can be identified.

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ExprItemObligation(DefId, HirId, usize)

Like ItemObligation, but carries the HirId of the expression that caused the obligation, and the usize indicates exactly which predicate it is in the list of instantiated predicates.

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ExprBindingObligation(DefId, Span, HirId, usize)

Combines ExprItemObligation and BindingObligation.

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ReferenceOutlivesReferent(Ty<'tcx>)

A type like &'a T is WF only if T: 'a.

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ObjectTypeBound(Ty<'tcx>, Region<'tcx>)

A type like Box<Foo<'a> + 'b> is WF only if 'b: 'a.

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Coercion

Fields

§source: Ty<'tcx>
§target: Ty<'tcx>

Obligation incurred due to a coercion.

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AssignmentLhsSized

Various cases where expressions must be Sized / Copy / etc. L = X implies that L is Sized.

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TupleInitializerSized

(x1, .., xn) must be Sized.

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StructInitializerSized

S { ... } must be Sized.

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VariableType(HirId)

Type of each variable must be Sized.

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SizedArgumentType(Option<HirId>)

Argument type must be Sized.

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SizedReturnType

Return type must be Sized.

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SizedCallReturnType

Return type of a call expression must be Sized.

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SizedYieldType

Yield type must be Sized.

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InlineAsmSized

Inline asm operand type must be Sized.

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SizedClosureCapture(LocalDefId)

Captured closure type must be Sized.

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SizedCoroutineInterior(LocalDefId)

Types live across coroutine yields must be Sized.

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RepeatElementCopy

Fields

§is_constable: IsConstable

If element is a const fn or const ctor we display a help message suggesting to move it to a new const item while saying that T doesn’t implement Copy.

§elt_type: Ty<'tcx>
§elt_span: Span
§elt_stmt_span: Span

Span of the statement/item in which the repeat expression occurs. We can use this to place a const declaration before it

[expr; N] requires type_of(expr): Copy.

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FieldSized

Fields

§adt_kind: AdtKind
§span: Span
§last: bool

Types of fields (other than the last, except for packed structs) in a struct must be sized.

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ConstSized

Constant expressions must be sized.

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SharedStatic

static items must have Sync type.

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BuiltinDerivedObligation(DerivedObligationCause<'tcx>)

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ImplDerivedObligation(Box<ImplDerivedObligationCause<'tcx>>)

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DerivedObligation(DerivedObligationCause<'tcx>)

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FunctionArgumentObligation

Fields

§arg_hir_id: HirId

The node of the relevant argument in the function call.

§call_hir_id: HirId

The node of the function call.

§parent_code: InternedObligationCauseCode<'tcx>

The obligation introduced by this argument.

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CompareImplItemObligation

Fields

§impl_item_def_id: LocalDefId
§trait_item_def_id: DefId

Error derived when checking an impl item is compatible with its corresponding trait item’s definition

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CheckAssociatedTypeBounds

Fields

§impl_item_def_id: LocalDefId
§trait_item_def_id: DefId

Checking that the bounds of a trait’s associated type hold for a given impl

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ExprAssignable

Checking that this expression can be assigned to its target.

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MatchExpressionArm(Box<MatchExpressionArmCause<'tcx>>)

Computing common supertype in the arms of a match expression

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Pattern

Fields

§span: Option<Span>

The span of the scrutinee or type expression which caused the root_ty type.

§root_ty: Ty<'tcx>

The root expected type induced by a scrutinee or type expression.

§origin_expr: bool

Whether the Span came from an expression or a type expression.

Type error arising from type checking a pattern against an expected type.

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IfExpression(Box<IfExpressionCause<'tcx>>)

Computing common supertype in an if expression

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IfExpressionWithNoElse

Computing common supertype of an if expression with no else counter-part

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MainFunctionType

main has wrong type

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StartFunctionType

start has wrong type

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LangFunctionType(Symbol)

language function has wrong type

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IntrinsicType

Intrinsic has wrong type

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LetElse

A let else block does not diverge

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MethodReceiver

Method receiver

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UnifyReceiver(Box<UnifyReceiverContext<'tcx>>)

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ReturnNoExpression

return with no expression

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ReturnValue(HirId)

return with an expression

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OpaqueReturnType(Option<(Ty<'tcx>, Span)>)

Opaque return type of this function

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BlockTailExpression(HirId, MatchSource)

Block implicit return

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TrivialBound

#[feature(trivial_bounds)] is not enabled

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AwaitableExpr(HirId)

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ForLoopIterator

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QuestionMark

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WellFormed(Option<WellFormedLoc>)

Well-formed checking. If a WellFormedLoc is provided, then it will be used to perform HIR-based wf checking after an error occurs, in order to generate a more precise error span. This is purely for diagnostic purposes - it is always correct to use MiscObligation instead, or to specify WellFormed(None)

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MatchImpl(ObligationCause<'tcx>, DefId)

From match_impl. The cause for us having to match an impl, and the DefId we are matching against.

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BinOp

Fields

§lhs_hir_id: HirId
§rhs_hir_id: Option<HirId>
§rhs_span: Option<Span>
§rhs_is_lit: bool
§output_ty: Option<Ty<'tcx>>
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AscribeUserTypeProvePredicate(Span)

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RustCall

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DropImpl

Obligations to prove that a std::ops::Drop impl is not stronger than the ADT it’s being implemented for.

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ConstParam(Ty<'tcx>)

Requirement for a const N: Ty to implement Ty: ConstParamTy

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TypeAlias(InternedObligationCauseCode<'tcx>, Span, DefId)

Obligations emitted during the normalization of a weak type alias.

Implementations§

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impl<'tcx> ObligationCauseCode<'tcx>

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pub fn peel_derives(&self) -> &ObligationCauseCode<'tcx>

Returns the base obligation, ignoring derived obligations.

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pub fn peel_derives_with_predicate( &self ) -> (&ObligationCauseCode<'tcx>, Option<Binder<'tcx, TraitPredicate<'tcx>>>)

Returns the base obligation and the base trait predicate, if any, ignoring derived obligations.

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pub fn parent( &self ) -> Option<(&ObligationCauseCode<'tcx>, Option<Binder<'tcx, TraitPredicate<'tcx>>>)>

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pub fn peel_match_impls(&self) -> &ObligationCauseCode<'tcx>

Trait Implementations§

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impl<'tcx> Clone for ObligationCauseCode<'tcx>

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fn clone(&self) -> ObligationCauseCode<'tcx>

Returns a copy of the value. Read more
1.0.0 · source§

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

Performs copy-assignment from source. Read more
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impl<'tcx> Debug for ObligationCauseCode<'tcx>

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

Formats the value using the given formatter. Read more
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impl<'tcx, __D> Decodable<__D> for ObligationCauseCode<'tcx>
where __D: TyDecoder<I = TyCtxt<'tcx>>,

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impl<'tcx, __E> Encodable<__E> for ObligationCauseCode<'tcx>
where __E: TyEncoder<I = TyCtxt<'tcx>>,

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

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impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for ObligationCauseCode<'tcx>

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fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher )

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impl<'tcx> PartialEq for ObligationCauseCode<'tcx>

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fn eq(&self, other: &ObligationCauseCode<'tcx>) -> bool

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for ObligationCauseCode<'tcx>

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fn try_fold_with<__F>( self, __folder: &mut __F ) -> Result<ObligationCauseCode<'tcx>, <__F as FallibleTypeFolder<TyCtxt<'tcx>>>::Error>
where __F: FallibleTypeFolder<TyCtxt<'tcx>>,

The entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f). Read more
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fn fold_with<F>(self, folder: &mut F) -> Self
where F: TypeFolder<I>,

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.
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impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for ObligationCauseCode<'tcx>

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fn visit_with<__V>( &self, __visitor: &mut __V ) -> ControlFlow<<__V as TypeVisitor<TyCtxt<'tcx>>>::BreakTy>
where __V: TypeVisitor<TyCtxt<'tcx>>,

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v). Read more
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impl<'tcx> Eq for ObligationCauseCode<'tcx>

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impl<'tcx> StructuralPartialEq for ObligationCauseCode<'tcx>

Auto Trait Implementations§

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impl<'tcx> DynSend for ObligationCauseCode<'tcx>

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impl<'tcx> DynSync for ObligationCauseCode<'tcx>

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impl<'tcx> !RefUnwindSafe for ObligationCauseCode<'tcx>

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impl<'tcx> Send for ObligationCauseCode<'tcx>

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impl<'tcx> Sync for ObligationCauseCode<'tcx>

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impl<'tcx> Unpin for ObligationCauseCode<'tcx>

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impl<'tcx> !UnwindSafe for ObligationCauseCode<'tcx>

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> AnyEq for T
where T: Any + PartialEq,

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fn equals(&self, other: &(dyn Any + 'static)) -> bool

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fn as_any(&self) -> &(dyn Any + 'static)

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<Tcx, T> DepNodeParams<Tcx> for T
where Tcx: DepContext, T: for<'a> HashStable<StableHashingContext<'a>> + Debug,

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default fn fingerprint_style() -> FingerprintStyle

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default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint

This method turns the parameters of a DepNodeConstructor into an opaque Fingerprint to be used in DepNode. Not all DepNodeParams support being turned into a Fingerprint (they don’t need to if the corresponding DepNode is anonymous).
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default fn to_debug_str(&self, _: Tcx) -> String

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default fn recover(_: Tcx, _: &DepNode) -> Option<T>

This method tries to recover the query key from the given DepNode, something which is needed when forcing DepNodes 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 compilation will treat the query as having changed instead of forcing it.
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<P> IntoQueryParam<P> for P

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impl<'tcx, T> IsSuggestable<'tcx> for T
where T: TypeVisitable<TyCtxt<'tcx>> + TypeFoldable<TyCtxt<'tcx>>,

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fn is_suggestable(self, tcx: TyCtxt<'tcx>, infer_suggestable: bool) -> bool

Whether this makes sense to suggest in a diagnostic. Read more
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fn make_suggestable( self, tcx: TyCtxt<'tcx>, infer_suggestable: bool ) -> Option<T>

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impl<T> MaybeResult<T> for T

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type Error = !

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fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<'tcx, T> ToPredicate<'tcx, T> for T

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fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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Performs the conversion.
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impl<I, T> TypeVisitableExt<I> for T
where I: Interner, T: TypeVisitable<I>,

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fn has_type_flags(&self, flags: TypeFlags) -> bool

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fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool

Returns 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.
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fn error_reported(&self) -> Result<(), <I as Interner>::ErrorGuaranteed>

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fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool

Returns true if this type has any regions that escape binder (and hence are not bound by it).
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fn has_escaping_bound_vars(&self) -> bool

Return 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 more
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fn has_projections(&self) -> bool

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fn has_inherent_projections(&self) -> bool

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fn has_opaque_types(&self) -> bool

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fn has_coroutines(&self) -> bool

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fn references_error(&self) -> bool

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fn has_non_region_param(&self) -> bool

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fn has_infer_regions(&self) -> bool

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fn has_infer_types(&self) -> bool

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fn has_non_region_infer(&self) -> bool

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fn has_infer(&self) -> bool

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fn has_placeholders(&self) -> bool

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fn has_non_region_placeholders(&self) -> bool

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fn has_param(&self) -> bool

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fn has_free_regions(&self) -> bool

“Free” regions in this context means that it has any region that is not (a) erased or (b) late-bound.
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fn has_erased_regions(&self) -> bool

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fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.
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fn is_global(&self) -> bool

Indicates whether this value references only ‘global’ generic parameters that are the same regardless of what fn we are in. This is used for caching.
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fn has_bound_regions(&self) -> bool

True if there are any late-bound regions
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fn has_non_region_bound_vars(&self) -> bool

True if there are any late-bound non-region variables
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fn has_bound_vars(&self) -> bool

True if there are any bound variables
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fn still_further_specializable(&self) -> bool

Indicates whether this value still has parameters/placeholders/inference variables which could be replaced later, in a way that would change the results of impl specialization.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed ) -> T

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T
where T: Send + Sync,

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

Size for each variant:

  • MiscObligation: 0 bytes
  • SliceOrArrayElem: 0 bytes
  • TupleElem: 0 bytes
  • ItemObligation: 11 bytes
  • BindingObligation: 19 bytes
  • ExprItemObligation: 31 bytes
  • ExprBindingObligation: 39 bytes
  • ReferenceOutlivesReferent: 15 bytes
  • ObjectTypeBound: 23 bytes
  • Coercion: 23 bytes
  • AssignmentLhsSized: 0 bytes
  • TupleInitializerSized: 0 bytes
  • StructInitializerSized: 0 bytes
  • VariableType: 11 bytes
  • SizedArgumentType: 11 bytes
  • SizedReturnType: 0 bytes
  • SizedCallReturnType: 0 bytes
  • SizedYieldType: 0 bytes
  • InlineAsmSized: 0 bytes
  • SizedClosureCapture: 7 bytes
  • SizedCoroutineInterior: 7 bytes
  • RepeatElementCopy: 31 bytes
  • FieldSized: 11 bytes
  • ConstSized: 0 bytes
  • SharedStatic: 0 bytes
  • BuiltinDerivedObligation: 47 bytes
  • ImplDerivedObligation: 15 bytes
  • DerivedObligation: 47 bytes
  • FunctionArgumentObligation: 31 bytes
  • CompareImplItemObligation: 15 bytes
  • CheckAssociatedTypeBounds: 15 bytes
  • ExprAssignable: 0 bytes
  • MatchExpressionArm: 15 bytes
  • Pattern: 23 bytes
  • IfExpression: 15 bytes
  • IfExpressionWithNoElse: 0 bytes
  • MainFunctionType: 0 bytes
  • StartFunctionType: 0 bytes
  • LangFunctionType: 7 bytes
  • IntrinsicType: 0 bytes
  • LetElse: 0 bytes
  • MethodReceiver: 0 bytes
  • UnifyReceiver: 15 bytes
  • ReturnNoExpression: 0 bytes
  • ReturnValue: 11 bytes
  • OpaqueReturnType: 23 bytes
  • BlockTailExpression: 19 bytes
  • TrivialBound: 0 bytes
  • AwaitableExpr: 11 bytes
  • ForLoopIterator: 0 bytes
  • QuestionMark: 0 bytes
  • WellFormed: 11 bytes
  • MatchImpl: 39 bytes
  • BinOp: 39 bytes
  • AscribeUserTypeProvePredicate: 11 bytes
  • RustCall: 0 bytes
  • DropImpl: 0 bytes
  • ConstParam: 15 bytes
  • TypeAlias: 31 bytes