## ObligationCauseCode

# Enum ObligationCauseCode

Source

    pub enum ObligationCauseCode<'tcx> {
    Show 63 variants    Misc,
        SliceOrArrayElem,
        ArrayLen(Ty<'tcx>),
        TupleElem,
        WhereClause(DefId, Span),
        OpaqueTypeBound(Span, Option<LocalDefId>),
        WhereClauseInExpr(DefId, Span, HirId, usize),
        HostEffectInExpr(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_span: Span,
        },
        FieldSized {
            adt_kind: AdtKind,
            span: Span,
            last: bool,
        },
        SizedConstOrStatic,
        SharedStatic,
        BuiltinDerived(DerivedCause<'tcx>),
        ImplDerived(Box<ImplDerivedCause<'tcx>>),
        WellFormedDerived(DerivedCause<'tcx>),
        ImplDerivedHost(Box<ImplDerivedHostCause<'tcx>>),
        BuiltinDerivedHost(DerivedHostCause<'tcx>),
        FunctionArg {
            arg_hir_id: HirId,
            call_hir_id: HirId,
            parent_code: ObligationCauseCodeHandle<'tcx>,
        },
        CompareImplItem {
            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: Option<PatternOriginExpr>,
        },
        IfExpression {
            expr_id: HirId,
            tail_defines_return_position_impl_trait: Option<LocalDefId>,
        },
        IfExpressionWithNoElse,
        MainFunctionType,
        LangFunctionType(Symbol),
        IntrinsicType,
        LetElse,
        MethodReceiver,
        ReturnNoExpression,
        ReturnValue(HirId),
        OpaqueReturnType(Option<(Ty<'tcx>, HirId)>),
        BlockTailExpression(HirId, MatchSource),
        TrivialBound,
        AwaitableExpr(HirId),
        ForLoopIterator,
        QuestionMark,
        WellFormed(Option<WellFormedLoc>),
        MatchImpl(ObligationCause<'tcx>, DefId),
        UnOp {
            hir_id: HirId,
        },
        BinOp {
            lhs_hir_id: HirId,
            rhs_hir_id: HirId,
            rhs_span: Span,
            rhs_is_lit: bool,
            output_ty: Option<Ty<'tcx>>,
        },
        AscribeUserTypeProvePredicate(Span),
        RustCall,
        DynCompatible(Span),
        AlwaysApplicableImpl,
        ConstParam(Ty<'tcx>),
        TypeAlias(ObligationCauseCodeHandle<'tcx>, Span, DefId),
        UnsizedNonPlaceExpr(Span),
    }

## Variants§

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### Misc

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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### ArrayLen(Ty<'tcx>)

An array `[T; N]` can only be indexed (and is only well-formed if) `N` has type usize.

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### TupleElem

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

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### WhereClause(DefId, Span)

Represents a clause that comes from a specific item. The span corresponds to the clause.

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### OpaqueTypeBound(Span, Option<LocalDefId>)

Represents a bound for an opaque we are checking the well-formedness of. The def-id corresponds to a specific definition site that we found the hidden type from, if any.

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### WhereClauseInExpr(DefId, Span, HirId, usize)

Like `WhereClause`, but also identifies the expression which requires the `where` clause to be proven, and also identifies the index of the predicate in the `predicates_of` list of the item.

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### HostEffectInExpr(DefId, Span, HirId, usize)

Like `WhereClauseinExpr`, but indexes into the `const_conditions` rather than the `predicates_of`.

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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

Obligation incurred due to a coercion.

#### Fields

§`source: Ty<'tcx>`
§`target: Ty<'tcx>`
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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

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

#### 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_span: Span`

Span of the repeat element.

This is used to suggest wrapping it in a `const { ... }` block.

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### FieldSized

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

#### Fields

§`adt_kind: AdtKind`
§`span: Span`
§`last: bool`
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### SizedConstOrStatic

Constant expressions must be sized.

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### SharedStatic

`static` items must have `Sync` type.

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### BuiltinDerived(DerivedCause<'tcx>)

Derived obligation (i.e. theoretical `where` clause) on a built-in implementation like `Copy` or `Sized`.

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### ImplDerived(Box<ImplDerivedCause<'tcx>>)

Derived obligation (i.e. `where` clause) on an user-provided impl or a trait alias.

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### WellFormedDerived(DerivedCause<'tcx>)

Derived obligation for WF goals.

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### ImplDerivedHost(Box<ImplDerivedHostCause<'tcx>>)

Derived obligation (i.e. `where` clause) on an user-provided impl or a trait alias.

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### BuiltinDerivedHost(DerivedHostCause<'tcx>)

Derived obligation (i.e. `where` clause) on an user-provided impl or a trait alias.

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### FunctionArg

Derived obligation refined to point at a specific argument in a call or method expression.

#### 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: ObligationCauseCodeHandle<'tcx>`

The obligation introduced by this argument.

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### CompareImplItem

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

#### Fields

§`impl_item_def_id: LocalDefId`
§`trait_item_def_id: DefId`
§`kind: AssocKind`
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### CheckAssociatedTypeBounds

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

#### Fields

§`impl_item_def_id: LocalDefId`
§`trait_item_def_id: DefId`
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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

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

#### 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: Option<PatternOriginExpr>`

Information about the `Span`, if it came from an expression, otherwise `None`.

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### IfExpression

Computing common supertype in an if expression

#### Fields

§`expr_id: HirId`
§`tail_defines_return_position_impl_trait: Option<LocalDefId>`
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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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### 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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### ReturnNoExpression

`return` with no expression

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### ReturnValue(HirId)

`return` with an expression

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### OpaqueReturnType(Option<(Ty<'tcx>, HirId)>)

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 `Misc` 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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### UnOp

#### Fields

§`hir_id: HirId`
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### BinOp

#### Fields

§`lhs_hir_id: HirId`
§`rhs_hir_id: HirId`
§`rhs_span: 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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### DynCompatible(Span)

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### AlwaysApplicableImpl

Obligations to prove that a `Drop` or negative auto trait 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(ObligationCauseCodeHandle<'tcx>, Span, DefId)

Obligations emitted during the normalization of a free type alias.

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### UnsizedNonPlaceExpr(Span)

Only reachable if the `unsized_fn_params` feature is used. Unsized function arguments must be place expressions because we can’t store them in MIR locals as temporaries.

## Implementations§

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### impl<'tcx> ObligationCauseCode<'tcx>

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#### fn into(self) -> ObligationCauseCodeHandle<'tcx>

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### impl<'tcx> ObligationCauseCode<'tcx>

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#### pub fn peel_derives(&self) -> &Self

Returns the base obligation, ignoring derived obligations.

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#### pub fn parent(&self) -> Option<&Self>

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#### pub fn peel_derives_with_predicate( &self, ) -> (&Self, Option<PolyTraitPredicate<'tcx>>)

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

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#### pub fn parent_with_predicate( &self, ) -> Option<(&Self, Option<PolyTraitPredicate<'tcx>>)>

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#### pub fn peel_match_impls(&self) -> &Self

## Trait Implementations§

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

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

Returns a duplicate of the value. Read more
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#### 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

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

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

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### impl<'tcx, __E: TyEncoder<'tcx>> Encodable<__E> for ObligationCauseCode<'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

Tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

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: FallibleTypeFolder<TyCtxt<'tcx>>>( 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)`. Read more
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#### fn fold_with<__F: TypeFolder<TyCtxt<'tcx>>>(self, __folder: &mut __F) -> Self

The entry point for folding. To fold a value `t` with a folder `f` call: `t.fold_with(f)`. Read more
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### impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for ObligationCauseCode<'tcx>

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#### fn visit_with<__V: TypeVisitor<TyCtxt<'tcx>>>( &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)`. 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> Freeze 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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where T: Any + PartialEq,

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where T: ?Sized,

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Mutably borrows from an owned value. Read more
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where T: Clone,

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#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dest`. Read more
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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: Tcx) -> String

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This method tries to recover the query key from the given `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 compilation will treat the query as having changed instead of forcing it.
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where T: Clone,

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#### fn __clone_box(&self, _: Private) -> *mut ()

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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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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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Returns the argument unchanged.

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Instruments this type with the provided `Span`, returning an `Instrumented` wrapper. Read more
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where U: From<T>,

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Calls `U::from(self)`.

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

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Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left` is `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
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where F: FnOnce(&Self) -> bool,

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left(&self)` returns `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
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where T: TypeVisitable<TyCtxt<'tcx>> + TypeFoldable<TyCtxt<'tcx>>,

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Whether this makes sense to suggest in a diagnostic. Read more
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The alignment of pointer.
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The type for initializers.
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Initializes a with the given initializer. Read more
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Dereferences the given pointer. Read more
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Performs the conversion.
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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_aliases(&self) -> bool

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#### fn has_non_region_param(&self) -> bool

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#### fn has_infer(&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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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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True if there are any late-bound non-region variables
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True if there are any bound variables
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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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#### 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<T> ErasedDestructor for T
where T: 'static,

## 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:

- `Misc`: 0 bytes
- `SliceOrArrayElem`: 0 bytes
- `ArrayLen`: 15 bytes
- `TupleElem`: 0 bytes
- `WhereClause`: 19 bytes
- `OpaqueTypeBound`: 15 bytes
- `WhereClauseInExpr`: 39 bytes
- `HostEffectInExpr`: 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`: 11 bytes
- `FieldSized`: 11 bytes
- `SizedConstOrStatic`: 0 bytes
- `SharedStatic`: 0 bytes
- `BuiltinDerived`: 47 bytes
- `ImplDerived`: 15 bytes
- `WellFormedDerived`: 47 bytes
- `ImplDerivedHost`: 15 bytes
- `BuiltinDerivedHost`: 47 bytes
- `FunctionArg`: 31 bytes
- `CompareImplItem`: 31 bytes
- `CheckAssociatedTypeBounds`: 15 bytes
- `ExprAssignable`: 0 bytes
- `MatchExpressionArm`: 15 bytes
- `Pattern`: 47 bytes
- `IfExpression`: 15 bytes
- `IfExpressionWithNoElse`: 0 bytes
- `MainFunctionType`: 0 bytes
- `LangFunctionType`: 7 bytes
- `IntrinsicType`: 0 bytes
- `LetElse`: 0 bytes
- `MethodReceiver`: 0 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`: 23 bytes
- `MatchImpl`: 39 bytes
- `UnOp`: 11 bytes
- `BinOp`: 39 bytes
- `AscribeUserTypeProvePredicate`: 11 bytes
- `RustCall`: 0 bytes
- `DynCompatible`: 11 bytes
- `AlwaysApplicableImpl`: 0 bytes
- `ConstParam`: 15 bytes
- `TypeAlias`: 31 bytes
- `UnsizedNonPlaceExpr`: 11 bytes