Enum rustc_middle::ty::error::TypeError

pub enum TypeError<'tcx> {
    Mismatch,
    ConstnessMismatch(ExpectedFound<BoundConstness>),
    PolarityMismatch(ExpectedFound<ImplPolarity>),
    UnsafetyMismatch(ExpectedFound<Unsafety>),
    AbiMismatch(ExpectedFound<Abi>),
    Mutability,
    ArgumentMutability(usize),
    TupleSize(ExpectedFound<usize>),
    FixedArraySize(ExpectedFound<u64>),
    ArgCount,
    FieldMisMatch(Symbol, Symbol),
    RegionsDoesNotOutlive(Region<'tcx>, Region<'tcx>),
    RegionsInsufficientlyPolymorphic(BoundRegionKind, Region<'tcx>),
    RegionsOverlyPolymorphic(BoundRegionKind, Region<'tcx>),
    RegionsPlaceholderMismatch,
    Sorts(ExpectedFound<Ty<'tcx>>),
    ArgumentSorts(ExpectedFound<Ty<'tcx>>, usize),
    IntMismatch(ExpectedFound<IntVarValue>),
    FloatMismatch(ExpectedFound<FloatTy>),
    Traits(ExpectedFound<DefId>),
    VariadicMismatch(ExpectedFound<bool>),
    CyclicTy(Ty<'tcx>),
    CyclicConst(Const<'tcx>),
    ProjectionMismatched(ExpectedFound<DefId>),
    ExistentialMismatch(ExpectedFound<&'tcx List<Binder<'tcx, ExistentialPredicate<'tcx>>>>),
    ObjectUnsafeCoercion(DefId),
    ConstMismatch(ExpectedFound<Const<'tcx>>),
    IntrinsicCast,
    TargetFeatureCast(DefId),
}

Variants

Mismatch

ConstnessMismatch(ExpectedFound<BoundConstness>)

PolarityMismatch(ExpectedFound<ImplPolarity>)

UnsafetyMismatch(ExpectedFound<Unsafety>)

AbiMismatch(ExpectedFound<Abi>)

Mutability

ArgumentMutability(usize)

TupleSize(ExpectedFound<usize>)

FixedArraySize(ExpectedFound<u64>)

ArgCount

FieldMisMatch(Symbol, Symbol)

RegionsDoesNotOutlive(Region<'tcx>, Region<'tcx>)

RegionsInsufficientlyPolymorphic(BoundRegionKind, Region<'tcx>)

RegionsOverlyPolymorphic(BoundRegionKind, Region<'tcx>)

RegionsPlaceholderMismatch

Sorts(ExpectedFound<Ty<'tcx>>)

ArgumentSorts(ExpectedFound<Ty<'tcx>>, usize)

IntMismatch(ExpectedFound<IntVarValue>)

FloatMismatch(ExpectedFound<FloatTy>)

Traits(ExpectedFound<DefId>)

VariadicMismatch(ExpectedFound<bool>)

CyclicTy(Ty<'tcx>)

Instantiating a type variable with the given type would have created a cycle (because it appears somewhere within that type).

CyclicConst(Const<'tcx>)

ProjectionMismatched(ExpectedFound<DefId>)

ExistentialMismatch(ExpectedFound<&'tcx List<Binder<'tcx, ExistentialPredicate<'tcx>>>>)

ObjectUnsafeCoercion(DefId)

ConstMismatch(ExpectedFound<Const<'tcx>>)

IntrinsicCast

TargetFeatureCast(DefId)

Safe #[target_feature] functions are not assignable to safe function pointers.

Implementations

impl<'tcx> TypeError<'tcx>

pub fn must_include_note(&self) -> bool

Trait Implementations

impl<'tcx> Clone for TypeError<'tcx>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'tcx> Debug for TypeError<'tcx>

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

Formats the value using the given formatter.

impl<'tcx> Display for TypeError<'tcx>

Explains the source of a type err in a short, human readable way. This is meant to be placed in parentheses after some larger message. You should also invoke note_and_explain_type_err() afterwards to present additional details, particularly when it comes to lifetime-related errors.

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

Formats the value using the given formatter.

impl<'tcx> From<TypeError<'tcx>> for NoSolution

fn from(_: TypeError<'tcx>) -> NoSolution

Converts to this type from the input type.

impl<'a, 'tcx> Lift<'tcx> for TypeError<'a>

type Lifted = TypeError<'tcx>

fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted>

impl<'tcx> TypeFoldable<'tcx> for TypeError<'tcx>

fn try_super_fold_with<__F: FallibleTypeFolder<'tcx>>(
    self,
    __folder: &mut __F
) -> Result<Self, __F::Error>

Traverses the type in question, typically by calling try_fold_with on each field/element. This is true even for types of interest such as Ty. This should only be called within TypeFolder methods, when non-custom traversals are desired for types of interest.

fn super_visit_with<__F: TypeVisitor<'tcx>>(
    &self,
    __folder: &mut __F
) -> ControlFlow<__F::BreakTy>

Traverses the type in question, typically by calling visit_with on each field/element. This is true even for types of interest such as Ty. This should only be called within TypeVisitor methods, when non-custom traversals are desired for types of interest.

fn try_fold_with<F: FallibleTypeFolder<'tcx>>(
    self,
    folder: &mut F
) -> Result<Self, F::Error>

The main entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f).

fn fold_with<F: TypeFolder<'tcx, Error = !>>(self, folder: &mut F) -> Self

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.

fn super_fold_with<F: TypeFolder<'tcx, Error = !>>(self, folder: &mut F) -> Self

A convenient alternative to try_super_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_super_fold_with.

fn visit_with<V: TypeVisitor<'tcx>>(
    &self,
    visitor: &mut V
) -> ControlFlow<V::BreakTy>

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v).

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.

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

Returns true if this self has any regions that escape binder (and hence are not bound by it).

fn has_escaping_bound_vars(&self) -> bool

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

fn has_projections(&self) -> bool

fn has_opaque_types(&self) -> bool

fn references_error(&self) -> bool

fn error_reported(&self) -> Option<ErrorGuaranteed>

fn has_param_types_or_consts(&self) -> bool

fn has_infer_regions(&self) -> bool

fn has_infer_types(&self) -> bool

fn has_infer_types_or_consts(&self) -> bool

fn needs_infer(&self) -> bool

fn has_placeholders(&self) -> bool

fn needs_subst(&self) -> bool

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.

fn has_erased_regions(&self) -> bool

fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.

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.

fn has_late_bound_regions(&self) -> bool

True if there are any late-bound regions

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.

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: 32 bytes

Size for each variant:

• Mismatch: 0 bytes
• ConstnessMismatch: 2 bytes
• PolarityMismatch: 2 bytes
• UnsafetyMismatch: 2 bytes
• AbiMismatch: 4 bytes
• Mutability: 0 bytes
• ArgumentMutability: 15 bytes
• TupleSize: 23 bytes
• FixedArraySize: 23 bytes
• ArgCount: 0 bytes
• FieldMisMatch: 11 bytes
• RegionsDoesNotOutlive: 23 bytes
• RegionsInsufficientlyPolymorphic: 31 bytes
• RegionsOverlyPolymorphic: 31 bytes
• RegionsPlaceholderMismatch: 0 bytes
• Sorts: 23 bytes
• ArgumentSorts: 31 bytes
• IntMismatch: 4 bytes
• FloatMismatch: 2 bytes
• Traits: 19 bytes
• VariadicMismatch: 2 bytes
• CyclicTy: 15 bytes
• CyclicConst: 15 bytes
• ProjectionMismatched: 19 bytes
• ExistentialMismatch: 23 bytes
• ObjectUnsafeCoercion: 11 bytes
• ConstMismatch: 23 bytes
• IntrinsicCast: 0 bytes
• TargetFeatureCast: 11 bytes