Enum SelectionError

pub enum SelectionError<'tcx> {
    Unimplemented,
    SignatureMismatch(Box<SignatureMismatchData<'tcx>>),
    TraitDynIncompatible(DefId),
    NotConstEvaluatable(NotConstEvaluatable),
    Overflow(OverflowError),
    OpaqueTypeAutoTraitLeakageUnknown(DefId),
    ConstArgHasWrongType {
        ct: Const<'tcx>,
        ct_ty: Ty<'tcx>,
        expected_ty: Ty<'tcx>,
    },
}

Variants

Unimplemented

The trait is not implemented.

SignatureMismatch(Box<SignatureMismatchData<'tcx>>)

After a closure impl has selected, its “outputs” were evaluated (which for closures includes the “input” type params) and they didn’t resolve. See confirm_poly_trait_refs for more.

TraitDynIncompatible(DefId)

The trait pointed by DefId is dyn-incompatible.

NotConstEvaluatable(NotConstEvaluatable)

A given constant couldn’t be evaluated.

Overflow(OverflowError)

Exceeded the recursion depth during type projection.

OpaqueTypeAutoTraitLeakageUnknown(DefId)

Computing an opaque type’s hidden type caused an error (e.g. a cycle error). We can thus not know whether the hidden type implements an auto trait, so we should not presume anything about it.

ConstArgHasWrongType

Error for a ConstArgHasType goal

Fields

ct: Const<'tcx>

ct_ty: Ty<'tcx>

expected_ty: Ty<'tcx>

Trait Implementations

impl<'tcx> Clone for SelectionError<'tcx>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'tcx> Debug for SelectionError<'tcx>

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

Formats the value using the given formatter.

impl<'tcx> From<OverflowError> for SelectionError<'tcx>

fn from(overflow_error: OverflowError) -> SelectionError<'tcx>

Converts to this type from the input type.

impl<'tcx> PartialEq for SelectionError<'tcx>

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for SelectionError<'tcx>

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

where __V: TypeVisitor<TyCtxt<'tcx>>,

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

impl<'tcx> Eq for SelectionError<'tcx>

impl<'tcx> StructuralPartialEq for SelectionError<'tcx>

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:

• Unimplemented: 0 bytes
• SignatureMismatch: 15 bytes
• TraitDynIncompatible: 11 bytes
• NotConstEvaluatable: 1 byte
• Overflow: 1 byte
• OpaqueTypeAutoTraitLeakageUnknown: 11 bytes
• ConstArgHasWrongType: 31 bytes