Enum LayoutError

pub enum LayoutError<'tcx> {
    Unknown(Ty<'tcx>),
    SizeOverflow(Ty<'tcx>),
    TooGeneric(Ty<'tcx>),
    NormalizationFailure(Ty<'tcx>, NormalizationError<'tcx>),
    ReferencesError(ErrorGuaranteed),
    Cycle(ErrorGuaranteed),
}

Variants

Unknown(Ty<'tcx>)

A type doesn’t have a sensible layout.

This variant is used for layout errors that don’t necessarily cause compile errors.

For example, this can happen if a struct contains an unsized type in a non-tail field, but has an unsatisfiable bound like str: Sized.

SizeOverflow(Ty<'tcx>)

The size of a type exceeds TargetDataLayout::obj_size_bound.

TooGeneric(Ty<'tcx>)

The layout can vary due to a generic parameter.

Unlike Unknown, this variant is a “soft” error and indicates that the layout may become computable after further instantiating the generic parameter(s).

NormalizationFailure(Ty<'tcx>, NormalizationError<'tcx>)

An alias failed to normalize.

This variant is necessary, because, due to trait solver incompleteness, it is possible than an alias that was rigid during analysis fails to normalize after revealing opaque types.

See tests/ui/layout/normalization-failure.rs for an example.

ReferencesError(ErrorGuaranteed)

A non-layout error is reported elsewhere.

Cycle(ErrorGuaranteed)

A type has cyclic layout, i.e. the type contains itself without indirection.

Implementations

impl<'tcx> LayoutError<'tcx>

pub fn diagnostic_message(&self) -> DiagMessage

pub fn into_diagnostic(self) -> LayoutError<'tcx>

Trait Implementations

impl<'tcx> Clone for LayoutError<'tcx>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'tcx> Debug for LayoutError<'tcx>

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

Formats the value using the given formatter.

impl<'tcx, __D: TyDecoder<'tcx>> Decodable<__D> for LayoutError<'tcx>

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

impl<'tcx> Display for LayoutError<'tcx>

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

Formats the value using the given formatter.

impl<'tcx, __E: TyEncoder<'tcx>> Encodable<__E> for LayoutError<'tcx>

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

impl<'tcx> EraseType for LayoutError<'tcx>

type Result = [u8; 24]

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

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

impl<'tcx> IntoDiagArg for LayoutError<'tcx>

fn into_diag_arg(self, _: &mut Option<PathBuf>) -> DiagArgValue

Convert Self into a DiagArgValue suitable for rendering in a diagnostic.

impl<'tcx> Copy for LayoutError<'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: 24 bytes

Size for each variant:

• Unknown: 16 bytes
• SizeOverflow: 16 bytes
• TooGeneric: 16 bytes
• NormalizationFailure: 24 bytes
• ReferencesError: 0 bytes
• Cycle: 0 bytes