Struct OpaqueHiddenType

pub struct OpaqueHiddenType<'tcx> {
    pub span: Span,
    pub ty: Ty<'tcx>,
}

Fields

span: Span

The span of this particular definition of the opaque type. So for example:

type Foo = impl Baz;
fn bar() -> Foo {
//          ^^^ This is the span we are looking for!
}

In cases where the fn returns (impl Trait, impl Trait) or other such combinations, the result is currently over-approximated, but better than nothing.

ty: Ty<'tcx>

The type variable that represents the value of the opaque type that we require. In other words, after we compile this function, we will be created a constraint like:

Foo<'a, T> = ?C

where ?C is the value of this type variable. =) It may naturally refer to the type and lifetime parameters in scope in this function, though ultimately it should only reference those that are arguments to Foo in the constraint above. (In other words, ?C should not include 'b, even though it’s a lifetime parameter on foo.)

Implementations

impl<'tcx> OpaqueHiddenType<'tcx>

pub fn build_mismatch_error( &self, other: &Self, opaque_def_id: LocalDefId, tcx: TyCtxt<'tcx>, ) -> Result<Diag<'tcx>, ErrorGuaranteed>

pub fn remap_generic_params_to_declaration_params( self, opaque_type_key: OpaqueTypeKey<'tcx>, tcx: TyCtxt<'tcx>, ignore_errors: bool, ) -> Self

Trait Implementations

impl<'tcx> Clone for OpaqueHiddenType<'tcx>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'tcx> Debug for OpaqueHiddenType<'tcx>

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

Formats the value using the given formatter.

impl<'tcx, __D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<__D> for OpaqueHiddenType<'tcx>

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

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

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

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

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

impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for OpaqueHiddenType<'tcx>

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).

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.

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

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).

impl<'tcx> Copy for OpaqueHiddenType<'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: 16 bytes